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Interactive Brokers API

In-depth entry

by Interactive Brokers LLC · API service · also known as IBKR API, TWS API, IB API, Client Portal API, IBKR Web API

Programmatic trading and market-data access to Interactive Brokers accounts through the TWS API, the REST-based Web API and FIX

ProprietaryUsage-basedPaidCloudLocal
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Link verified Nov 2, 2026

Overview

The Interactive Brokers API is the family of programmatic interfaces that Interactive Brokers LLC offers to clients for trading and market data, placing it in the financial analysis and investing category. The longest-standing one is the TWS API: a socket protocol spoken by the Trader Workstation or the headless IB Gateway, with official client libraries in Python, Java, C++, C# and VB.NET. Through it an application can request real-time and historical bars, option chains, account and position data, and submit or modify orders across the broker's stock, option, futures, forex and bond markets.

The Web API (previously called Client Portal API) exposes similar functions over REST and WebSocket, either through a locally run gateway or OAuth for institutional clients, and FIX connectivity serves high-volume firms. Documentation, sample code and a Python testbed live on the IBKR Campus site, and third-party wrappers such as ib_insync-style libraries are widely used in the Python community.

Typical users are systematic traders, small funds and researchers who want direct broker connectivity from their own code, as well as platforms like QuantConnect that route orders to IBKR accounts. Market data requires subscriptions attached to the account, and a paper-trading account is the usual test environment.

Constraints include the need to keep TWS or IB Gateway running and authenticated, pacing limits on historical data requests, message-based asynchrony that complicates simple scripts, periodic gateway restarts, and the fact that there is no free market-data feed without an account and subscriptions.

Capabilities

  • Order placement, modification and cancellation across asset classes
  • Real-time quotes, depth and historical bars via TWS API
  • Account, position and P&L reporting
  • REST and WebSocket access through the Web API
  • FIX connectivity for institutional order flow
  • Official client libraries in Python, Java, C++, C# and VB.NET
  • Paper-trading accounts for testing

Typical workflows

  1. Run IB Gateway on a server and drive it from a Python strategy
  2. Pull historical bars for research subject to pacing limits
  3. Connect QuantConnect or another platform to a live IBKR account

Strengths

  • Direct access to a global multi-asset broker
  • Several interface styles (socket, REST, FIX)
  • Long-established and well documented by the community

Limitations

  • TWS or IB Gateway must be running and periodically re-authenticated
  • Historical data pacing limits
  • Asynchronous message model has a learning curve
  • Market data requires account subscriptions

Prerequisites

  • Interactive Brokers account (paper or live)
  • TWS or IB Gateway for the TWS API
  • Market data subscriptions as needed

Who it is for

  • Systematic and algorithmic traders
  • Quant developers integrating a broker
  • Researchers needing broker-grade historical data

Alternatives & comparison

Alpaca exposes a cloud REST API with no local gateway and focuses on US equities, options and crypto; IBKR covers far more markets but requires a running gateway for the TWS API. Kraken's API is crypto-only. QuantConnect is a research platform that can route to IBKR rather than a competing broker API.

  • Alpaca

    API-first US brokerage offering a Trading API, Market Data API and Broker API for stocks, ETFs, options and crypto, with paper trading

    MixedFreemium
  • Bloomberg Terminal

    Bloomberg's subscription workstation for market data, news, analytics, messaging and execution, with Excel integration and the BLPAPI library for C++, Java, .NET and Python

    ProprietaryPaid
  • Databento

    Usage-priced market data platform with normalized order-book (MBO/MBP), trades, OHLCV and reference schemas for futures, options and equities, delivered via historical, live and batch APIs in the DBN format

    MixedUsage-based
  • Kraken API

    REST, WebSocket and FIX interfaces to the Kraken cryptocurrency exchange for market data, spot and derivatives trading and account management

    ProprietaryFree
  • Massive (formerly Polygon.io)

    Market data platform (renamed from Polygon.io in October 2025) with REST and WebSocket APIs, flat files and SQL access for US stocks, options, indices, forex, crypto and futures

    ProprietaryPaid
  • QuantConnect

    Algorithmic trading platform built on the open-source LEAN engine, with cloud backtesting, research notebooks and brokerage-connected live trading

    MixedFreemium
Compare Interactive Brokers API with its alternatives →

Sources & verification

Primary sources consulted for this record. Claims are tied to the fields each source supports; the automated link checker re-verifies every URL on a schedule.

  • Official documentation
    TWS API documentation

    https://www.interactivebrokers.com/campus/ibkr-api-page/trader-workstation-api

    Supports: capabilities, prerequisites

    checked Nov 1, 2026
  • Official documentation
    Web API documentation

    https://www.interactivebrokers.com/campus/ibkr-api-page/webapi-doc

    Supports: interfaces

    checked Nov 1, 2026
  • Official site
    IBKR Campus — API

    https://www.interactivebrokers.com/campus/ibkr-api-page

    Supports: name, summary, capabilities, languages

    checked Nov 1, 2026
  • Pricing page
    IBKR commissions

    https://www.interactivebrokers.com/en/pricing/commissions-home.php

    Supports: pricing_model

    checked Nov 1, 2026
  • Repository
    InteractiveBrokers on GitHub

    https://github.com/InteractiveBrokers

    Supports: languages

    checked Nov 1, 2026
Confidence
High
Reviewed
Nov 1, 2026
Links
Redirected · Nov 2, 2026

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