Aster API WebSocket

/ws/<streamName>

/stream?streams=name1/name2/...

{"stream":"<name>","data":<payload>}

Market: subscribe / unsubscribe

{"method":"SUBSCRIBE","params":["btcusdt@aggTrade","btcusdt@depth"],"id":1}

{"result":null,"id":1}

UNSUBSCRIBE

LIST_SUBSCRIPTIONS

id

Stream names (market)

<symbol>@aggTrade

<symbol>@depth

@depth@500ms

@depth@100ms

<symbol>@depth5

@depth10

@depth20

<symbol>@kline_<interval>

<symbol>@markPrice

<symbol>@markPrice@1s

!markPrice@arr

!markPrice@arr@1s

<symbol>@miniTicker

!miniTicker@arr

<symbol>@ticker

!ticker@arr

<symbol>@bookTicker

!bookTicker

<symbol>@forceOrder

!forceOrder@arr

User data stream

1. Start:

   POST /fapi/v3/listenKey

   (signed) →

   { "listenKey": "..." }

   . If account already has active listenKey, same key returned and validity extended 60 min.
2. Connect:

   wss://fstream.asterdex.com/ws/<listenKey>

   .
3. Keepalive:

   PUT /fapi/v3/listenKey

   (signed) at least every <60 min (e.g. every 30 min).
4. Close:

   DELETE /fapi/v3/listenKey

   (signed).

E

ACCOUNT_UPDATE

ORDER_TRADE_UPDATE

ACCOUNT_CONFIG_UPDATE

MARGIN_CALL

listenKeyExpired

Order book sync (depth stream)

1. Connect to

   btcusdt@depth

   (or combined).
2. Buffer incoming events.
3. Get snapshot:

   GET /fapi/v3/depth?symbol=BTCUSDT&limit=1000

   .
4. Drop events with

   u

   < snapshot

   lastUpdateId

   .
5. First valid event:

   U

   ≤

   lastUpdateId

   and

   u

   ≥

   lastUpdateId

   .
6. Then each event’s

   pu

   must equal previous event’s

   u

   ; else re-sync from step 3.
7. Quantity in events is absolute; quantity 0 means remove that price level.