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Usenami Top-of-Book Orderbook (Single Venue)
x402
Usenami Top-of-Book Orderbook (Single Venue) is a paid API for AI agents from api.usenami.io, paid per call via x402, $0.001/call, status down (last checked 2026-10-17).
Returns the best bid, best ask, and spread for a single crypto perpetual on a specific CEX or DEX venue in real time.
Price / call$0.001
Success—
StatusDown
How this service works
Top-of-book for one crypto perpetual on one venue — best bid, best ask and the spread between them. Covers CEX and DEX perp venues: Binance, Bybit, OKX, Hyperliquid, Paradex, Drift and others.
Output
Returns the top-of-book for the requested venue and symbol: the best bid price, best ask price, and the spread (ask minus bid) between them, reflecting real-time market conditions.
Example use cases
Live spread monitoring for arbitrage
“What's the top-of-book spread for ETH-PERP on Binance right now? I want to see the best bid and ask so I can check if there's an arbitrage opportunity.”
Pre-trade best price check
“Before I enter a long on SOL-PERP on Bybit, can you pull the current best ask price and spread from the orderbook?”
DEX perp liquidity snapshot
“What's the best bid and ask for BTC-PERP on Drift right now? I'm trying to understand how tight the DEX spread is compared to a CEX.”
Technical details
Endpoint
GEThttps://api.usenami.io/v1/orderbook/:venue/:symbol/top?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, low-cost, single-venue top-of-book snapshot for a specific crypto perpetual — ideal for pre-trade checks, spread monitoring, or real-time price feeds. If you need cross-venue spread comparison or sized-depth slippage at specific notional sizes, use the corresponding Usenami sibling endpoints instead.
Side effects
- Unknown venue name returns an error — must use a supported venue slug (e.g. binance, bybit, hyperliquid, drift)
- Invalid or unsupported symbol returns an error
- Network or exchange connectivity issues may cause stale or missing data
- Payment failure (x402 protocol) blocks the response if USDC is not available
Tags
x402
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