fix: add env fallbacks for hardcoded RPC endpoints

core/src/exchanges/limitless/client.ts

@@ -1,5 +1,6 @@
 import { HttpClient, OrderClient, OrderBuilder, OrderSigner, MarketFetcher, Side, OrderType } from '@limitless-exchange/sdk';
 import { Wallet, providers, Contract, utils } from 'ethers';
+import { LIMITLESS_RPC_URL } from './config';
 
 const DEFAULT_LIMITLESS_API_URL = process.env.LIMITLESS_BASE_URL || 'https://api.limitless.exchange';
 
@@ -378,8 +379,7 @@ export class LimitlessClient {
         const USDC_ADDRESS = "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913";
         const ABI = ["function balanceOf(address) view returns (uint256)", "function decimals() view returns (uint8)"];
 
-        // Use a public RPC for Base
-        const provider = new providers.StaticJsonRpcProvider('https://mainnet.base.org', {
+        const provider = new providers.StaticJsonRpcProvider(LIMITLESS_RPC_URL, {
             chainId: 8453,
             name: 'base',
         });

core/src/exchanges/limitless/config.ts

@@ -0,0 +1 @@
+export const LIMITLESS_RPC_URL = process.env.LIMITLESS_RPC_URL || 'https://mainnet.base.org';

core/src/exchanges/limitless/index.ts

@@ -32,6 +32,7 @@ import { FetcherContext } from '../interfaces';
 import { limitlessApiSpec } from './api';
 import { LimitlessAuth } from './auth';
 import { LimitlessClient } from './client';
+import { LIMITLESS_RPC_URL } from './config';
 import { limitlessErrorMapper } from './errors';
 import { LimitlessFetcher } from './fetcher';
 import { LimitlessNormalizer } from './normalizer';
@@ -553,7 +554,7 @@ export class LimitlessExchange extends PredictionMarketExchange {
         //
         // Static network avoids ethers v5 auto-detect (eth_chainId), which can throw
         // noNetwork / NETWORK_ERROR on flaky public RPCs (#92).
-        const provider = new providers.StaticJsonRpcProvider('https://mainnet.base.org', {
+        const provider = new providers.StaticJsonRpcProvider(LIMITLESS_RPC_URL, {
             chainId: 8453,
             name: 'base',
         });

core/src/exchanges/opinion/config.ts

@@ -4,4 +4,4 @@ export const OPINION_MAX_PAGE_SIZE = 20;
 
 // CLOB SDK chain constants
 export const OPINION_CHAIN_ID = 56;
-export const OPINION_DEFAULT_RPC_URL = 'https://bsc-dataseed.binance.org';
+export const OPINION_DEFAULT_RPC_URL = process.env.OPINION_RPC_URL || 'https://bsc-dataseed.binance.org';