diff --git a/.github/workflows/npmpublish.yml b/.github/workflows/npmpublish.yml
index f2af8e7..b0b36fc 100644
--- a/.github/workflows/npmpublish.yml
+++ b/.github/workflows/npmpublish.yml
@@ -42,6 +42,8 @@ jobs:
 
       - run: npm ci
         if: steps.version-updated.outputs.has-updated
+      - run: npm run clean
+        if: steps.version-updated.outputs.has-updated
       - run: npm run build
         if: steps.version-updated.outputs.has-updated
       - run: npm publish
diff --git a/README.md b/README.md
index 2d75d55..5a4321d 100644
--- a/README.md
+++ b/README.md
@@ -13,11 +13,12 @@ A production-ready Node.js connector for the Bybit APIs and WebSockets, with Typ
 ## Issues & Discussion
 - Issues? Check the [issues tab](https://github.com/tiagosiebler/bybit-api/issues).
 - Discuss & collaborate with other node devs? Join our [Node.js Algo Traders](https://t.me/nodetraders) engineering community on telegram.
+- `'bybit-api' has no exported member 'RestClient'`: use `InverseClient` instead of `RestClient`
 
 ## Documentation
 Most methods accept JS objects. These can be populated using parameters specified by Bybit's API documentation.
 - [Bybit API Inverse Documentation](https://bybit-exchange.github.io/docs/inverse/#t-introduction).
-- [Bybit API Linear Documentation (not supported yet)](https://bybit-exchange.github.io/docs/linear/#t-introduction)
+- [Bybit API Linear Documentation](https://bybit-exchange.github.io/docs/linear/#t-introduction)
 
 ## Structure
 This project uses typescript. Resources are stored in 3 key structures:
@@ -39,13 +40,10 @@ Build a bundle using webpack:
 The bundle can be found in `dist/`. Altough usage should be largely consistent, smaller differences will exist. Documentation is still TODO.
 
 ### Inverse Contracts
-#### Rest client
-```javascript
-const { RestClient } = require('bybit-api');
+Since inverse and linear (USDT) contracts don't use the exact same APIs, the REST abstractions are split into two modules. To use the inverse REST APIs, import the `InverseClient`:
 
-const API_KEY = 'xxx';
-const PRIVATE_KEY = 'yyy';
-const useLivenet = false;
+```javascript
+const { InverseClient } = require('bybit-api');
 
 const restInverseOptions = {
   // override the max size of the request window (in ms)
@@ -68,7 +66,11 @@ const restInverseOptions = {
   parse_exceptions?: boolean;
 };
 
-const client = new RestClient(
+const API_KEY = 'xxx';
+const PRIVATE_KEY = 'yyy';
+const useLivenet = false;
+
+const client = new InverseClient(
   API_KEY,
   PRIVATE_KEY,
 
@@ -88,9 +90,67 @@ client.changeUserLeverage({leverage: 4, symbol: 'ETHUSD'})
   });
 ```
 
-See inverse [rest-client.ts](./src/rest-client.ts) for further information.
+See inverse [inverse-client.ts](./src/inverse-client.ts) for further information.
+
+### Linear Contracts
+To use the Linear (USDT) REST APIs, import the `LinearClient`:
+
+```javascript
+const { LinearClient } = require('bybit-api');
+
+const restInverseOptions = {
+  // override the max size of the request window (in ms)
+  recv_window?: number;
+
+  // how often to sync time drift with bybit servers
+  sync_interval_ms?: number | string;
+
+  // Default: false. Disable above sync mechanism if true.
+  disable_time_sync?: boolean;
+
+  // Default: false. If true, we'll throw errors if any params are undefined
+  strict_param_validation?: boolean;
+
+  // Optionally override API protocol + domain
+  // e.g 'https://api.bytick.com'
+  baseUrl?: string;
+
+  // Default: true. whether to try and post-process request exceptions.
+  parse_exceptions?: boolean;
+};
+
+const API_KEY = 'xxx';
+const PRIVATE_KEY = 'yyy';
+const useLivenet = false;
+
+const client = new LinearClient(
+  API_KEY,
+  PRIVATE_KEY,
+
+  // optional, uses testnet by default. Set to 'true' to use livenet.
+  useLivenet,
+
+  // restInverseOptions,
+  // requestLibraryOptions
+);
+
+client.changeUserLeverage({leverage: 4, symbol: 'ETHUSDT'})
+  .then(result => {
+    console.log(result);
+  })
+  .catch(err => {
+    console.error(err);
+  });
+```
+
+### WebSockets
+
+Inverse & linear WebSockets can be used via a shared `WebsocketClient`.
+
+Note: to use the linear websockets, pass "linear: true" in the constructor options when instancing the `WebsocketClient`.
+
+To connect to both linear and inverse websockets, make two instances of the WebsocketClient:
 
-#### Websocket client
 ```javascript
 const { WebsocketClient } = require('bybit-api');
 
@@ -101,67 +161,84 @@ const wsConfig = {
   key: API_KEY,
   secret: PRIVATE_KEY,
 
-  // The following parameters are optional:
+  /*
+    The following parameters are optional:
+  */
 
-  // defaults to false == testnet. set to true for livenet.
+  // defaults to false == testnet. Set to true for livenet.
   // livenet: true
 
-  // override which URL to use for websocket connections
-  // wsUrl: 'wss://stream.bytick.com/realtime'
-
-  // how often to check (in ms) that WS connection is still alive
-  // pingInterval: 10000,
+  // defaults to fase == inverse. Set to true for linear (USDT) trading.
+  // linear: true
 
   // how long to wait (in ms) before deciding the connection should be terminated & reconnected
   // pongTimeout: 1000,
 
+  // how often to check (in ms) that WS connection is still alive
+  // pingInterval: 10000,
+
   // how long to wait before attempting to reconnect (in ms) after connection is closed
   // reconnectTimeout: 500,
 
   // config options sent to RestClient (used for time sync). See RestClient docs.
   // restOptions: { },
 
-  // config for axios to pass to RestClient. E.g for proxy support
+  // config for axios used for HTTP requests. E.g for proxy support
   // requestOptions: { }
+
+  // override which URL to use for websocket connections
+  // wsUrl: 'wss://stream.bytick.com/realtime'
 };
 
 const ws = new WebsocketClient(wsConfig);
 
+// subscribe to multiple topics at once
 ws.subscribe(['position', 'execution', 'trade']);
+
+// and/or subscribe to individual topics on demand
 ws.subscribe('kline.BTCUSD.1m');
 
-ws.on('open', () => {
-  console.log('connection open');
+// Listen to events coming from websockets. This is the primary data source
+ws.on('update', data => {
+  console.log('update', data);
 });
 
-ws.on('update', message => {
-  console.log('update', message);
+// Optional: Listen to websocket connection open event (automatic after subscribing to one or more topics)
+ws.on('open', ({ wsKey, event }) => {
+  console.log('connection open for websocket with ID: ' + wsKey);
 });
 
+// Optional: Listen to responses to websocket queries (e.g. the response after subscribing to a topic)
 ws.on('response', response => {
   console.log('response', response);
 });
 
+// Optional: Listen to connection close event. Unexpected connection closes are automatically reconnected.
 ws.on('close', () => {
   console.log('connection closed');
 });
 
+// Optional: Listen to raw error events.
+// Note: responses to invalid topics are currently only sent in the "response" event.
 ws.on('error', err => {
   console.error('ERR', err);
 });
 ```
-See inverse [websocket-client.ts](./src/websocket-client.ts) for further information.
+See [websocket-client.ts](./src/websocket-client.ts) for further information.
 
 ### Customise Logging
 Pass a custom logger which supports the log methods `silly`, `debug`, `notice`, `info`, `warning` and `error`, or override methods from the default logger as desired:
 
 ```js
-const { RestClient, WebsocketClient, DefaultLogger } = require('bybit-api');
+const { WebsocketClient, DefaultLogger } = require('bybit-api');
 
 // Disable all logging on the silly level
 DefaultLogger.silly = () => {};
 
