massive-websocketslisted

# massive-websockets The live streaming foundation. Any skill that needs to react to market events as they happen reads this first. ## Why this exists REST snapshots are 15 minutes stale on most stocks plans, and even on real-time tiers you pay a request-per-event overhead that breaks down above a few hundred symbols. WebSockets push every update to you as it hits the exchange. One connection, thousands of symbols, no polling. ## Endpoints | Asset | URL | Requires | |---|---|---| | US stocks (real-time) | `wss://socket.polygon.io/stocks` | Stocks Advanced + signed real-time addendum | | US stocks (delayed) | `wss://delayed.polygon.io/stocks` | Stocks Starter or higher | | US stocks (Business) | `wss://business.polygon.io/stocks` | Stocks Business (FMV/AM channels) | | US options | `wss://socket.polygon.io/options` | Options Developer | | Crypto | `wss://socket.polygon.io/crypto` | Crypto Developer | | FX | `wss://socket.polygon.io/forex` | Forex Starter | | Business cluster | `wss://business.polygon.io/{asset}` | Business plan | The `socket.polygon.io` host is the legacy real-time domain and still active when the signed real-time data agreement is in place. **The undocumented `wss://delayed.polygon.io/{asset}` endpoint** is what the real-time host suggests in its error message when your key doesn't have the real-time entitlement: "you can connect to the delayed websocket at wss://delayed.polygon.io/stocks." It's the fallback for non-Advanced plans and isn't in the publ