Order Book

Type: NONE

Weight: 2–20 (by limit)

GET /fapi/v1/depth

Order-book snapshot for one symbol. Public endpoint: no X-MBX-APIKEY, timestamp or signature required.

Request

GET /fapi/v1/depth?symbol=BTCUSDT&limit=50

Query params

Name	Type	Required	Default	Notes
symbol	string	yes	—	BTCUSDT (aliases accepted, see Symbols).
limit	integer	no	500	5, 10, 20, 50, 100, 500, 1000.

Response — 200

{
  "lastUpdateId": 1714261234567,
  "E": 1714261234567,
  "T": 1714261234567,
  "bids": [["60000.50", "0.123"], ["60000.40", "0.500"]],
  "asks": [["60001.00", "0.250"], ["60001.10", "0.300"]]
}

Field	Notes
lastUpdateId	Filled with the current timestamp (ms), not a monotonic update id. Do not use it for sequence-gap detection; use the orderbook: WebSocket channel for live state.
E / T	Event / transaction time, same value as lastUpdateId.
bids / asks	[price, qty] strings; bids descending, asks ascending.

Errors

HTTP	code	msg
400	-1121	Invalid symbol.
500	-1000	Order book unavailable.