Massive (formerly Polygon.io)
polygon.io
Provides stock, options, futures, indices, forex, and crypto market data via REST API, WebSocket streaming, and bulk downloadable flat files.
The Massive (formerly Polygon.io) API terms not fully documented by the vendor. Verified 2026-07-12 with per-field source links.
Base URL
not documented null
no sourceAuth
not documented null
no sourceFree tier
not documented null
no sourcePricing model
not documented null
no sourcePricing
not documented null
no sourceRate limits
not documented null
no sourceOpenAPI spec
not documented null
no sourceMCP server
MCP server available to connect to AI tools like Claude Code, Cursor, and ChatGPT
massive.com ↗