Implied volatility surface for BTC and ETH from Deribit options (public API, no auth)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x36038e1d712c5e39f35952164ec58ec2b96caee7",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "30000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "method": "GET",
        "pathParams": {},
        "queryParams": {},
        "type": "http"
      },
      "output": {
        "example": {
          "as_of": "2026-01-01T00:00:00.000Z",
          "asset": "BTC-USD",
          "atm_iv": 42.8,
          "available": true,
          "data_source": "deribit",
          "disclaimer": "Options data from Deribit public API. Informational only.",
          "iv_history_days": 45,
          "iv_percentile": 61.2,
          "iv_rank": 58.3,
          "iv_rank_note": "Based on 45 trading days of ATM IV history.",
          "max_pain_strike": 60000,
          "skew_25d": 3.8,
          "skew_note": "25-delta risk reversal: put IV minus call IV at BS-approximated 25-delta strikes.",
          "term_structure": [
            {
              "atm_iv": 44.2,
              "days_to_expiry": 3,
              "expiry": "5JUL26",
              "label": "weekly"
            },
            {
              "atm_iv": 42.5,
              "days_to_expiry": 29,
              "expiry": "31JUL26",
              "label": "1m"
            },
            {
              "atm_iv": 40.1,
              "days_to_expiry": 85,
              "expiry": "25SEP26",
              "label": "3m"
            }
          ],
          "term_structure_shape": "contango",
          "underlying_price": 61200,
          "vol_regime": "normal",
          "vol_regime_note": "ATM IV 42.8%, term structure contango.",
          "wing_10d_call_iv": 38.5,
          "wing_10d_put_iv": 49.2
        },
        "example_kind": "illustrative_schema_only",
        "example_note": "Placeholder values and timestamps, not market data.",
        "type": "json"
      }
    },
    "routeTemplate": ":var1",
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "pathParams": {
              "type": "object"
            },
            "queryParams": {
              "properties": {},
              "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://kronossignals.com/api/v1/options-iv/btc"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://kronossignals.com/api/v1/options-iv/btc");
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://kronossignals.com/api/v1/options-iv/btc")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header