L2 orderbook

Endpoint: wss://api.arcus.xyz/v1/ws — one socket multiplexes every channel and RPC request. Click Connect, then send the example subscribe message below to start receiving data.

Periodic full L2 orderbook snapshots for a single market. On subscribe, the server sends the current book up to nLevels price levels per side, then continues to broadcast a fresh full snapshot every ~200ms.

No incremental updates — each message replaces the prior book state. Use l2OrderbookUpdates if you need to maintain your own local book.

A connection may subscribe more than once to the same market when each subscribe uses a distinct (sigFigs, roundStep) pair. subscribed, channel_data, and unsubscribed frames echo those fields (omitted for full precision) so the client can demux views. Unsubscribe must include the same pair to drop one view without affecting the others.