Polygon.io API
Financial market data platform providing real-time and historical stock, options, forex, and crypto data via REST and WebSocket APIs with comprehensive coverage of US markets.
Best When
An agent needs comprehensive US financial market data - stocks, options, crypto - for analysis or algorithmic trading signals.
Avoid When
You need order execution (use Alpaca) or primarily need international market data.
Use Cases
- • Fetching OHLCV (candlestick) data for backtesting trading strategies
- • Real-time stock quotes and trade streaming via WebSocket
- • Options chain data for derivatives analysis agents
- • Technical indicator data for signal generation
- • Ticker search and company fundamentals lookup
Not For
- • Order execution (data only, not a broker)
- • International markets outside US (limited non-US coverage)
- • Teams needing free real-time data at scale
Alternatives
Full Evaluation Report
Comprehensive deep-dive: security analysis, reliability audit, agent experience review, cost modeling, competitive positioning, and improvement roadmap for Polygon.io API.
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Package Brief
Quick verdict, integration guide, cost projections, gotchas with workarounds, and alternatives comparison.
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Score Monitoring
Get alerted when this package's AF, security, or reliability scores change significantly. Stay ahead of regressions.
Continuous monitoring
Scores are editorial opinions as of 2026-03-01.