# Usenami Orderbook Depth Quote — Single Venue/Symbol

> Usenami Orderbook Depth Quote — Single Venue/Symbol is a paid API for AI agents from api.usenami.io, paid per call via x402, $0.002/call, status down (last checked 2026-10-17).

Returns best bid/ask, per-side depth, and estimated slippage in basis points over mid for a specific crypto perpetual on a named exchange venue.

## Facts

- Endpoint: GET https://api.usenami.io/v1/orderbook/depth/:venue/:symbol?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: down
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/usenami-orderbook-depth-quote-single-venue-symbol-1fa3c106
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wzSUWeaiT1V3-1Y9TmcnB

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability usenami-orderbook-depth-quote-single-venue-symbol-1fa3c106
```

Example prompt: What's the orderbook depth and estimated slippage in basis points to fill $5,000 of BTC-PERP on Binance right now?

## When to prefer this

Use this endpoint when you need slippage cost in basis points and depth data for a single specific venue and symbol pair — ideal for pre-trade analysis, execution cost modeling, or deciding whether a particular venue is liquid enough. Use /v1/orderbook/multi-venue-slippage instead when you want to compare slippage across all venues simultaneously. Use the top-of-book endpoint if you only need best bid/ask without depth or slippage estimates.

## Known failure modes

- Unknown venue name returns 404 or error — must use exact venue identifiers from supported venue list
- Unsupported symbol returns empty or error response
- Book is temporarily unavailable for a venue, returning stale or null data
- size_usd above $10K cap may be rejected or clamped per DIS-022
- Network latency may cause slightly stale snapshot data in fast-moving markets

## How this service works

Depth quote for one crypto perp on ONE named venue: best bid/ask, depth per side, and est_slippage_for_size_usd_bps — the cost of filling size_usd here, in BASIS POINTS over the mid, not dollars. On a book deep enough to fill at the touch it equals half the spread and is the same for $1K/$5K/$10K; on a thinner book it grows with size. Equal values across sizes mean the book covers you, not that size_usd was ignored. All venues: /v1/orderbook/multi-venue-slippage. $10K cap per DIS-022.

## Output

Returns the best bid and ask prices, available liquidity depth per side of the book, and est_slippage_for_size_usd_bps — a pre-computed estimate of fill cost in basis points over the mid price. On deep books this equals roughly half the spread regardless of size; on thin books it increases with order size. Capped at $10K notional per call (DIS-022).

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/usenami-orderbook-depth-quote-single-venue-symbol-1fa3c106/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.usenami.io](https://www.zero.xyz/host/api.usenami.io/llms.txt)