Top-of-book for one crypto perpetual on one venue — best bid, best ask and the spread betw

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x1538726707212F4dB3EB67cEc0910422A310475c",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "method": "GET",
        "pathParams": {
          "symbol": "BTC",
          "venue": "hyperliquid"
        },
        "type": "http"
      },
      "output": {
        "example": {
          "ask_price": 104251,
          "ask_size": 0.8,
          "bid_price": 104250.5,
          "bid_size": 1.2,
          "symbol": "BTC-PERP",
          "timestamp": "2026-05-17T20:00:00Z",
          "venue": "hyperliquid"
        },
        "type": "json"
      }
    },
    "routeTemplate": "/v1/orderbook/:venue/:symbol/top",
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "properties": {
            "method": {
              "type": "string"
            },
            "pathParams": {
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type",
            "method"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

curl "https://api.usenami.io/v1/orderbook/:venue/:symbol/top"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://api.usenami.io/v1/orderbook/:venue/:symbol/top");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

import httpx
res = httpx.get("https://api.usenami.io/v1/orderbook/:venue/:symbol/top")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header