Polygon.io
./TradeStocks, options, forex, and crypto market data over REST and WebSocket, with a free self-serve API key
MCPllms.txt
$ protocol support
$ payment protocols
none documented — this service is not reachable over an agent payment protocol
$ agent access
authAPI Key
onboardingFull — agent can self-onboard
tosNeutral — no bot restrictions
webhooksNo
free tierYes
billingsubscription
#market-data#stocks#options#ohlc#mcp
https://polygon.io
// last verified 8/26/2026
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