Polygon.io provides institutional-grade financial market data via a clean REST and WebSocket API. Access real-time trades, quotes, aggregates, and snapshots for US stocks, options chains, forex pairs, and crypto assets. Includes company financials, news, and technical indicators. Used by quant funds, fintech apps, and trading bots.
https://api.polygon.io/v2
Auth type
API Key Header
Auth header
?apiKey=YOUR_API_KEY
Rate limit
5 calls/min (free) · Unlimited (paid)
Pricing
from $29/mo
Free quota
Unlimited calls, end-of-day data only, 15-min delay
Documentation
https://polygon.io/docs
Endpoint status
Server online — HTTP 404 — server is online but path returned an error (may require auth)876ms
(checked Mar 29, 2026)
Builder score
B
72%
builder-friendly
Pass your API key as a query parameter named apiKey on every request.
?apiKey=YOUR_API_KEY
Free: delayed data, limited endpoints. Starter $29/mo: real-time data. Developer $79/mo: options + forex. Advanced $199/mo: unlimited assets + WebSocket.
| Method | Path | Description |
|---|---|---|
| GET | /aggs/ticker/{ticker}/range/{multiplier}/{timespan}/{from}/{to} |
Aggregate OHLCV bars for a ticker |
| GET | /snapshot/locale/us/markets/stocks/tickers |
Real-time snapshots for all US stocks |
| GET | /last/trade/{stocksTicker} |
Get the last trade for a stock |
| GET | /reference/tickers |
List and search all available tickers |
| GET | /v3/reference/options/contracts |
List options contracts with filtering |
| GET | /v2/forex/currencies |
Get all forex currency pairs |
curl "https://api.polygon.io/v2/aggs/ticker/AAPL/range/1/day/2024-01-01/2024-01-31?adjusted=true&sort=asc&apiKey=$POLYGON_API_KEY"
{
"ticker": "AAPL",
"resultsCount": 21,
"results": [{
"v": 55884904,
"o": 185.57,
"c": 185.92,
"h": 186.74,
"l": 183.82,
"t": 1704067200000,
"n": 531365
}]
}
Data sourced from API Map. Always verify pricing and rate limits against the official Polygon.io documentation.