Latest-day Deribit IV term structure for one asset — per-tenor ATM IV, 25-delta risk rever

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x0cD2c9724F185a029101b4AEACf3F114415c394f",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "50000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "method": "GET",
        "queryParams": {
          "asset": ""
        },
        "type": "http"
      },
      "output": {
        "example": {
          "asof_day": "2026-06-18",
          "pcr": {
            "oi_call": 50179.3,
            "oi_put": 42150.6,
            "pcr": 0.84
          },
          "term_structure": [
            {
              "atm_iv": 0.482,
              "bf_25d": 0.012,
              "iv_25c": 0.473,
              "iv_25p": 0.491,
              "rr_25d": -0.018,
              "tenor": "7d"
            },
            {
              "atm_iv": 0.515,
              "bf_25d": 0.019,
              "iv_25c": 0.503,
              "iv_25p": 0.527,
              "rr_25d": -0.024,
              "tenor": "30d"
            },
            {
              "atm_iv": 0.548,
              "bf_25d": 0.026,
              "iv_25c": 0.532,
              "iv_25p": 0.563,
              "rr_25d": -0.031,
              "tenor": "90d"
            }
          ]
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "properties": {
                "asset": {
                  "description": "Asset symbol (uppercased server-side). Deribit scope: BTC or ETH.",
                  "type": "string"
                }
              },
              "required": [
                "asset"
              ],
              "type": "object"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

curl "https://cryptyx.ai/api/iv-surface"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://cryptyx.ai/api/iv-surface");
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://cryptyx.ai/api/iv-surface")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header