Credential & auth setup
API key configuration, OAuth flows where required, and IP whitelisting for your VPS. All credentials are stored in environment variables — never hardcoded in source files. You retain sole ownership of all access tokens.
Broker Integration
Is your broker's API the weakest link in your automation stack?
We handle the full broker connection — credentials, order routing, latency profiling, and redundancy — so the link between your bot and the market is solid.
Connecting a bot to a broker is not a plug-and-play process
Broker API integration is routinely underestimated in complexity. Each broker has different authentication flows, rate limits, order type support, and error-handling behaviour. A bot that works perfectly in a backtesting environment can behave erratically in live trading if the integration layer has not been built to handle rejected orders, partial fills, timeout errors, and connection drops gracefully. Mercer & Hartwell has built and stress-tested integrations for IC Markets, XTB, Alpaca, and Interactive Brokers TWS, and has documented the edge cases for each. When onboarding a new broker, we run a two-week paper-trading validation period where every API call and response is logged and reviewed before a single live order is placed. This validation step is not optional — it is the difference between a reliable automated system and one that fails silently at the worst moment.
What broker integration covers end to end
Order routing logic
Market, limit, stop, and stop-limit order routing tested across normal, low-liquidity, and high-volatility conditions. Partial fill handling and order reconciliation logic included for every integration.
Latency profiling
We measure round-trip latency between your VPS location and the broker's execution server, then select the optimal server region to minimise execution delay. For latency-sensitive strategies, this step alone can materially affect execution quality.
Connection redundancy
Primary and fallback connection paths configured with automatic failover. If the primary WebSocket drops, the bot reconnects within five seconds via a secondary endpoint without interrupting any open position management.
“I'd tried integrating with Interactive Brokers on my own for two months before contacting Mercer & Hartwell. They had the connection stable and stress-tested within ten days. The two-week paper-trading validation they insisted on caught three edge cases in the order routing that I would never have found on my own.”
Ștefan Varga, algorithmic trader, Cluj-Napoca
Which broker are you using — and is its API ready?
Send us your broker name and we'll confirm compatibility and outline the integration timeline within 48 hours.
Get compatibility confirmed