-const ws = new WebsocketClient({key: 'xxx', secret: 'yyy'}, DefaultLogger);
+const ws = new WebsocketClient(
+  { key: 'xxx', secret: 'yyy' },
+  DefaultLogger
+);
 ```
 
 ## Contributions & Thanks
diff --git a/package-lock.json b/package-lock.json
index 1c4e97c..922abff 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "bybit-api",
-  "version": "1.3.1",
+  "version": "1.3.2",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 47ac72c..98ff433 100644
--- a/package.json
+++ b/package.json
@@ -11,10 +11,11 @@
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
     "clean": "rm -rf lib dist",
-    "prebuild": "npm run clean",
     "build": "tsc",
+    "build:clean": "npm run clean && npm run build",
+    "build:watch": "npm run clean && tsc --watch",
     "pack": "webpack --config webpack/webpack.config.js",
-    "prepublish": "npm run build",
+    "prepublish": "npm run build:clean",
     "betapublish": "npm publish --tag beta"
   },
   "author": "Tiago Siebler (https://github.com/tiagosiebler)",
diff --git a/src/index.ts b/src/index.ts
index ab8ec69..bc82e2e 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,3 +1,4 @@
-export * from './rest-client';
+export * from './inverse-client';
+export * from './linear-client';
 export * from './websocket-client';
 export * from './logger';
diff --git a/src/rest-client.ts b/src/inverse-client.ts
similarity index 54%
rename from src/rest-client.ts
rename to src/inverse-client.ts
index 79b0855..405c4b1 100644
--- a/src/rest-client.ts
+++ b/src/inverse-client.ts
@@ -1,9 +1,10 @@
 import { AxiosRequestConfig } from 'axios';
-import { GenericAPIResponse, getBaseRESTInverseUrl, RestClientInverseOptions } from './util/requestUtils';
+import { GenericAPIResponse, getRestBaseUrl, RestClientOptions } from './util/requestUtils';
 import RequestWrapper from './util/requestWrapper';
+import SharedEndpoints from './shared-endpoints';
 
-export class RestClient {
-  private requestWrapper: RequestWrapper;
+export class InverseClient extends SharedEndpoints {
+  protected requestWrapper: RequestWrapper;
 
   /**
    * @public Creates an instance of the inverse REST API client.
@@ -11,22 +12,23 @@ export class RestClient {
    * @param {string} key - your API key
    * @param {string} secret - your API secret
    * @param {boolean} [useLivenet=false]
-   * @param {RestClientInverseOptions} [restInverseOptions={}] options to configure REST API connectivity
+   * @param {RestClientOptions} [restInverseOptions={}] options to configure REST API connectivity
    * @param {AxiosRequestConfig} [requestOptions={}] HTTP networking options for axios
    */
   constructor(
     key?: string | undefined,
     secret?: string | undefined,
     useLivenet?: boolean,
-    restInverseOptions: RestClientInverseOptions = {},
-    httpOptions: AxiosRequestConfig = {}
+    restInverseOptions: RestClientOptions = {},
+    requestOptions: AxiosRequestConfig = {}
   ) {
+    super()
     this.requestWrapper = new RequestWrapper(
       key,
       secret,
-      getBaseRESTInverseUrl(useLivenet),
+      getRestBaseUrl(useLivenet),
       restInverseOptions,
-      httpOptions
+      requestOptions
     );
     return this;
   }
@@ -37,12 +39,6 @@ export class RestClient {
    *
    */
 
-  getOrderBook(params: {
-    symbol: string;
-  }): GenericAPIResponse {
-    return this.requestWrapper.get('v2/public/orderBook/L2', params);
-  }
-
   getKline(params: {
     symbol: string;
     interval: string;
@@ -57,15 +53,9 @@ export class RestClient {
    */
   getLatestInformation(params?: {
     symbol?: string;
-  }): GenericAPIResponse {
+   }): GenericAPIResponse {
     return this.getTickers(params);
-  }
-
-  getTickers(params?: {
-    symbol?: string;
-  }): GenericAPIResponse {
-    return this.requestWrapper.get('v2/public/tickers', params);
-  }
+   }
 
   /**
    * @deprecated use getTrades() instead
@@ -86,10 +76,6 @@ export class RestClient {
     return this.requestWrapper.get('v2/public/trading-records', params);
   }
 
-  getSymbols(): GenericAPIResponse {
-    return this.requestWrapper.get('v2/public/symbols');
-  }
-
   /**
    * @deprecated use getLiquidations() instead
    */
@@ -103,16 +89,6 @@ export class RestClient {
     return this.getLiquidations(params);
   }
 
-  getLiquidations(params: {
-    symbol: string;
-    from?: number;
-    limit?: number;
-    start_time?: number;
-    end_time?: number;
-  }): GenericAPIResponse {
-    return this.requestWrapper.get('v2/public/liq-records', params);
-  }
-
   getMarkPriceKline(params: {
     symbol: string;
     interval: string;
@@ -122,33 +98,32 @@ export class RestClient {
     return this.requestWrapper.get('v2/public/mark-price-kline', params);
   }
 
-  getOpenInterest(params: {
+  getIndexPriceKline(params: {
     symbol: string;
-    period: string;
+    interval: string;
+    from: number;
     limit?: number;
   }): GenericAPIResponse {
-    return this.requestWrapper.get('v2/public/open-interest', params);
+    return this.requestWrapper.get('v2/public/index-price-kline', params);
   }
 
-  getLatestBigDeal(params: {
+  getPremiumIndexKline(params: {
     symbol: string;
+    interval: string;
+    from: number;
     limit?: number;
   }): GenericAPIResponse {
-    return this.requestWrapper.get('v2/public/big-deal', params);
-  }
-
-  getLongShortRatio(params: {
-    symbol: string;
-    period: string;
-    limit?: number;
-  }): GenericAPIResponse {
-    return this.requestWrapper.get('v2/public/account-ratio', params);
+    return this.requestWrapper.get('v2/public/premium-index-kline', params);
   }
 
   /**
    *
    * Account Data Endpoints
    *
+   */
+
+	/**
+   * Active orders
    */
 
   placeActiveOrder(orderRequest: {
@@ -164,9 +139,6 @@ export class RestClient {
     close_on_trigger?: boolean;
     order_link_id?: string;
   }): GenericAPIResponse {
-    // if (orderRequest.order_type === 'Limit' && !orderRequest.price) {
-    //   throw new Error('Price required for limit orders');
-    // }
     return this.requestWrapper.post('v2/private/order/create', orderRequest);
   }
 
@@ -180,29 +152,11 @@ export class RestClient {
     return this.requestWrapper.get('v2/private/order/list', params);
   }
 
-  /**
-   * @deprecated use getActiveOrderList() instead
-   */
-  getActiveOrder(params: {
-    order_id?: string;
-    order_link_id?: string;
-    symbol?: string;
-    order?: string;
-    page?: number;
-    limit?: number;
-    order_status?: string;
-  }): GenericAPIResponse {
-    return this.requestWrapper.get('open-api/order/list', params);
-  }
-
   cancelActiveOrder(params: {
     symbol: string;
     order_id?: string;
     order_link_id?: string;
   }): GenericAPIResponse {
-    // if (!params.order_id && !params.order_link_id) {
-    //   throw new Error('Parameter order_id OR order_link_id is required');
-    // }
     return this.requestWrapper.post('v2/private/order/cancel', params);
   }
 
@@ -219,33 +173,21 @@ export class RestClient {
     p_r_qty?: string;
     p_r_price?: string;
   }): GenericAPIResponse {
-    // if (!params.order_id && !params.order_link_id) {
-    //   throw new Error('Parameter order_id OR order_link_id is required');
-    // }
     return this.requestWrapper.post('v2/private/order/replace', params);
   }
 
-  /**
-   * @deprecated use replaceActiveOrder()
-   */
-  replaceActiveOrderOld(params: any): GenericAPIResponse {
-    // if (!params.order_id && !params.order_link_id) {
-    //   throw new Error('Parameter order_id OR order_link_id is required');
-    // }
-    return this.requestWrapper.post('open-api/order/replace', params);
-  }
-
   queryActiveOrder(params: {
     order_id?: string;
     order_link_id?: string;
     symbol: string;
   }): GenericAPIResponse {
-    // if (!params.order_id && !params.order_link_id) {
