WebSocket subscriptions

Single endpoint /ws supports multiple multiplexed subscriptions per connection. Authenticate user-scoped channels by passing { method: “sessionAuth”, sessionId } before subscribing.

Subscribe / unsubscribe message

// Subscribe
{ "method": "subscribe",
  "subscription": { "type": "trades", "coin": "BTC" } }

// Unsubscribe
{ "method": "unsubscribe",
  "subscription": { "type": "trades", "coin": "BTC" } }

// Server push
{ "channel": "subscription",
  "subscription": { "type": "trades", "coin": "BTC" },
  "data":         [ ...trade events... ] }

Channel	Description
allMids	Mid price snapshot for every market
marketSummary { coin }	Mark price, funding, oracle status for a market
l2Book { coin }	Incremental L2 order book updates
trades { coin }	Public trade tape for a market
candle { coin, interval }	Aggregated candles
userEvents { user }	Per-user balance / position / margin updates
orderUpdates { user }	Per-user open-order changes
executionReports { user }	Per-user fill / reject / cancel reports