Cancel all orders
Cancel all of the caller’s resting orders (optionally scoped by
market_id / group_id). Maps to MASS_CANCEL (api.md §6.11). The
sequenced command is the acknowledgment — there is no summary event
and no count. The resulting CANCELED events stream on the WS user
channel.
Authorizations
The public API key (alphanumeric access_key string).
Request timestamp, Unix milliseconds (decimal). ±5000 ms replay window.
base64(HMAC-SHA256(secret, "timestamp\nMETHOD\npath?query\nbody")). For the WS handshake the body is empty and the path is /v1/ws.
Query Parameters
Restrict to one market; 0 or absent = all markets.
Restrict to one order group; 0 or absent = all groups.
Response
Cancel-all sequenced (api.md §6.11).
A bare sequenced-command acknowledgment (api.md §6.11).
A u64-domain value rendered as a decimal string (api.md §1).
^[0-9]+$"182390"