Free APIFinanceAPI keyOfficial

Polygon.io

Institutional-grade market data with a free tier for end-of-day stocks, crypto and FX

Polygon.io (now branded Massive) offers stocks, options, forex, and crypto market data including aggregates, trades, quotes, and reference data. The free Basic plan provides end-of-day and historical data at 5 calls/minute, with a free key and no credit card. Paid plans unlock real-time and unlimited calls.

View docs Get an API key

Free tier

Free Basic plan, no credit card: 5 API calls/minute, end-of-day and ~2 years of historical data. Paid plans from ~$29/mo add real-time and unlimited calls.

Rate limits

Free: 5 API calls per minute. Paid: unlimited.

Auth

API key

Base URL

https://api.polygon.io

What you'd build with it

Backtest with end-of-day OHLCV aggregates for stocks, FX and crypto
Ticker reference search and metadata for an instrument-lookup skill
Daily prev-close snapshots for a watchlist automation
Historical bar pulls for a charting workflow within the 5/min budget

Key endpoints

GET/v2/aggs/ticker/AAPL/range/1/day/2026-01-01/2026-06-01?apiKey=KEYAggregate OHLCV bars for a ticker over a date range
GET/v2/aggs/ticker/AAPL/prev?apiKey=KEYPrevious trading day's OHLCV for a ticker
GET/v3/reference/tickers?apiKey=KEYReference data and search across listed tickers
GET/v1/open-close/AAPL/2026-06-19?apiKey=KEYDaily open/close for a specific date
GET/v2/aggs/ticker/X:BTCUSD/range/1/day/2026-01-01/2026-06-01?apiKey=KEYCrypto aggregate bars (X: prefix)

Members

Members get the runnable recipe

Create a free account Sign in