Markets

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.

Global channel — no id required. Streams full per-market metadata for all listed markets.

Snapshot-only channel: every message is a full map of all markets keyed by marketId (same shape on subscribe and on every periodic re-emission, no partial diffs). Clients replace their entire markets view on each message.

Cadence: ~5s periodic snapshot, plus an immediate snapshot when a new funding rate is applied (~hourly) so the just-applied fundingRate propagates without waiting for the next periodic snapshot.

Field coverage today: marketDisplayName, marketId, baseAsset, quoteAsset, status (always ONLINE today — dynamic state changes not yet plumbed), static config (tick/step/min/max sizes, margin fractions, fees), oraclePrice, fundingRate, nextFundingRate, and nextFundingAt are populated. priceChange24h is the fractional change in the mark price over the trailing 24h (not the oracle price): a per-market ring holds the first mark price seen each minute over a rolling 1441-minute window, and the value is (currentMark - oldestMark) / oldestMark. volume24h, high24h, low24h, and trades24h are populated by the rolling-24h aggregator (in-memory ring of the last 1440 closed 1m candles per market) and refresh every ~10s. High/low use only closed candles with at least one trade (gap-fill buckets are excluded). openInterest is the total size of all open long positions per market (equals total short), in base asset units, refreshed from a periodic snapshot (default ~60s) so it may lag real time. openInterestCap (present only while a cap is active) is the operator-set maximum open-interest USD notional, refreshed on the same cadence.