Class Market Price

{
  "age_s": 41,
  "as_of": "2026-10-11T18:20:00.000Z",
  "bar": {
    "c": 2538.81,
    "h": 2539.1,
    "l": 2538.6,
    "o": 2538.88,
    "t": 1791742740,
    "tf": "1m",
    "v": 12.4
  },
  "class": "market.price",
  "digest": "9f2c…",
  "fresh": true,
  "ok": true,
  "price_usd": 2538.81,
  "reference": {
    "age_s": 600,
    "off_pct": 0.02,
    "source": "Chainlink ETH / USD on Base",
    "usd": 2539.4
  },
  "replay": "https://clob.taifoon.dev/tape/v1/candles/ETH/1m?from=1791742740&to=1791742799",
  "source": "the Taifoon venue tape (https://clob.taifoon.dev/tape/v1/candles/ETH/1m): the close of the last closed 1-minute bar",
  "symbol": "ETH"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://coord.taifoon.dev/v1/x402/class/market.price?symbol=ETH'

# 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://coord.taifoon.dev/v1/x402/class/market.price?symbol=ETH' \
  | 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 $0.003 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.003" });
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 $0.003 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fcoord.taifoon.dev%2Fv1%2Fx402%2Fclass%2Fmarket.price
const res = await pay("https://coord.taifoon.dev/v1/x402/class/market.price?symbol=ETH");
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 $0.003 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.003"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://coord.taifoon.dev/v1/x402/class/market.price?symbol=ETH")
    print(res.status_code, res.text)