Messages
Market data
L2 orderbook updates
Endpoint:
wss://api.testnet.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.
Full L2 orderbook snapshot followed by event-driven incremental deltas for a single market.
On subscribe: full snapshot up to nLevels per side, then delta updates as orders are placed, modified, or cancelled. Each delta carries a monotonically increasing lastSequenceId (continuous with the snapshot’s lastSequenceId) — drop or re-subscribe on any gap.
WSS
Messages