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.
A u64-domain value rendered as a decimal string.
^[0-9]+$"182390"
Opaque pagination cursor from a prior response; omit for the first page.
Page size.
1 <= x <= 1000