Quickintel Scan

{
  "chain": "base",
  "tokenAddress": "0x..."
}

curl -sS -X POST "https://api.wallet.paysponge.com/api/x402/fetch" \
  -H "Authorization: Bearer $SPONGE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "url": "https://x402.quickintel.io/v1/scan/full",
    "method": "POST",
    "body": {
      "chain": "base",
      "tokenAddress": "0xa4a2e2ca3fbfe21aed83471d28b6f65a233c6e00"
    },
    "preferred_chain": "base"
  }'

const response = await fetch('https://frames.ag/api/wallets/{username}/actions/x402/fetch', {
  method: 'POST',
  headers: {
    'Authorization': `Bearer ${process.env.AGENTWALLET_API_TOKEN}`,
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    url: 'https://x402.quickintel.io/v1/scan/full',
    method: 'POST',
    body: { chain: 'base', tokenAddress: '0x...' }
  })
});
const scan = await response.json();

import { x402Fetch } from '@x402/fetch';
import { createWallet } from '@x402/evm';

// Use a DEDICATED wallet with only payment funds ($1-5 USDC)
// NEVER use your main wallet or trading wallet private key here
const wallet = createWallet(process.env.X402_PAYMENT_KEY);

const response = await x402Fetch('https://x402.quickintel.io/v1/scan/full', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({ chain: 'base', tokenAddress: '0x...' }),
  wallet,
  preferredNetwork: 'eip155:8453'
});

const scan = await response.json();

import { keccak256, toHex } from 'viem';
import { privateKeyToAccount } from 'viem/accounts';

// Use a DEDICATED wallet with only payment funds ($1-5 USDC)
const account = privateKeyToAccount(process.env.X402_PAYMENT_KEY);
const SCAN_URL = 'https://x402.quickintel.io/v1/scan/full';

// Step 1: Hit endpoint, get 402 with payment requirements
const scanBody = JSON.stringify({ chain: 'base', tokenAddress: '0x...' });
const initialRes = await fetch(SCAN_URL, {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: scanBody,
});

if (initialRes.status !== 402) throw new Error(`Expected 402, got ${initialRes.status}`);
const paymentRequired = await initialRes.json();

// Step 2: Find preferred network in accepts array
const networkInfo = paymentRequired.accepts.find(a => a.network === 'eip155:8453');
if (!networkInfo) throw new Error('Base network not available');

// Step 3: Sign EIP-712 TransferWithAuthorization
const nonce = keccak256(toHex(`${Date.now()}-${Math.random()}`));
const validBefore = BigInt(Math.floor(Date.now() / 1000) + 3600);

const signature = await account.signTypedData({
  domain: {
    name: networkInfo.extra.name,
    version: networkInfo.extra.version,
    chainId: 8453,
    verifyingContract: networkInfo.asset,
  },
  types: {
    TransferWithAuthorization: [
      { name: 'from', type: 'address' },
      { name: 'to', type: 'address' },
      { name: 'value', type: 'uint256' },
      { name: 'validAfter', type: 'uint256' },
      { name: 'validBefore', type: 'uint256' },
      { name: 'nonce', type: 'bytes32' },
    ],
  },
  primaryType: 'TransferWithAuthorization',
  message: {
    from: account.address,
    to: networkInfo.payTo,
    value: BigInt(networkInfo.amount),
    validAfter: 0n,
    validBefore,
    nonce,
  },
});

// Step 4: Build PAYMENT-SIGNATURE header
// CRITICAL: signature is a SIBLING of authorization, NOT nested inside it
// CRITICAL: value/validAfter/validBefore must be DECIMAL STRINGS
const paymentPayload = {
  x402Version: 2,
  scheme: 'exact',
  network: 'eip155:8453',
  payload: {
    signature,                         // ← Direct child of payload
    authorization: {
      from: account.address,
      to: networkInfo.payTo,
      value: networkInfo.amount,                  // Decimal string: "30000"
      validAfter: '0',                            // Decimal string
      validBefore: validBefore.toString(),         // Decimal string
      nonce,
    },
  },
};

const paymentHeader = Buffer.from(JSON.stringify(paymentPayload)).toString('base64');

// Step 5: Retry with payment
const paidRes = await fetch(SCAN_URL, {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'PAYMENT-SIGNATURE': paymentHeader,
  },
  body: scanBody,
});

const scan = await paidRes.json();