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Join the Graylayer Discord

Request an API key in #api-key-request under the Community tab.
The proxy supports WebSocket connections to all major platforms. Connect to the proxy WebSocket endpoint and it forwards messages to and from the upstream platform.

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Connection pattern

wss://gateway.graylayer.tech/ws/{platform}/{channel}?api_key=YOUR_KEY
Because browsers cannot set custom headers on WebSocket connections, authentication uses the api_key query parameter instead of the X-API-Key header.

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Available connections

PlatformPathUpstream
Polymarket market/ws/polymarket/marketwss://ws-subscriptions-clob.polymarket.com/ws/market
Polymarket user/ws/polymarket/userwss://ws-subscriptions-clob.polymarket.com/ws/user
Polymarket sports/ws/polymarket/sportswss://sports-api.polymarket.com/ws
Kalshi/ws/kalshiwss://api.elections.kalshi.com/trade-api/ws/v2
Coinbase/ws/coinbasewss://ws-feed.exchange.coinbase.com
Gemini/ws/geminiwss://wsapi.fast.gemini.com

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Testing with wscat

npm install -g wscat

wscat -c "wss://gateway.graylayer.tech/ws/polymarket/market?api_key=your_key"

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Platform-specific details

Polymarket

Market, user, and sports channels. Requires subscription messages.

Kalshi

Full Kalshi WebSocket with RSA-PSS auth handled by the proxy.

Coinbase

Ticker, level2, and heartbeat channels for crypto pairs.

Gemini

Market data and prediction market streams.