-    //   throw new Error('Parameter order_id OR order_link_id is required');
-    // }
     return this.requestWrapper.get('v2/private/order', params);
   }
 
+	/**
+   * Conditional orders
+   */
+
   placeConditionalOrder(params: {
     side: string;
     symbol: string;
@@ -259,22 +201,9 @@ export class RestClient {
     close_on_trigger?: boolean;
     order_link_id?: string;
   }): GenericAPIResponse {
-    // if (params.order_type === 'Limit' && !params.price) {
-    //   throw new Error('Parameter price is required for limit orders');
-    // }
     return this.requestWrapper.post('v2/private/stop-order/create', params);
   }
 
-  /**
-   * @deprecated use placeConditionalOrder
-   */
-  placeConditionalOrderOld(params: any): GenericAPIResponse {
-    // if (params.order_type === 'Limit' && !params.price) {
-    //   throw new Error('Parameter price is required for limit orders');
-    // }
-    return this.requestWrapper.post('open-api/stop-order/create', params);
-  }
-
   getConditionalOrder(params: {
     symbol: string;
     stop_order_status?: string;
@@ -285,34 +214,14 @@ export class RestClient {
     return this.requestWrapper.get('v2/private/stop-order/list', params);
   }
 
-  /**
-   * @deprecated use placeConditionalOrder
-   */
-  getConditionalOrderOld(params: any): GenericAPIResponse {
-    return this.requestWrapper.get('open-api/stop-order/list', params);
-  }
-
   cancelConditionalOrder(params: {
     symbol: string;
     stop_order_id?: string;
     order_link_id?: string;
   }): GenericAPIResponse {
-    // if (!params.stop_order_id && !params.order_link_id) {
-    //   throw new Error('Parameter stop_order_id OR order_link_id is required');
-    // }
     return this.requestWrapper.post('v2/private/stop-order/cancel', params);
   }
 
-  /**
-   * @deprecated use cancelConditionalOrder
-   */
-  cancelConditionalOrderOld(params: any): GenericAPIResponse {
-    // if (!params.stop_order_id && !params.order_link_id) {
-    //   throw new Error('Parameter stop_order_id OR order_link_id is required');
-    // }
-    return this.requestWrapper.post('open-api/stop-order/cancel', params);
-  }
-
   cancelAllConditionalOrders(params: {
     symbol: string;
   }): GenericAPIResponse {
@@ -327,30 +236,21 @@ export class RestClient {
     p_r_price?: string;
     p_r_trigger_price?: string;
   }): GenericAPIResponse {
-    // if (!params.stop_order_id && !params.order_link_id) {
-    //   throw new Error('Parameter stop_order_id OR order_link_id is required');
-    // }
     return this.requestWrapper.post('v2/private/stop-order/replace', params);
   }
 
-  /**
-   * @deprecated use replaceConditionalOrder
-   */
-  replaceConditionalOrderOld(params: any): GenericAPIResponse {
-    return this.requestWrapper.post('open-api/stop-order/replace', params);
-  }
-
   queryConditionalOrder(params: {
     symbol: string;
     stop_order_id?: string;
     order_link_id?: string;
   }): GenericAPIResponse {
-    // if (!params.stop_order_id && !params.order_link_id) {
-    //   throw new Error('Parameter stop_order_id OR order_link_id is required');
-    // }
     return this.requestWrapper.get('v2/private/stop-order', params);
   }
 
+	/**
+   * Position
+   */
+
   /**
    * @deprecated use getPosition() instead
    */
@@ -386,14 +286,14 @@ export class RestClient {
     sl_trigger_by?: string;
     new_trailing_active?: number;
   }): GenericAPIResponse {
-    return this.requestWrapper.post('open-api/position/trading-stop', params);
+    return this.requestWrapper.post('v2/private/position/trading-stop', params);
   }
 
   setUserLeverage(params: {
     symbol: string;
     leverage: number;
   }): GenericAPIResponse {
-    return this.requestWrapper.post('user/leverage/save', params);
+    return this.requestWrapper.post('v2/private/position/leverage/save', params);
   }
 
   /**
@@ -425,6 +325,10 @@ export class RestClient {
     return this.requestWrapper.get('v2/private/trade/closed-pnl/list', params);
   }
 
+	/**
+   * Risk Limit
+   */
+
   getRiskLimitList(): GenericAPIResponse {
     return this.requestWrapper.get('open-api/wallet/risk-limit/list');
   }
@@ -436,96 +340,35 @@ export class RestClient {
     return this.requestWrapper.post('open-api/wallet/risk-limit', params);
   }
 
+	/**
+   * Funding
+   */
+
   getLastFundingRate(params: {
     symbol: string;
   }): GenericAPIResponse {
-    return this.requestWrapper.get('open-api/funding/prev-funding-rate', params);
+    return this.requestWrapper.get('v2/public/funding/prev-funding-rate', params);
   }
 
   getMyLastFundingFee(params: {
     symbol: string;
   }): GenericAPIResponse {
-    return this.requestWrapper.get('open-api/funding/prev-funding', params);
+    return this.requestWrapper.get('v2/private/funding/prev-funding', params);
   }
 
   getPredictedFunding(params: {
     symbol: string;
   }): GenericAPIResponse {
-    return this.requestWrapper.get('open-api/funding/predicted-funding', params);
+    return this.requestWrapper.get('v2/private/funding/predicted-funding', params);
   }
 
-  getApiKeyInfo(): GenericAPIResponse {
-    return this.requestWrapper.get('open-api/api-key');
-  }
+	/**
+   * LCP Info
+   */
 
   getLcpInfo(params: {
     symbol: string;
   }): GenericAPIResponse {
     return this.requestWrapper.get('v2/private/account/lcp', params);
   }
-
-  /**
-   *
-   * Wallet Data Endpoints
-   *
-   */
-
-  getWalletBalance(params?: {
-    coin?: string;
-  }): GenericAPIResponse {
-    return this.requestWrapper.get('v2/private/wallet/balance', params);
-  }
-
-  getWalletFundRecords(params?: {
-    start_date?: string;
-    end_date?: string;
-    currency?: string;
-    coin?: string;
-    wallet_fund_type?: string;
-    page?: number;
-    limit?: number;
-  }): GenericAPIResponse {
-    return this.requestWrapper.get('open-api/wallet/fund/records', params);
-  }
-
-  getWithdrawRecords(params: {
-    start_date?: string;
-    end_date?: string;
-    coin?: string;
-    status?: string;
-    page?: number;
-    limit?: number;
-  }): GenericAPIResponse {
-    return this.requestWrapper.get('open-api/wallet/withdraw/list', params);
-  }
-
-  getAssetExchangeRecords(params?: {
-    limit?: number;
-    from?: number;
-    direction?: string;
-  }): GenericAPIResponse {
-    return this.requestWrapper.get('v2/private/exchange-order/list', params);
-  }
-
-  /**
-   *
-   * API Data Endpoints
-   *
-   */
-
-  getServerTime(): GenericAPIResponse {
-    return this.requestWrapper.get('v2/public/time');
-  }
-
-  getApiAnnouncements(): GenericAPIResponse {
-    return this.requestWrapper.get('v2/public/announcement');
-  }
-
-  async getTimeOffset(): Promise<number> {
-    const start = Date.now();
-    return this.getServerTime().then(result => {
-      const end = Date.now();
-      return Math.ceil((result.time_now * 1000) - end + ((end - start) / 2));
-    });
-  }
 };
diff --git a/src/linear-client.ts b/src/linear-client.ts
new file mode 100644
index 0000000..d44d6ad
--- /dev/null
+++ b/src/linear-client.ts
@@ -0,0 +1,356 @@
+import { AxiosRequestConfig } from 'axios';
+import { GenericAPIResponse, getRestBaseUrl, RestClientOptions } from './util/requestUtils';
+import RequestWrapper from './util/requestWrapper';
+import SharedEndpoints from './shared-endpoints';
+
+export class LinearClient extends SharedEndpoints {
+  protected requestWrapper: RequestWrapper;
+
+  /**
+   * @public Creates an instance of the inverse REST API client.
+   *
+   * @param {string} key - your API key
+   * @param {string} secret - your API secret
+   * @param {boolean} [useLivenet=false]
+   * @param {RestClientOptions} [restInverseOptions={}] options to configure REST API connectivity
+   * @param {AxiosRequestConfig} [requestOptions={}] HTTP networking options for axios
