Fetch orderbook
Orderbook
fetch_orderbook
Fetch the full-depth L2 orderbook (bids + asks) for one asset_id.
GET
Fetch orderbook
Fetch the full-depth L2 orderbook (bids + asks) for one
asset_id.Query Parameters
Response
Success.
Full-depth L2 orderbook for one asset.
Ask levels, sorted ascending by price.
The orderable asset — Kalshi market ticker or Polymarket CTF token id (e.g. "KXBTCD-25APR1517").
Bid levels, sorted descending by price.
Polymarket book-state hash for replay integrity; null on Kalshi.
Monotonic sequence id from upstream; null when not provided.
Required range:
x >= 0Upstream snapshot time in UTC (e.g. "2026-04-25T12:00:00Z").

