TWS API + FIX CTCI + Client Portal Web API (REST/WebSocket); Python, Java, C++, C#, VB, ActiveX, DDE bindings. Most complete in retail.
Best brokers for
Algo / API access
Algorithmic traders need first-class API access: REST + streaming, multi-language SDKs, paper-trading parity, and reliable order-flow status reporting.
Public Open API (developer.tastytrade.com) with REST + WebSocket access. Customers opt in under Manage → My Profile → API. Official JavaScript SDK plus a well-maintained community Python SDK (tastyware/tastytrade on GitHub). Few retail brokers offer this depth of programmatic access.
Public API supports multi-leg programmatic options strategies; API trades qualify for the rebate program. Combined with Agents and the Perplexity "Public Agent Skill" integration, Public is the most accessible programmatic-trading stack outside IBKR.
EasyLanguage in-platform scripting + WebAPI for external automation. Best US-focused systematic trading stack outside IBKR.
Rankings reflect our editorial assessment. Visit each broker’s full review for the underlying methodology and freshness date.