Open-interest delta for one crypto perpetual on one venue — current OI against OI N hours

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

{
  "bazaar": {
    "info": {
      "input": {
        "method": "GET",
        "queryParams": {
          "lookback_hours": {
            "description": "Hours to look back. Default 24, max 168.",
            "required": false,
            "type": "integer"
          },
          "ticker": {
            "description": "Base ticker. Required.",
            "required": true,
            "type": "string"
          },
          "venue": {
            "description": "Venue name. Required.",
            "required": true,
            "type": "string"
          }
        },
        "type": "http"
      },
      "output": {
        "example": {
          "current_oi": 98650.31,
          "current_ts": "2026-05-31T16:00:00Z",
          "delta_pct": 3.83,
          "lookback_hours": 24,
          "past_oi": 95012.5,
          "past_ts": "2026-05-30T16:00:00Z",
          "ticker": "BTC",
          "venue": "binance"
        },
        "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/oi-delta"
# -> 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/oi-delta");
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/oi-delta")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header