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The choice of broker depends entirely on your trading style. Here is a detailed comparison of the two most popular options for German investors.

Trade Republic

Fees: 1 euro per trade, free savings plans
Products: Stocks, ETFs, crypto, derivatives
API: No — manual trading only
Best for: Beginners, savings plan investors, mobile-first traders

Interactive Brokers

Fees: From $1 per trade, tiered pricing for high volume
Products: Everything — stocks, options, futures, forex, bonds worldwide
API: Full TWS API — perfect for AI signal automation
Best for: Active traders, options traders, API/algorithmic trading

Our Recommendation

For AI trading with automated execution: Interactive Brokers. For simple ETF savings plans and casual trading: Trade Republic. Many experienced traders use both — Trade Republic for savings plans, IB for active trading.