Machine Payments (x402 & MPP)

import { x402Client } from 'x402';

const client = new x402Client({ wallet, network: 'base' });
// Automatically answers the 402 and retries with X-PAYMENT
const res = await client.fetch(
  'https://api.credprotocol.com/api/v2/score/address/vitalik.eth'
);
console.log(await res.json());

import base64, requests

url = "https://api.credprotocol.com/api/v2/score/address/vitalik.eth"
r = requests.get(url)
if r.status_code == 402:
    requirements = base64.b64decode(r.headers["X-PAYMENT-REQUIRED"])
    signed = sign_usdc_transfer(requirements)          # your wallet
    r = requests.get(url, headers={"X-PAYMENT": signed})
print(r.json(), r.headers.get("X-Payment-Transaction"))

import base64, json, requests, re

URL = "https://api.credprotocol.com/api/v2/score/address/vitalik.eth"

r = requests.get(URL)                                    # 402
challenges = parse_www_authenticate(r.headers["WWW-Authenticate"])
ch = next(c for c in challenges if c["method"] == "cred")

payload = {
    "walletAddress": WALLET,
    "walletSignature": sign_eip712_ownership(WALLET, ch),   # your wallet
    "timestamp": now_iso(),
    # optional: "eip3009Authorization": {...} for pull-payment settlement
}
credential = base64.urlsafe_b64encode(json.dumps(
    {"challenge": ch, "source": WALLET, "payload": payload}
).encode()).rstrip(b"=").decode()

r = requests.get(URL, headers={"Authorization": f"Payment {credential}"})
print(r.status_code, r.json())
print("receipt:", r.headers.get("Payment-Receipt"))

# 1. Read the tempo challenge from the 402
curl -si https://api.credprotocol.com/api/v2/score/address/vitalik.eth | grep -i www-authenticate

# 2. Send 10000 units of USDC on Tempo (chainId 4217) to the recipient in the challenge

# 3. Retry with the credential (challenge + payload with the tx hash), base64url-encoded
curl https://api.credprotocol.com/api/v2/score/address/vitalik.eth \
  -H "Authorization: Payment $CREDENTIAL"