Massive WebSocket API

REST discovered

Details

URL: wss://socket.massive.com/{asset_class}
Docs: https://polygon.io/docs/websocket/quickstart

Authentication

Massive API key api_key discovered Get key ↗

api_key=<credential>

Sign up or log in to your Massive/Polygon account, then open the API Keys dashboard to copy your API key. The REST docs say the same key can be sent either as the apiKey query parameter or as Authorization: Bearer <API_KEY>, and the WebSocket docs use it in the auth message payload.