Written by Tigran Mkrtchyan · Reviewed and fact-checked by Narek Gevorgyan · Published September 4, 2026 · Last updated September 4, 2026 · Pricing and limits verified September 2026 In this guide What each API actually covers What you bolt on around a market data API Pricing compared Free tiers, rate limits, and the license Coverage compared One call or several AI, MCP, and streaming What developers actually rate them Which one should you pick? Conclusion FAQ Four invoices render one portfolio screen. Nobody tells you that on day one.