+   */
+  constructor(
+    key?: string | undefined,
+    secret?: string | undefined,
+    useLivenet?: boolean,
+    restInverseOptions: RestClientOptions = {},
+    requestOptions: AxiosRequestConfig = {}
+  ) {
+    super()
+    this.requestWrapper = new RequestWrapper(
+      key,
+      secret,
+      getRestBaseUrl(useLivenet),
+      restInverseOptions,
+      requestOptions
+    );
+    return this;
+  }
+
+  /**
+   *
+   * Market Data Endpoints
+   *
+   */
+
+  getKline(params: {
+    symbol: string;
+    interval: string;
+    from: number;
+    limit?: number;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('public/linear/kline', params);
+  }
+
+  getTrades(params: {
+    symbol: string;
+    limit?: number;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('public/linear/recent-trading-records', params);
+  }
+
+  getLastFundingRate(params: {
+    symbol: string;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('public/linear/funding/prev-funding-rate', params);
+  }
+
+  getMarkPriceKline(params: {
+    symbol: string;
+    interval: string;
+    from: number;
+    limit?: number;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('public/linear/mark-price-kline', params);
+  }
+
+  getIndexPriceKline(params: {
+    symbol: string;
+    interval: string;
+    from: number;
+    limit?: number;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('public/linear/index-price-kline', params);
+  }
+
+  getPremiumIndexKline(params: {
+    symbol: string;
+    interval: string;
+    from: number;
+    limit?: number;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('public/linear/premium-index-kline', params);
+  }
+
+  /**
+   *
+   * Account Data Endpoints
+   *
+   */
+
+  placeActiveOrder(params: {
+    side: string;
+    symbol: string;
+    order_type: string;
+    qty: number;
+    price?: number;
+    time_in_force: string;
+    take_profit?: number;
+    stop_loss?: number;
+    tp_trigger_by?: string;
+    sl_trigger_by?: string;
+    reduce_only?: boolean;
+    close_on_trigger?: boolean;
+    order_link_id?: string;
+  }): GenericAPIResponse {
+    return this.requestWrapper.post('private/linear/order/create', params);
+  }
+
+   getActiveOrderList(params: {
+    order_id?: string;
+    order_link_id?: string;
+    symbol: string;
+    order?: string;
+    page?: number;
+    limit?: number;
+    order_status?: string;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('private/linear/order/list', params);
+  }
+
+  cancelActiveOrder(params: {
+    symbol: string;
+    order_id?: string;
+    order_link_id?: string;
+  }): GenericAPIResponse {
+    return this.requestWrapper.post('private/linear/order/cancel', params);
+  }
+
+  cancelAllActiveOrders(params: {
+    symbol: string;
+  }): GenericAPIResponse {
+    return this.requestWrapper.post('private/linear/order/cancel-all', params);
+  }
+
+  replaceActiveOrder(params: {
+    order_id?: string;
+    order_link_id?: string;
+    symbol: string;
+    p_r_qty?: number;
+    p_r_price?: number;
+    take_profit?: number;
+    stop_loss?: number;
+    tp_trigger_by?: string;
+    sl_trigger_by?: string;
+  }): GenericAPIResponse {
+    return this.requestWrapper.post('private/linear/order/replace', params);
+  }
+
+  queryActiveOrder(params: {
+    order_id?: string;
+    order_link_id?: string;
+    symbol: string;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('private/linear/order/search', params);
+  }
+
+  /**
+  * Conditional orders
+  */
+
+  placeConditionalOrder(params: {
+    side: string;
+    symbol: string;
+    order_type: string;
+    qty: number;
+    price?: number;
+    base_price: number;
+    stop_px: number;
+    time_in_force: string;
+    trigger_by?: string;
+    close_on_trigger?: boolean;
+    order_link_id?: string;
+    reduce_only: boolean;
+    take_profit?: number;
+    stop_loss?: number;
+    tp_trigger_by?: string;
+    sl_trigger_by?: string;
+  }): GenericAPIResponse {
+    return this.requestWrapper.post('private/linear/stop-order/create', params);
+  }
+
+  getConditionalOrder(params: {
+    stop_order_id?: string;
+    order_link_id?: string;
+    symbol: string;
+    stop_order_status?: string;
+    order?: string;
+    page?: number;
+    limit?: number;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('private/linear/stop-order/list', params);
+  }
+
+  cancelConditionalOrder(params: {
+    symbol: string;
+    stop_order_id?: string;
+    order_link_id?: string;
+  }): GenericAPIResponse {
+    return this.requestWrapper.post('private/linear/stop-order/cancel', params);
+  }
+
+  cancelAllConditionalOrders(params: {
+    symbol: string;
+  }): GenericAPIResponse {
+    return this.requestWrapper.post('private/linear/stop-order/cancel-all', params);
+  }
+
+  replaceConditionalOrder(params: {
+    stop_order_id?: string;
+    order_link_id?: string;
+    symbol: string;
+    p_r_qty?: number;
+    p_r_price?: number;
+    p_r_trigger_price?: number;
+    take_profit?: number;
+    stop_loss?: number;
+    tp_trigger_by?: string;
+    sl_trigger_by?: string;
+  }): GenericAPIResponse {
+    return this.requestWrapper.post('private/linear/stop-order/replace', params);
+  }
+
+  queryConditionalOrder(params: {
+    symbol: string;
+    stop_order_id?: string;
+    order_link_id?: string;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('private/linear/stop-order/search', params);
+  }
+
+  /**
+   * Position
+   */
+
+  getPosition(params?: {
+    symbol?: string;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('private/linear/position/list', params);
+  }
+
+  setAutoAddMargin(params?: {
+    symbol: string;
+    side: string;
+    auto_add_margin: boolean;
+  }): GenericAPIResponse {
+    return this.requestWrapper.post('private/linear/position/set-auto-add-margin', params);
+  }
+
+  setMarginSwitch(params?: {
+    symbol: string;
+    is_isolated: boolean;
+    buy_leverage: number;
+    sell_leverage: number;
+  }): GenericAPIResponse {
+    return this.requestWrapper.post('private/linear/position/switch-isolated', params);
+  }
+
+  setSwitchMode(params?: {
+    symbol: string;
+    tp_sl_mode: string;
+  }): GenericAPIResponse {
+    return this.requestWrapper.post('private/linear/tpsl/switch-mode', params);
+  }
+
+  setAddReduceMargin(params?: {
+    symbol: string;
+    side: string;
+    margin: number;
+  }): GenericAPIResponse {
+    return this.requestWrapper.post('private/linear/position/add-margin', params);
+  }
+
+  setUserLeverage(params: {
+    symbol: string;
+    buy_leverage: number;
+    sell_leverage: number;
+  }): GenericAPIResponse {
+    return this.requestWrapper.post('private/linear/position/set-leverage', params);
+  }
+
+  setTradingStop(params: {
+    symbol: string;
+    side: string;
+    take_profit?: number;
+    stop_loss?: number;
+    trailing_stop?: number;
+    tp_trigger_by?: string;
+    sl_trigger_by?: string;
+    sl_size?: number;
+    tp_size?: number;
+  }): GenericAPIResponse {
+    return this.requestWrapper.post('private/linear/position/trading-stop', params);
+  }
+
+  getTradeRecords(params: {
+    symbol: string;
+    start_time?: number;
+    end_time?: number;
+    exec_type?: string;
+    page?: number;
+    limit?: number;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('private/linear/trade/execution/list', params);
+  }
+
+  getClosedPnl(params: {
+    symbol: string;
+    start_time?: number;
+    end_time?: number;
+    exec_type?: string;
+    page?: number;
+    limit?: number;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('private/linear/tpsl/switch-mode', params);
+  }
+
+  /**
+  * Risk Limit
+  */
+
+  getRiskLimitList(params: {
+    symbol: string;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('public/linear/risk-limit', params);
