Massive (formerly Polygon.io)
Market data APIs for stocks, options, forex and crypto
Massive, the October 2025 rebrand of Polygon.io, sells REST, WebSocket and flat-file market data APIs for US equities, options, forex, crypto and futures, plus reference data, corporate actions, fundamentals, news and technical indicators. Customers include fintech developers, brokerages and quantitative teams, and legacy polygon.io endpoints and keys still work.
GAII take
Developer-friendly and accessible relative to exchange-direct feeds; confirm redistribution rights and latency commitments for institutional use.
Developer-friendly and accessible relative to exchange-direct feeds; confirm redistribution rights and latency commitments for institutional use.
- Website
- polygon.io
- Headquarters
- Atlanta, GA, USA
- Founded
- 2016
- Company type
- Startup
- Funding
- Series A
- Latest round
- Series A, $6m, October 2020 (e.ventures, formerly Headline)
- Status
- Active — Rebranded from Polygon.io to Massive on 30 October 2025; the primary site moved to massive.com and the API host to api.massive.com, but existing polygon.io endp
- Also in
- Quant, Portfolio & Trading
- Buyer
- Hedge fundsAsset managersRetail investors
- Asset class
- Public equitiesDigital assetsMacro, FX & commodities
- Workflow
- Trading & executionResearch & diligence
- Ai capability
- Time-series ML
- Delivery
- API / data feed
GAII ID GAII-T0278 · Updated 2026-10-22 · Compiled from public sources for educational and informational purposes. Not investment advice.