x402 endpoint live

Crypto Price Feed

A pay-per-call API that returns the current USD spot price for a crypto ticker. Payments are settled on Base mainnet via the x402 protocol using the PayAI facilitator.

Endpoint

GET https://v0-x402-endpoint.vercel.app/api/price?symbol=BTC

Price: $0.005 USDC
Network: base (mainnet)
Facilitator: facilitator.payai.network

How a buyer agent calls it

First request returns 402 Payment Required with the payment requirements. The buyer signs a payment, retries with the X-PAYMENT header, the facilitator settles, and the response is returned.

// Using x402-fetch in a buyer agent
import { wrapFetchWithPayment } from "x402-fetch"
import { privateKeyToAccount } from "viem/accounts"

const account = privateKeyToAccount(process.env.PRIVATE_KEY as `0x${string}`)
const fetchWithPay = wrapFetchWithPayment(fetch, account)

const res = await fetchWithPay(
  "https://v0-x402-endpoint.vercel.app/api/price?symbol=ETH",
  { method: "GET" }
)
const data = await res.json()
console.log(data)
// { symbol: "ETH", price_usd: 3421.55, timestamp: "...", source: "coinbase-spot" }

Response shape

{
  "symbol": "BTC",
  "price_usd": 67890.12,
  "timestamp": "2026-05-25T12:34:56.000Z",
  "source": "coinbase-spot"
}