refactor: use cross-chain stream api

Author: piavgh

apps/kyberswap-interface/src/pages/CrossChainSwap/adapters/OptimexAdapter.ts

@@ -251,6 +251,10 @@ export class OptimexAdapter extends BaseSwapAdapter {
     _nearWallet: any,
     sendBtcFn?: (params: { recipient: string; amount: string | number }) => Promise<string>,
   ): Promise<NormalizedTxResponse> {
+    if (!this.tokens?.length) {
+      await this.getTokens()
+    }
+
     // For EVM -> BTC flow, txData should already exist from getQuote
     // For BTC -> EVM flow, we need to initiate the trade here
     let txData: { deposit_address: string; payload?: string; trade_id: string }