+  }
+
+  setRiskLimit(params: {
+    symbol: string;
+    side: string;
+    risk_id: string;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('private/linear/position/set-risk', params);
+  }
+
+  /**
+  * Funding
+  */
+
+  getPredictedFundingFee(params: {
+    symbol: string;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('private/linear/funding/predicted-funding', params);
+  }
+
+  getLastFundingFee(params: {
+    symbol: string;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('private/linear/funding/prev-funding', params);
+  }
+}
diff --git a/src/shared-endpoints.ts b/src/shared-endpoints.ts
new file mode 100644
index 0000000..1f3a9b2
--- /dev/null
+++ b/src/shared-endpoints.ts
@@ -0,0 +1,143 @@
+import { GenericAPIResponse } from './util/requestUtils';
+import RequestWrapper from './util/requestWrapper';
+
+export default class SharedEndpoints {
+  // TODO: Is there a way to say that Base has to provide this?
+  protected requestWrapper: RequestWrapper;
+
+  /**
+   *
+   * Market Data Endpoints
+   *
+   */
+
+  getOrderBook(params: {
+    symbol: string;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('v2/public/orderBook/L2', params);
+  }
+
+  getTickers(params?: {
+    symbol?: string;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('v2/public/tickers', params);
+  }
+
+  getSymbols(): GenericAPIResponse {
+    return this.requestWrapper.get('v2/public/symbols');
+  }
+
+  getLiquidations(params: {
+    symbol: string;
+    from?: number;
+    limit?: number;
+    start_time?: number;
+    end_time?: number;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('v2/public/liq-records', params);
+  }
+
+  /**
+   *
+   * Market Data : Advanced
+   *
+   */
+
+  getOpenInterest(params: {
+    symbol: string;
+    period: string;
+    limit?: number;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('v2/public/open-interest', params);
+  }
+
+  getLatestBigDeal(params: {
+    symbol: string;
+    limit?: number;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('v2/public/big-deal', params);
+  }
+
+  getLongShortRatio(params: {
+    symbol: string;
+    period: string;
+    limit?: number;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('v2/public/account-ratio', params);
+  }
+
+  /**
+   *
+   * Account Data Endpoints
+   *
+   */
+
+  getApiKeyInfo(): GenericAPIResponse {
+    return this.requestWrapper.get('v2/private/account/api-key');
+  }
+
+  /**
+   *
+   * Wallet Data Endpoints
+   *
+   */
+
+  getWalletBalance(params: {
+    coin?: string;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('v2/private/wallet/balance', params)
+  }
+
+  getWalletFundRecords(params?: {
+    start_date?: string;
+    end_date?: string;
+    currency?: string;
+    coin?: string;
+    wallet_fund_type?: string;
+    page?: number;
+    limit?: number;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('v2/private/wallet/fund/records', params);
+  }
+
+  getWithdrawRecords(params: {
+    start_date?: string;
+    end_date?: string;
+    coin?: string;
+    status?: string;
+    page?: number;
+    limit?: number;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('v2/private/wallet/withdraw/list', params);
+  }
+
+  getAssetExchangeRecords(params?: {
+    limit?: number;
+    from?: number;
+    direction?: string;
+  }): GenericAPIResponse {
+    return this.requestWrapper.get('v2/private/exchange-order/list', params);
+  }
+
+  /**
+   *
+   * API Data Endpoints
+   *
+   */
+
+  getServerTime(): GenericAPIResponse {
+    return this.requestWrapper.get('v2/public/time');
+  }
+
+  getApiAnnouncements(): GenericAPIResponse {
+    return this.requestWrapper.get('v2/public/announcement');
+  }
+
+  async getTimeOffset(): Promise<number> {
+    const start = Date.now();
+    return this.getServerTime().then(result => {
+      const end = Date.now();
+      return Math.ceil((result.time_now * 1000) - end + ((end - start) / 2));
+    });
+  }
+}
diff --git a/src/util/WsStore.ts b/src/util/WsStore.ts
new file mode 100644
index 0000000..37e2f96
--- /dev/null
+++ b/src/util/WsStore.ts
@@ -0,0 +1,124 @@
+import { WsConnectionState } from '../websocket-client';
+import { DefaultLogger } from '../logger';
+
+import WebSocket from 'isomorphic-ws';
+
+type WsTopicList = Set<string>;
+type KeyedWsTopicLists = {
+  [key: string]: WsTopicList;
+};
+
+interface WsStoredState {
+  ws?: WebSocket;
+  connectionState?: WsConnectionState;
+  activePingTimer?: NodeJS.Timeout | undefined;
+  activePongTimer?: NodeJS.Timeout | undefined;
+  subscribedTopics: WsTopicList;
+};
+
+export default class WsStore {
+  private wsState: {
+    [key: string]: WsStoredState;
+  }
+  private logger: typeof DefaultLogger;
+
+  constructor(logger: typeof DefaultLogger) {
+    this.logger = logger || DefaultLogger;
+    this.wsState = {};
+  }
+
+  get(key: string, createIfMissing?: boolean): WsStoredState | undefined {
+    if (this.wsState[key]) {
+      return this.wsState[key];
+    }
+
+    if (createIfMissing) {
+      return this.create(key);
+    }
+
+    return undefined;
+  }
+
+  getKeys(): string[] {
+    return Object.keys(this.wsState);
+  }
+
+  create(key: string): WsStoredState | undefined {
+    if (this.hasExistingActiveConnection(key)) {
+      this.logger.warning('WsStore setConnection() overwriting existing open connection: ', this.getWs(key));
+    }
+    this.wsState[key] = {
+      subscribedTopics: new Set(),
+      connectionState: WsConnectionState.READY_STATE_INITIAL
+    };
+    return this.get(key);
+  }
+
+  delete(key: string) {
+    if (this.hasExistingActiveConnection(key)) {
+      const ws = this.getWs(key);
+      this.logger.warning('WsStore deleting state for connection still open: ', ws);
+      ws?.close();
+    }
+    delete this.wsState[key];
+  }
+
+  /* connection websocket */
+
+  hasExistingActiveConnection(key) {
+    return this.get(key) && this.isWsOpen(key);
+  }
+
+  getWs(key: string): WebSocket | undefined {
+    return this.get(key)?.ws;
+  }
+
+  setWs(key: string, wsConnection: WebSocket): WebSocket {
+    if (this.isWsOpen(key)) {
+      this.logger.warning('WsStore setConnection() overwriting existing open connection: ', this.getWs(key));
+    }
+    this.get(key, true)!.ws = wsConnection;
+    return wsConnection;
+  }
+
+  /* connection state */
+
+  isWsOpen(key: string): boolean {
+    const existingConnection = this.getWs(key);
+    return !!existingConnection && existingConnection.readyState === existingConnection.OPEN;
+  }
+
+  getConnectionState(key: string): WsConnectionState {
+    return this.get(key, true)!.connectionState!;
+  }
+
+  setConnectionState(key: string, state: WsConnectionState) {
+    this.get(key, true)!.connectionState = state;
+  }
+
+  isConnectionState(key: string, state: WsConnectionState): boolean {
+    return this.getConnectionState(key) === state;
+  }
+
+  /* subscribed topics */
+
+  getTopics(key: string): WsTopicList {
+    return this.get(key, true)!.subscribedTopics;
+  }
+
+  getTopicsByKey(): KeyedWsTopicLists {
+    const result = {};
+    for (const refKey in this.wsState) {
+      result[refKey] = this.getTopics(refKey);
+    }
+    return result;
+  }
+
+  addTopic(key: string, topic: string) {
+    return this.getTopics(key).add(topic);
+  }
+
+  deleteTopic(key: string, topic: string) {
+    return this.getTopics(key).delete(topic);
+  }
+}
\ No newline at end of file
diff --git a/src/util/requestUtils.ts b/src/util/requestUtils.ts
index b5f5761..903a7a2 100644
--- a/src/util/requestUtils.ts
+++ b/src/util/requestUtils.ts
@@ -1,6 +1,6 @@
 import { createHmac } from 'crypto';
 
-export interface RestClientInverseOptions {
+export interface RestClientOptions {
