Iv Surface

{
  "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"
    }
  ]
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://cryptyx.ai/api/iv-surface?asset='

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://cryptyx.ai/api/iv-surface?asset=' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.05 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.05" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.05 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fcryptyx.ai%2Fapi%2Fiv-surface
const res = await pay("https://cryptyx.ai/api/iv-surface?asset=");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.05 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.05"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://cryptyx.ai/api/iv-surface?asset=")
    print(res.status_code, res.text)