Cross-venue mark-price spread scan for crypto perpetuals — where the same perp trades at d

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x1538726707212F4dB3EB67cEc0910422A310475c",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "3000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "method": "GET",
        "queryParams": {
          "limit": {
            "description": "Max results. Default 50, max 100.",
            "required": false,
            "type": "integer"
          },
          "min_diff_bps": {
            "description": "Threshold in bps. Default 10.",
            "required": false,
            "type": "number"
          }
        },
        "type": "http"
      },
      "output": {
        "example": {
          "count": 1,
          "min_diff_bps": 10,
          "opportunities": [
            {
              "max_price": 0.0855,
              "max_venue": "mexc",
              "mid_price": 0.0853,
              "min_price": 0.0851,
              "min_venue": "binance",
              "spread_bps": 46.89,
              "ticker": "DOGE",
              "updated_at": "2026-05-26T17:03:09Z",
              "venues_count": 14
            }
          ]
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "properties": {
            "method": {
              "type": "string"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type",
            "method"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

curl "https://api.usenami.io/v1/perp/arbitrage/price"
# -> 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/perp/arbitrage/price");
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/perp/arbitrage/price")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header