   // override the max size of the request window (in ms)
   recv_window?: number;
 
@@ -42,7 +42,7 @@ export function serializeParams(params: object = {}, strict_validation = false):
     .join('&');
 };
 
-export function getBaseRESTInverseUrl(useLivenet?: boolean, restInverseOptions?: RestClientInverseOptions) {
+export function getRestBaseUrl(useLivenet?: boolean, restInverseOptions?: RestClientOptions) {
   const baseUrlsInverse = {
     livenet: 'https://api.bybit.com',
     testnet: 'https://api-testnet.bybit.com'
@@ -56,4 +56,23 @@ export function getBaseRESTInverseUrl(useLivenet?: boolean, restInverseOptions?:
     return baseUrlsInverse.livenet;
   }
   return baseUrlsInverse.testnet;
+}
+
+export function isPublicEndpoint (endpoint: string): boolean {
+  if (endpoint.startsWith('v2/public')) {
+    return true;
+  }
+  if (endpoint.startsWith('public/linear')) {
+    return true;
+  }
+  return false;
+}
+
+export function isWsPong(response: any) {
+  return (
+    response.request &&
+    response.request.op === 'ping' &&
+    response.ret_msg === 'pong' &&
+    response.success === true
+  );
 }
\ No newline at end of file
diff --git a/src/util/requestWrapper.ts b/src/util/requestWrapper.ts
index cf5c71c..e19f8f3 100644
--- a/src/util/requestWrapper.ts
+++ b/src/util/requestWrapper.ts
@@ -1,11 +1,11 @@
 import axios, { AxiosRequestConfig, AxiosResponse, Method } from 'axios';
 
-import { signMessage, serializeParams, RestClientInverseOptions, GenericAPIResponse } from './requestUtils';
+import { signMessage, serializeParams, RestClientOptions, GenericAPIResponse, isPublicEndpoint } from './requestUtils';
 
 export default class RequestUtil {
   private timeOffset: number | null;
   private syncTimePromise: null | Promise<any>;
-  private options: RestClientInverseOptions;
+  private options: RestClientOptions;
   private baseUrl: string;
   private globalRequestOptions: AxiosRequestConfig;
   private key: string | undefined;
@@ -15,7 +15,7 @@ export default class RequestUtil {
     key: string | undefined,
     secret: string | undefined,
     baseUrl: string,
-    options: RestClientInverseOptions = {},
+    options: RestClientOptions = {},
     requestOptions: AxiosRequestConfig = {}
   ) {
     this.timeOffset = null;
@@ -68,9 +68,7 @@ export default class RequestUtil {
    * @private Make a HTTP request to a specific endpoint. Private endpoints are automatically signed.
    */
   async _call(method: Method, endpoint: string, params?: any): GenericAPIResponse {
-    const publicEndpoint = endpoint.startsWith('v2/public');
-
-    if (!publicEndpoint) {
+    if (!isPublicEndpoint(endpoint)) {
       if (!this.key || !this.secret) {
         throw new Error('Private endpoints require api and private keys set');
       }
diff --git a/src/websocket-client.ts b/src/websocket-client.ts
index 8b80c80..7e23e42 100644
--- a/src/websocket-client.ts
+++ b/src/websocket-client.ts
@@ -1,27 +1,51 @@
 import { EventEmitter } from 'events';
-
-import { RestClient } from './rest-client';
+import { InverseClient } from './inverse-client';
+import { LinearClient } from './linear-client';
 import { DefaultLogger } from './logger';
-import { signMessage, serializeParams } from './util/requestUtils';
-// import WebSocket from 'ws';
-import WebSocket from 'isomorphic-ws';
+import { signMessage, serializeParams, isWsPong } from './util/requestUtils';
 
-const wsUrls = {
+import WebSocket from 'isomorphic-ws';
+import WsStore from './util/WsStore';
+
+const inverseEndpoints = {
   livenet: 'wss://stream.bybit.com/realtime',
   testnet: 'wss://stream-testnet.bybit.com/realtime'
 };
 
+const linearEndpoints = {
+  private: {
+    livenet: 'wss://stream.bybit.com/realtime_private',
+    livenet2: 'wss://stream.bytick.com/realtime_public',
+    testnet: 'wss://stream-testnet.bybit.com/realtime_private'
+  },
+  public: {
+    livenet: 'wss://stream.bybit.com/realtime_public',
+    livenet2: 'wss://stream.bytick.com/realtime_private',
+    testnet: 'wss://stream-testnet.bybit.com/realtime_public'
+  }
+};
+
+const loggerCategory = { category: 'bybit-ws' };
+
 const READY_STATE_INITIAL = 0;
 const READY_STATE_CONNECTING = 1;
 const READY_STATE_CONNECTED = 2;
 const READY_STATE_CLOSING = 3;
 const READY_STATE_RECONNECTING = 4;
 
-export interface WebsocketClientOptions {
+export enum WsConnectionState {
+  READY_STATE_INITIAL,
+  READY_STATE_CONNECTING,
+  READY_STATE_CONNECTED,
+  READY_STATE_CLOSING,
+  READY_STATE_RECONNECTING
+};
+
+export interface WSClientConfigurableOptions {
   key?: string;
   secret?: string;
   livenet?: boolean;
-
+  linear?: boolean;
   pongTimeout?: number;
   pingInterval?: number;
   reconnectTimeout?: number;
@@ -30,231 +54,400 @@ export interface WebsocketClientOptions {
   wsUrl?: string;
 };
 
-type Logger = typeof DefaultLogger;
+export interface WebsocketClientOptions extends WSClientConfigurableOptions {
+  livenet: boolean;
+  linear: boolean;
+  pongTimeout: number;
+  pingInterval: number;
+  reconnectTimeout: number;
+};
+
+export const wsKeyInverse = 'inverse';
+export const wsKeyLinearPrivate = 'linearPrivate';
+export const wsKeyLinearPublic = 'linearPublic';
+
+const getLinearWsKeyForTopic = (topic: string) => {
+  const privateLinearTopics = ['position', 'execution', 'order', 'stop_order', 'wallet'];
+  if (privateLinearTopics.includes(topic)) {
+    return wsKeyLinearPrivate;
+  }
+
+  return wsKeyLinearPublic;
+}
+
+export declare interface WebsocketClient {
+  on(event: 'open' | 'reconnected', listener: ({ wsKey: string, event: any }) => void): this;
+  on(event: 'response' | 'update' | 'error', listener: (response: any) => void): this;
+  on(event: 'reconnect' | 'close', listener: () => void): this;
+}
 
 export class WebsocketClient extends EventEmitter {
-  private logger: Logger;
-  private readyState: number;
-  private pingInterval?: number | undefined;
-  private pongTimeout?: number | undefined;
-  private client: RestClient;
-  private _subscriptions: Set<unknown>;
-  private ws: WebSocket;
+  private logger: typeof DefaultLogger;
+  private restClient: InverseClient | LinearClient;
   private options: WebsocketClientOptions;
+  private wsStore: WsStore;
 
-  constructor(options: WebsocketClientOptions, logger?: Logger) {
+  constructor(options: WSClientConfigurableOptions, logger?: typeof DefaultLogger) {
     super();
 
     this.logger = logger || DefaultLogger;
-
-    this.readyState = READY_STATE_INITIAL;
-    this.pingInterval = undefined;
-    this.pongTimeout = undefined;
+    this.wsStore = new WsStore(this.logger);
 
     this.options = {
       livenet: false,
+      linear: false,
       pongTimeout: 1000,
       pingInterval: 10000,
       reconnectTimeout: 500,
       ...options
     };
 
-    this.client = new RestClient(undefined, undefined, this.options.livenet, this.options.restOptions, this.options.requestOptions);
-    this._subscriptions = new Set();
-
-    this._connect();
-  }
-
-  subscribe(topics) {
-    if (!Array.isArray(topics)) topics = [topics];
-    topics.forEach(topic => this._subscriptions.add(topic));
-
-    // subscribe not necessary if not yet connected (will subscribe onOpen)
-    if (this.readyState === READY_STATE_CONNECTED) this._subscribe(topics);
-  }
-
-  unsubscribe(topics) {
-    if (!Array.isArray(topics)) topics = [topics];
-
-    topics.forEach(topic => this._subscriptions.delete(topic));
-
-    // unsubscribe not necessary if not yet connected
-    if (this.readyState === READY_STATE_CONNECTED) this._unsubscribe(topics);
-  }
-
-  close() {
-    this.logger.info('Closing connection', {category: 'bybit-ws'});
-    this.readyState = READY_STATE_CLOSING;
-    this._teardown();
-    this.ws && this.ws.close();
-  }
-
-  _getWsUrl() {
-    if (this.options.wsUrl) {
-      return this.options.wsUrl;
