Polygon.io

Developer-first market data API offering real-time and historical stock, options, crypto, and FX data for trading applications.

by Polygon.ioListed January 17, 2026

Polygon.io is a developer-first market data provider covering stocks, options, crypto, FX, and futures with real-time and historical endpoints. Its clean REST and WebSocket APIs make it a favorite data layer for trading bots and AI agents. In late 2025 the company rebranded to Massive.com as it expanded into a broader multi-asset platform, keeping the Polygon APIs, keys, and accounts working.

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market-data

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