> ## Documentation Index > Fetch the complete documentation index at: https://docs.sfcompute.com/llms.txt > Use this file to discover all available pages before exploring further. # Orderbook > Visibility into the orderbook The orderbook is the live record of every standing buy and sell order on the market. Each row is one order: its side, how many nodes, what hardware, which delivery window, and the price the order would take. Conceptually: Orderbook with three example resting orders: a Buy for 8 H100s on Sep 1 9am to Sep 4 5pm at up to $1.42/node-hr, a Sell for 4 B200s on the same window at $1.38 minimum, and a Buy for 16 H200s on Oct 15 12am to Oct 22 12am at up to $0.95. The trading engine matches buys against sells continuously. Orders that haven't matched yet are visible to anyone querying the book. These endpoints expose that view. Three endpoints under `/preview/v2/orderbook/`: * [`/windows`](#windows) — enumerate active delivery windows in a time range. * [`/quote`](#quote) — top of book (best bid + best ask) for one exact window. * [`/depth`](#depth) — full depth of book at every price level for one exact window. `/windows` is the entry point when you don't already know the exact window you want; the other two price a specific window you've picked. The hardware filter is `?requirements=key:value`, e.g. `accelerator_type:H100`, `zone:richmond`, or `accelerator_type:H100,H200;zone:richmond` to combine. Each endpoint aggregates across every cluster whose orders satisfy the filter. All timestamps are Unix epoch seconds. Field names use the `_at` suffix. ## Windows Enumerate every delivery window that currently has resting orders matching the requirements filter, within a time range. Three example delivery windows displayed as horizontal bars on a Sep 1 to Sep 29 time axis, each showing its bid and ask counts. ```json theme={null} GET /preview/v2/orderbook/windows?requirements=zone:richmond&range_start_at=1777507200&range_end_at=1780099200 { "object": "list", "requirements": { "zone": ["richmond"] }, "range_start_at": 1777507200, "range_end_at": 1780099200, "cursor": null, "has_more": false, "data": [ { "start_at": 1777507200, "end_at": 1778112000, "duration_hours": 168, "total_bid_order_count": 3, "total_ask_order_count": 5, "total_bid_node_count": 12, "total_ask_node_count": 18, "best_bid": { "dollars_per_node_hour": "1.38", "node_count": 4 }, "best_ask": { "dollars_per_node_hour": "1.42", "node_count": 2 } }, { "start_at": 1777593600, "end_at": 1778198400, "duration_hours": 168, "total_bid_order_count": 0, "total_ask_order_count": 1, "total_bid_node_count": 0, "total_ask_node_count": 8, "best_ask": { "dollars_per_node_hour": "1.35", "node_count": 8 } } ] } ``` A window is included when it has at least one resting order matching the filter and falls entirely within the range. `best_bid` / `best_ask` are omitted when that side is empty. Sorted ascending by start time, cursor-paginated. `limit` defaults to 50 and caps at 200; range capped at 365 days. ## Quote Top of book for one exact window. Best bid, best ask. A vertical price ladder showing best ask of $1.42 with 2 nodes above best bid of $1.38 with 4 nodes, with a vertical bracket between them labeled spread $0.04. ```json theme={null} GET /preview/v2/orderbook/quote?requirements=zone:richmond&start_at=1777507200&end_at=1778112000 { "requirements": { "zone": ["richmond"] }, "start_at": 1777507200, "end_at": 1778112000, "requested_at": 1777426010, "best_bid": { "dollars_per_node_hour": "1.38", "node_count": 4 }, "best_ask": { "dollars_per_node_hour": "1.42", "node_count": 2 } } ``` Each side carries a `node_count`: the total nodes available at that rate, aggregated across every resting order on that side. ## Depth Depth of book aggregated by per-node-hour rate across every cluster matching the requirements filter. Cluster identity is collapsed away. Level II ladder showing two ask price levels above the spread and three bid price levels below, with horizontal bars whose lengths encode the node count at each price. ```json theme={null} GET /preview/v2/orderbook/depth?requirements=zone:richmond&start_at=1777507200&end_at=1778112000&depth=20 { "requirements": { "zone": ["richmond"] }, "start_at": 1777507200, "end_at": 1778112000, "requested_at": 1777426010, "bids": [ { "dollars_per_node_hour": "1.38", "node_count": 4 }, { "dollars_per_node_hour": "1.37", "node_count": 6 } ], "asks": [ { "dollars_per_node_hour": "1.42", "node_count": 2 }, { "dollars_per_node_hour": "1.43", "node_count": 5 } ] } ``` Bids descending by rate (best bid first); asks ascending. Orders at the same per-node-hour rate collapse into one level. `depth` defaults to 20 and caps at 100 per side.