Broker API Connectivity Checklist for Algo Trading

Start with the broker’s official requirements

A broker API connection is a permissioned link between trading software and a broker account. Before configuring anything, read the broker’s current API documentation, terms, onboarding requirements and applicable exchange or regulatory notices. Confirm which account type is supported, whether API access must be enabled, what instruments and order types are available, and whether the broker requires an approved vendor or static network address. These details vary by broker and can change. Do not rely on a tutorial written for another broker or an older API version. Record the documentation date and the exact environment you are using so later troubleshooting starts from a known baseline.

Separate login, authorization and order permission

An API key, login session and trading authorization are different pieces of the setup. Follow the broker’s approved authentication flow and grant only permissions the integration actually needs. Check how tokens expire, how a session is renewed, and whether a manual login or additional confirmation is required. Never paste credentials into a public repository, a shared document or a support message. Store secrets in the platform’s supported secure configuration, restrict access to the device, and revoke credentials if you suspect exposure. Confirm that the account displayed in the terminal is the intended account before enabling order actions; a valid connection to the wrong account is still a serious configuration error.

Test the whole order lifecycle

A green connection indicator does not prove that the complete workflow is correct. In a broker-approved test or paper environment where available, inspect market data, instrument identifiers, quantity, order submission, acknowledgement, modification, cancellation and final order status. Check what happens when the broker rejects an order or returns a delayed response. Make sure the strategy can distinguish a pending order from a filled position and does not submit duplicates after a timeout. Compare the terminal’s order book with the broker’s own records. If live testing is the only available option, use the smallest permitted exposure and understand the risk before proceeding.

Document a recovery plan

Connectivity can fail because of internet interruptions, broker maintenance, expired authorization, application updates or rate limits. Decide in advance how the strategy should behave when quotes stop updating or an order status cannot be confirmed. A safe workflow pauses new entries when critical state is unknown, raises a visible alert and gives the operator a way to reconcile the account. Keep a short runbook with the broker support route, version number, last known order identifiers and steps for safely restarting. Recheck connectivity after material changes. This checklist improves operational clarity, but it cannot remove market risk or guarantee that an order will execute at an expected price.