Here are ten brokers that offer Python APIs for algorithmic trading, allowing you to automate your trading strategies using Python:

1. **Interactive Brokers (IBKR)**
- **API**: Interactive Brokers offers a comprehensive Python API through their Interactive Brokers API platform.
- **Features**: Access to a wide range of asset classes, historical data, real-time data, and advanced order types.
- **Documentation**: [Interactive Brokers API](https://interactivebrokers.github.io/tws-api/)

2. **Alpaca**
- **API**: Alpaca provides a commission-free trading API for US stocks and crypto trading.
- **Features**: Real-time market data, paper trading, and full access to trading functionalities.
- **Documentation**: [Alpaca API](https://alpaca.markets/docs/api-documentation/)

3. **TD Ameritrade**
- **API**: TD Ameritrade offers a powerful API for trading US stocks, ETFs, and options.
- **Features**: Real-time quotes, historical price data, and advanced order capabilities.
- **Documentation**: [TD Ameritrade API](https://developer.tdameritrade.com/apis)

4. **Robinhood**
- **API**: Robinhood offers an unofficial Python API for trading stocks, options, and crypto.
- **Features**: Commission-free trading and access to real-time market data.
- **Documentation**: [Robinhood API on GitHub](https://github.com/robinhood-unofficial/robinhood-api)

5. **Zerodha (Kite Connect)**
- **API**: Zerodha provides the Kite Connect API for trading on Indian markets.
- **Features**: Historical data, live market data, and various order types.
- **Documentation**: [Kite Connect API](https://kite.trade/docs/connect/v3/)

6. **Fyers**
- **API**: Fyers offers a comprehensive API for trading on Indian stock markets.
- **Features**: Market data, trading, and portfolio management functionalities.
- **Documentation**: [Fyers API](https://api-docs.fyers.in/)

7. **OANDA**
- **API**: OANDA offers a Python API for forex and CFD trading.
- **Features**: Access to forex market data, trade execution, and account management.
- **Documentation**: [OANDA API](https://developer.oanda.com/rest-live-v20/introduction/)

8. **IG Markets**
- **API**: IG Markets provides a trading API for forex, indices, commodities, and more.
- **Features**: Real-time prices, historical data, and comprehensive trading capabilities.
- **Documentation**: [IG API](https://labs.ig.com/gettingstarted)

9. **TradeStation**
- **API**: TradeStation offers a powerful API for trading stocks, options, futures, and forex.
- **Features**: Access to live and historical data, advanced order types, and extensive documentation.
- **Documentation**: [TradeStation API](https://developer.tradestation.com/)

10. **E*TRADE**
- **API**: E*TRADE offers an API for trading stocks, options, ETFs, and mutual funds.
- **Features**: Market data, order management, and account information.
- **Documentation**: [E*TRADE API](https://apisb.etrade.com/docs/api/)

These brokers offer robust APIs that enable you to develop and execute trading algorithms using Python. Each broker has its own set of features, asset classes, and API documentation, so it's important to choose one that aligns with your trading needs and strategies.