Base Network Support

// Correct ✅
{
  chain: "base";
}
{
  chain: "base-sepolia";
}

// Wrong ❌
{
  chain: "BASE";
}
{
  chain: "Base";
}
{
  chain: "base_mainnet";
}

async function verifyPayment(txHash, chain, amount) {
  const response = await fetch("https://facilitator.0xmeta.ai/v1/verify", {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      "X-API-Key": "your_api_key",
      "Idempotency-Key": `verify_${txHash}`,
    },
    body: JSON.stringify({
      transaction_hash: txHash,
      chain: chain, // "base" or "base-sepolia"
      seller_address: YOUR_ADDRESS,
      expected_amount: amount,
    }),
  });

  return await response.json();
}

// Use with Base Mainnet
await verifyPayment("0x...", "base", "1000000000000000000");

// Use with Base Sepolia Testnet
await verifyPayment("0x...", "base-sepolia", "1000000000000000000");

{
  "chain": "base",
  "expected_amount": "1000000000000000000"  // 1 ETH
}

{
  "chain": "base-sepolia",
  "expected_amount": "1000000000000000000"  // 1 test ETH
}

{
  "chain": "base",
  "expected_token": null,  // null = native token
  "expected_amount": "1000000000000000000"
}

{
  "chain": "base",
  "expected_token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",  // USDC on Base
  "expected_amount": "1000000"  // 1 USDC (6 decimals)
}

const config = {
  development: {
    chain: "base-sepolia",
    sellerAddress: process.env.DEV_ADDRESS,
  },
  production: {
    chain: "base",
    sellerAddress: process.env.PROD_ADDRESS,
  },
};

const { chain, sellerAddress } = config[process.env.NODE_ENV];

const SUPPORTED_CHAINS = [
  { id: "base", name: "Base Mainnet", native: "ETH" },
  { id: "base-sepolia", name: "Base Sepolia", native: "ETH" },
];

// Let user select chain
<select onChange={(e) => setChain(e.target.value)}>
  {SUPPORTED_CHAINS.map((chain) => (
    <option key={chain.id} value={chain.id}>
      {chain.name}
    </option>
  ))}
</select>;

function getChainDecimals(chain, isNativeToken) {
  if (isNativeToken) {
    return 18; // ETH uses 18 decimals
  }

  // Token-specific decimals
  const tokenDecimals = {
    USDC: 6,
    USDT: 6,
    DAI: 18,
  };

  return tokenDecimals[tokenName] || 18;
}

const response = await verifyPayment(txHash, chain, amount);

console.log(`Payment verified on ${chain}`);
console.log(`View on explorer: ${getExplorerUrl(chain, txHash)}`);

function getExplorerUrl(chain, txHash) {
  const explorers = {
    base: "https://basescan.org/tx/",
    "base-sepolia": "https://sepolia.basescan.org/tx/",
  };

  return explorers[chain] + txHash;
}