Engineering · TRUEFIX LABS

Broker Adapter Architecture for Multi-Broker Trading Systems

A practical adapter boundary for REST, WebSocket, FIX, authentication, capabilities, native symbols, and provider-specific order behavior.

Short answer. A broker adapter should translate a provider protocol into stable application contracts while preserving native identifiers and limitations. It should expose capabilities and connection state separately from the provider name, normalize only what is safe to normalize, and retain the original request and receipt for reconciliation.

Adapter responsibilities

An adapter owns authentication, rate limits, request signing, transport reconnects, provider-specific serialization, native error mapping, and event sequence handling. It should not own portfolio policy or strategy decisions.

Capability contract

ProviderDefinition → ClientInstance → CapabilityScope + ConnectionState + Environment + Entitlement

The same provider can expose different capabilities for a market, account, environment, or permission set. Query this contract at runtime.

Native details to preserve

Native symbol and contract identifiers.
Native order ID and client order ID.
Tick, lot, contract multiplier, and price precision.
Provider timestamps, sequence numbers, and error codes.
Paper, demo, testnet, and live environment identity.

Testing

Use recorded fixtures for signing, order serialization, event replay, reconnect recovery, and reconciliation. A conformance suite should test partial fills, duplicate events, rejected orders, rate limits, and unknown execution results.

Sources

Last verified: 2026-09-28. Provider capabilities can change by region, account, product, environment, and entitlement; verify the linked official documentation before production use.

Last updated: 2026-09-28