add USDC perp client with tests

src/types/request/index.ts

@@ -1,2 +1,3 @@
 export * from './account-asset';
 export * from './usdt-perp';
+export * from './usdc-perp';

src/types/request/usdc-perp.ts

@@ -0,0 +1,19 @@
+export interface USDCKlineRequest {
+  symbol: string;
+  period: string;
+  startTime: number;
+  limit?: string;
+}
+
+export interface USDCOpenInterestRequest {
+  symbol: string;
+  period: string;
+  limit?: number;
+}
+
+export interface USDCLast500TradesRequest {
+  category: string;
+  symbol?: string;
+  baseCoin?: string;
+  limit?: string;
+}

src/types/shared.ts

@@ -25,6 +25,12 @@ export interface APIResponse<T> {
   result: T;
 }
 
+export interface USDCAPIResponse<T> {
+  retCode: number;
+  retMsg: 'OK' | string;
+  result: T;
+}
+
 export interface APIResponseWithTime<T = {}> extends APIResponse<T> {
   /** UTC timestamp */
   time_now: numberInString;
@@ -37,15 +43,15 @@ export interface SymbolParam {
   symbol: string;
 }
 
-export interface SymbolLimitParam {
+export interface SymbolLimitParam<TLimit = number> {
   symbol: string;
-  limit?: number;
+  limit?: TLimit;
 }
 
-export interface SymbolPeriodLimitParam {
+export interface SymbolPeriodLimitParam<TLimit = number> {
   symbol: string;
   period: string;
-  limit?: number;
+  limit?: TLimit;
 }
 
 export interface SymbolFromLimitParam {