2026-07-01 · agentmail

x402 + Sanctions: Architecture Guide for Compliant Agent Payments

Architecture pattern for combining x402 micropayments with OFAC sanctions screening in a single agent payment flow.

The x402 protocol lets AI agents pay for API calls with tiny USDC payments. As agents begin spending autonomously, compliance must sit in the same path. Here is the architecture pattern for combining x402 payments with OFAC sanctions screening.

The problem

Without a sanctions gate, an agent using x402 can pay a sanctioned entity. The payment goes through, the service delivers, and the operator discovers the violation when OFAC asks. Worse the x402 transaction is on-chain and permanent.

The architecture

Your agent payment pipeline should follow this order: (1) Receive the counterparty wallet or identifier, (2) Call agentmail sanctions check, (3) If clean, proceed to x402 payment, (4) If flagged, return error and log to audit trail, (5) Store the screen result hash with the payment record.

Code pattern

async function payWithCompliance(recipientWallet, amount) {
  // 1. Screen the recipient
  const screen = await fetch(
    `https://sanctionsai.dev/sanctions?wallet=${recipientWallet}`
  ).then(r => r.json());
  
  // 2. Halt if flagged
  if (!screen.clean) {
    await auditLog("BLOCKED", recipientWallet, screen);
    throw new Error("Sanctions check failed");
  }
  
  // 3. Proceed with x402 payment
  const payment = await x402.transfer({
    to: recipientWallet,
    amount: amount,
    token: "USDC"
  });
  
  // 4. Log the paired record
  await auditLog("PAID", recipientWallet, { screen, payment });
}

Why this pattern matters

If OFAC ever asks about a payment, you can produce: the screen result (proves you checked before paying), the payment record (proves the counterparty), and the timestamp chain (proves the order). That combination is the difference between a mitigated violation and a maximum penalty.

agentmail supports x402 natively for the check itself. See the docs for the x402 pricing tier ($0.05 per check).