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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

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

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Platform-specific details

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.