Book snapshot
Every active listing in one response, plus seq (an int64), the sequence number of the last WebSocket event published before the snapshot was taken. Use it to seed a local book: buffer WebSocket events, load the snapshot, drop events with seq <= the snapshot's, apply the rest. Optional app_id filter, worth passing since it cuts a large payload down to the game you trade. Rows are deliberately lean: price/amount state only, no per-game item fields; item detail comes from GET /public/v1/listings or the listing.created events. Snapshots are cached for 10 seconds and carry an ETag, so a repeat call within that window is free; the cached seq is the one the snapshot is valid at, which is all the sync protocol needs. Heavily rate-limited: it exists for (re)synchronization, not polling. If you want item prices rather than individual live listings, use GET /public/v1/prices/all instead, which is far cheaper for both of us.
Authorization
apiKey API key generated from your account settings on the website. Send as Authorization: Bearer csd_....
In: header
Query Parameters
^[1-9]\d*$Response Body
application/json
curl -X GET "https://example.com/public/v1/book"{ "seq": 0, "listings": [ { "id": 1, "app_id": 1, "market_hash_name": "string", "price": -9007199254740991, "amount": -9007199254740991, "commodity": true, "created_at": "2019-08-24T14:15:22Z" } ]}Your account GET
Account snapshot: CS Deals user id, linked `steam_id`, display name, and balance in cents.
Single listing GET
One active listing by its id, with the same per-game item fields as `GET /public/v1/listings`. Use it to re-check a listing you already know about — after a `listing.price_changed` event, or right before a purchase — instead of paging the whole book. Returns `404 LISTING_NOT_FOUND` once the listing is sold or delisted, which is the cheapest way to confirm a listing is gone.