+    if (this.isLinear()) {
+      this.restClient = new LinearClient(undefined, undefined, this.isLivenet(), this.options.restOptions, this.options.requestOptions);
+    } else {
+      this.restClient = new InverseClient(undefined, undefined, this.isLivenet(), this.options.restOptions, this.options.requestOptions);
     }
-    return wsUrls[this.options.livenet ? 'livenet' : 'testnet'];
   }
 
-  async _connect() {
+  public isLivenet(): boolean {
+    return this.options.livenet === true;
+  }
+
+  public isLinear(): boolean {
+    return this.options.linear === true;
+  }
+
+  public isInverse(): boolean {
+    return !this.isLinear();
+  }
+
+  /**
+   * Add topic/topics to WS subscription list
+   */
+  public subscribe(wsTopics: string[] | string) {
+    const topics = Array.isArray(wsTopics) ? wsTopics : [wsTopics];
+    topics.forEach(topic => this.wsStore.addTopic(
+      this.getWsKeyForTopic(topic),
+      topic
+    ));
+
+    // attempt to send subscription topic per websocket
+    this.wsStore.getKeys().forEach(wsKey => {
+      // if connected, send subscription request
+      if (this.wsStore.isConnectionState(wsKey, READY_STATE_CONNECTED)) {
+        return this.requestSubscribeTopics(wsKey, [...this.wsStore.getTopics(wsKey)]);
+      }
+
+      // start connection process if it hasn't yet begun. Topics are automatically subscribed to on-connect
+      if (
+        !this.wsStore.isConnectionState(wsKey, READY_STATE_CONNECTING) &&
+        !this.wsStore.isConnectionState(wsKey, READY_STATE_RECONNECTING)
+      ) {
+        return this.connect(wsKey);
+      }
+    });
+  }
+
+  /**
+   * Remove topic/topics from WS subscription list
+   */
+  public unsubscribe(wsTopics: string[] | string) {
+    const topics = Array.isArray(wsTopics) ? wsTopics : [wsTopics];
+    topics.forEach(topic => this.wsStore.deleteTopic(
+      this.getWsKeyForTopic(topic),
+      topic
+    ));
+
+    this.wsStore.getKeys().forEach(wsKey => {
+      // unsubscribe request only necessary if active connection exists
+      if (this.wsStore.isConnectionState(wsKey, READY_STATE_CONNECTED)) {
+        this.requestUnsubscribeTopics(wsKey, [...this.wsStore.getTopics(wsKey)])
+      }
+    });
+  }
+
+  public close(wsKey: string) {
+    this.logger.info('Closing connection', { ...loggerCategory, wsKey });
+    this.setWsState(wsKey, READY_STATE_CLOSING);
+    this.clearTimers(wsKey);
+
+    this.getWs(wsKey)?.close();
+  }
+
+  /**
+   * Request connection of all dependent websockets, instead of waiting for automatic connection by library
+   */
+  public connectAll(): Promise<WebSocket | undefined>[] | undefined {
+    if (this.isInverse()) {
+      return [this.connect(wsKeyInverse)];
+    }
+
+    if (this.isLinear()) {
+      return [this.connect(wsKeyLinearPublic), this.connect(wsKeyLinearPrivate)];
+    }
+  }
+
+  private async connect(wsKey: string): Promise<WebSocket | undefined> {
     try {
-      if (this.readyState === READY_STATE_INITIAL) this.readyState = READY_STATE_CONNECTING;
+      if (this.wsStore.isWsOpen(wsKey)) {
+        this.logger.error('Refused to connect to ws with existing active connection', { ...loggerCategory, wsKey })
+        return this.wsStore.getWs(wsKey);
+      }
 
-      const authParams = await this._authenticate();
-      const url = this._getWsUrl() + authParams;
+      if (this.wsStore.isConnectionState(wsKey, READY_STATE_CONNECTING)) {
+        this.logger.error('Refused to connect to ws, connection attempt already active', { ...loggerCategory, wsKey })
+        return;
+      }
 
-      const ws = new WebSocket(url);
+      if (
+        !this.wsStore.getConnectionState(wsKey) ||
+        this.wsStore.isConnectionState(wsKey, READY_STATE_INITIAL)
+      ) {
+        this.setWsState(wsKey, READY_STATE_CONNECTING);
+      }
 
-      ws.onopen = this._wsOpenHandler.bind(this);
-      ws.onmessage = this._wsMessageHandler.bind(this);
-      ws.onerror = this._wsOnErrorHandler.bind(this);
-      ws.onclose = this._wsCloseHandler.bind(this);
-
-      this.ws = ws;
+      const authParams = await this.getAuthParams(wsKey);
+      const url = this.getWsUrl(wsKey) + authParams;
+      const ws = this.connectToWsUrl(url, wsKey);
 
+      return this.wsStore.setWs(wsKey, ws);
     } catch (err) {
-      this.logger.error('Connection failed: ', err);
-      this._reconnect(this.options.reconnectTimeout);
+      this.parseWsError('Connection failed', err, wsKey);
+      this.reconnectWithDelay(wsKey, this.options.reconnectTimeout!);
     }
   }
 
-  async _authenticate() {
-    if (this.options.key && this.options.secret) {
-      this.logger.debug('Starting authenticated websocket client.', {category: 'bybit-ws'});
+  private parseWsError(context: string, error, wsKey: string) {
+    if (!error.message) {
+      this.logger.error(`${context} due to unexpected error: `, error);
+      return;
+    }
 
-      const timeOffset = await this.client.getTimeOffset();
+    switch (error.message) {
+      case 'Unexpected server response: 401':
+        this.logger.error(`${context} due to 401 authorization failure.`, { ...loggerCategory, wsKey });
+        break;
+
+      default:
+        this.logger.error(`{context} due to unexpected response error: ${error.msg}`, { ...loggerCategory, wsKey });
+        break;
+    }
+  }
+
+  /**
+   * Return params required to make authorized request
+   */
+  private async getAuthParams(wsKey: string): Promise<string> {
+    const { key, secret } = this.options;
+
+    if (key && secret && wsKey !== wsKeyLinearPublic) {
+      this.logger.debug('Getting auth\'d request params', { ...loggerCategory, wsKey });
+
+      const timeOffset = await this.restClient.getTimeOffset();
 
       const params: any = {
         api_key: this.options.key,
         expires: (Date.now() + timeOffset + 5000)
       };
 
-      params.signature = signMessage('GET/realtime' + params.expires, this.options.secret);
+      params.signature = signMessage('GET/realtime' + params.expires, secret);
       return '?' + serializeParams(params);
 
-    } else if (this.options.key || this.options.secret) {
-      this.logger.warning('Could not authenticate websocket, either api key or private key missing.', { category: 'bybit-ws' });
+    } else if (!key || !secret) {
+      this.logger.warning('Connot authenticate websocket, either api or private keys missing.', { ...loggerCategory, wsKey });
     } else {
-      this.logger.debug('Starting public only websocket client.', { category: 'bybit-ws' });
+      this.logger.debug('Starting public only websocket client.', { ...loggerCategory, wsKey });
     }
 
-    return  '';
+    return '';
   }
 
-  _reconnect(timeout) {
-    this._teardown();
-    if (this.readyState !== READY_STATE_CONNECTING) {
-      this.readyState = READY_STATE_RECONNECTING;
+  private reconnectWithDelay(wsKey: string, connectionDelayMs: number) {
+    this.clearTimers(wsKey);
+    if (this.wsStore.getConnectionState(wsKey) !== READY_STATE_CONNECTING) {
+      this.setWsState(wsKey, READY_STATE_RECONNECTING);
     }
 
     setTimeout(() => {
-      this.logger.info('Reconnecting to server', { category: 'bybit-ws' });
-
-      this._connect();
-    }, timeout);
+      this.logger.info('Reconnecting to websocket', { ...loggerCategory, wsKey });
+      this.connect(wsKey);
+    }, connectionDelayMs);
   }
 
-  _ping() {
-    clearTimeout(this.pongTimeout!);
-    delete this.pongTimeout;
+  private ping(wsKey: string) {
+    this.clearPongTimer(wsKey);
 
-    this.logger.silly('Sending ping', { category: 'bybit-ws' });
-    this.ws.send(JSON.stringify({op: 'ping'}));
+    this.logger.silly('Sending ping', { ...loggerCategory, wsKey });
+    this.tryWsSend(wsKey, JSON.stringify({ op: 'ping' }));
 
