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Two live streams exist, both plain Server-Sent Events:
  • /api/market/stream for live bars and quotes;
  • /api/account/stream for orders, positions, and balances.
SSE means no websocket library, no custom protocol, and no handshake to debug. An EventSource in a browser, a for await loop on a server, or curl -N on the command line is a complete client.

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The snapshot law

Both streams replay a full snapshot on every connect and reconnect, then send incremental events. This one rule makes client state trivial:
  • on connect, replace your local state with the snapshot;
  • after that, apply events as they arrive;
  • if the connection drops, reconnect and replace again.
Treat anything absent from a snapshot as gone. A working order that filled while you were disconnected is simply not in the next snapshot, and that absence is the truth. You never need to reconcile a gap, replay a cursor, or ask what you missed. Reconnecting is always safe and always sufficient.