Connect to WebSocket

Upgrade an HTTP connection to a WebSocket connection.

Authentication (required): Pass your API key via the X-API-Key header.

Connections without a valid API key are rejected with HTTP 401.

After connecting, communicate via JSON messages. See the schemas below for all message types.

User data events (orders, trades, balances) are automatically delivered to authenticated connections — no subscription needed.

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WebSocket connection established. Communication continues via WebSocket frames.

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application/json