-    this.pongTimeout = setTimeout(() => {
-      this.logger.info('Pong timeout', { category: 'bybit-ws' });
-      this._teardown();
-      // this.ws.terminate();
-      // TODO: does this work?
-      this.ws.close();
+    this.wsStore.get(wsKey, true)!.activePongTimer = setTimeout(() => {
+      this.logger.info('Pong timeout - closing socket to reconnect', { ...loggerCategory, wsKey });
+      this.getWs(wsKey)?.close();
     }, this.options.pongTimeout);
   }
 
-  _teardown() {
-    if (this.pingInterval) clearInterval(this.pingInterval);
-    if (this.pongTimeout) clearTimeout(this.pongTimeout);
-
-    this.pongTimeout = undefined;
-    this.pingInterval = undefined;
+  private clearTimers(wsKey: string) {
+    this.clearPingTimer(wsKey);
+    this.clearPongTimer(wsKey);
   }
 
-  _wsOpenHandler() {
-    if (this.readyState === READY_STATE_CONNECTING) {
-      this.logger.info('Websocket connected', { category: 'bybit-ws', livenet: this.options.livenet });
-      this.emit('open');
-    } else if (this.readyState === READY_STATE_RECONNECTING) {
-      this.logger.info('Websocket reconnected', { category: 'bybit-ws', livenet: this.options.livenet });
-      this.emit('reconnected');
+  // Send a ping at intervals
+  private clearPingTimer(wsKey: string) {
+    const wsState = this.wsStore.get(wsKey);
+    if (wsState?.activePingTimer) {
+      clearInterval(wsState.activePingTimer);
+      wsState.activePingTimer = undefined;
+    }
+  }
+
+  // Expect a pong within a time limit
+  private clearPongTimer(wsKey: string) {
+    const wsState = this.wsStore.get(wsKey);
+    if (wsState?.activePongTimer) {
+      clearTimeout(wsState.activePongTimer);
+      wsState.activePongTimer = undefined;
+    }
+  }
+
+  /**
+   * Send WS message to subscribe to topics.
+   */
+  private requestSubscribeTopics(wsKey: string, topics: string[]) {
+    const wsMessage = JSON.stringify({
+      op: 'subscribe',
+      args: topics
+    });
+
+    this.tryWsSend(wsKey, wsMessage);
+  }
+
+  /**
+   * Send WS message to unsubscribe from topics.
+   */
+  private requestUnsubscribeTopics(wsKey: string, topics: string[]) {
+    const wsMessage = JSON.stringify({
+      op: 'unsubscribe',
+      args: topics
+    });
+
+    this.tryWsSend(wsKey, wsMessage);
+  }
+
+  private tryWsSend(wsKey: string, wsMessage: string) {
+    try {
+      this.logger.silly(`Sending upstream ws message: `, { ...loggerCategory, wsMessage, wsKey });
+      if (!wsKey) {
+        throw new Error('Cannot send message due to no known websocket for this wsKey');
+      }
+      this.getWs(wsKey)?.send(wsMessage);
+    } catch (e) {
+      this.logger.error(`Failed to send WS message`, { ...loggerCategory, wsMessage, wsKey, exception: e });
+    }
+  }
+
+  private connectToWsUrl(url: string, wsKey: string): WebSocket {
+    this.logger.silly(`Opening WS connection to URL: ${url}`, { ...loggerCategory, wsKey })
+
+    const ws = new WebSocket(url);
+    ws.onopen = event => this.onWsOpen(event, wsKey);
+    ws.onmessage = event => this.onWsMessage(event, wsKey);
+    ws.onerror = event => this.onWsError(event, wsKey);
+    ws.onclose = event => this.onWsClose(event, wsKey);
+
+    return ws;
+  }
+
+  private onWsOpen(event, wsKey: string) {
+    if (this.wsStore.isConnectionState(wsKey, READY_STATE_CONNECTING)) {
+      this.logger.info('Websocket connected', { ...loggerCategory, wsKey, livenet: this.isLivenet(), linear: this.isLinear() });
+      this.emit('open', { wsKey, event });
+    } else if (this.wsStore.isConnectionState(wsKey, READY_STATE_RECONNECTING)) {
+      this.logger.info('Websocket reconnected', { ...loggerCategory, wsKey });
+      this.emit('reconnected', { wsKey, event });
     }
 
-    this.readyState = READY_STATE_CONNECTED;
+    this.setWsState(wsKey, READY_STATE_CONNECTED);
 
-    this._subscribe([...this._subscriptions]);
-    this.pingInterval = setInterval(this._ping.bind(this), this.options.pingInterval);
+    this.requestSubscribeTopics(wsKey, [...this.wsStore.getTopics(wsKey)]);
+
+    this.wsStore.get(wsKey, true)!.activePingTimer = setInterval(
+      () => this.ping(wsKey),
+      this.options.pingInterval
+    );
   }
 
-  _wsMessageHandler(message) {
-    const msg = JSON.parse(message && message.data || message);
+  private onWsMessage(event, wsKey: string) {
+    const msg = JSON.parse(event && event.data || event);
 
     if ('success' in msg) {
-      this._handleResponse(msg);
+      this.onWsMessageResponse(msg, wsKey);
     } else if (msg.topic) {
-      this._handleUpdate(msg);
+      this.onWsMessageUpdate(msg);
     } else {
-      this.logger.warning('Got unhandled ws message', msg);
+      this.logger.warning('Got unhandled ws message', { ...loggerCategory, message: msg, event, wsKey});
     }
   }
 
-  _wsOnErrorHandler(err) {
-    this.logger.error('Websocket error', {category: 'bybit-ws', err});
-    if (this.readyState === READY_STATE_CONNECTED) this.emit('error', err);
+  private onWsError(err, wsKey: string) {
+    this.parseWsError('Websocket error', err, wsKey);
+    if (this.wsStore.isConnectionState(wsKey, READY_STATE_CONNECTED)) {
+      this.emit('error', err);
+    }
   }
 
-  _wsCloseHandler() {
-    this.logger.info('Websocket connection closed', {category: 'bybit-ws'});
+  private onWsClose(event, wsKey: string) {
+    this.logger.info('Websocket connection closed', { ...loggerCategory, wsKey});
 
-    if (this.readyState !== READY_STATE_CLOSING) {
-      this._reconnect(this.options.reconnectTimeout);
+    if (this.wsStore.getConnectionState(wsKey) !== READY_STATE_CLOSING) {
+      this.reconnectWithDelay(wsKey, this.options.reconnectTimeout!);
       this.emit('reconnect');
     } else {
-      this.readyState = READY_STATE_INITIAL;
+      this.setWsState(wsKey, READY_STATE_INITIAL);
       this.emit('close');
     }
   }
 
-  _handleResponse(response) {
-    if (
-      response.request &&
-      response.request.op === 'ping' &&
-      response.ret_msg === 'pong' &&
-      response.success === true
-    ) {
-        this.logger.silly('pong recieved', {category: 'bybit-ws'});
-        clearTimeout(this.pongTimeout);
+  private onWsMessageResponse(response: any, wsKey: string) {
+    if (isWsPong(response)) {
+      this.logger.silly('Received pong', { ...loggerCategory, wsKey });
+      this.clearPongTimer(wsKey);
     } else {
       this.emit('response', response);
     }
   }
 
-  _handleUpdate(message) {
+  private onWsMessageUpdate(message: any) {
     this.emit('update', message);
   }
 
-  _subscribe(topics) {
-    const msgStr = JSON.stringify({
-      op: 'subscribe',
-      'args': topics
-    });
-
-    this.ws.send(msgStr);
+  private getWs(wsKey: string) {
+    return this.wsStore.getWs(wsKey);
   }
 
-  _unsubscribe(topics) {
-    const msgStr = JSON.stringify({
-      op: 'unsubscribe',
-      'args': topics
-    });
+  private setWsState(wsKey: string, state: WsConnectionState) {
+    this.wsStore.setConnectionState(wsKey, state);
+  }
 
-    this.ws.send(msgStr);
+  private getWsUrl(wsKey: string): string {
+    if (this.options.wsUrl) {
+      return this.options.wsUrl;
+    }
+
+    const networkKey = this.options.livenet ? 'livenet' : 'testnet';
+    if (this.isLinear() || wsKey.startsWith('linear')){
+      if (wsKey === wsKeyLinearPublic) {
+        return linearEndpoints.public[networkKey];
+      }
+      if (wsKey === wsKeyLinearPrivate) {
+        return linearEndpoints.private[networkKey];
+      }
+      this.logger.error('Unhandled linear wsKey: ', { ...loggerCategory, wsKey });
+      return linearEndpoints[networkKey];
+    }
+    return inverseEndpoints[networkKey];
+  }
+
+  private getWsKeyForTopic(topic: string) {
+    return this.isInverse() ? wsKeyInverse : getLinearWsKeyForTopic(topic);
   }
 };