One checked payment. A traceable receipt.

Mercenta separates the agent wallet, Circle Gateway balance and prepaid commerce account. Funding Gateway is not a sale and does not increase revenue. Digital goods remain simulated on this testnet release.

Verified platform funding

The separate demo agent EOA is 0x83758C71386c873d5c518251613Bf340f5BD558d on Arc Testnet, chain 5042002, Gateway domain 26.

• Deposit: 0.100000 test USDC.
• Total gas for approval plus deposit: 0.003574125 test USDC, within the approved 0.020000 cap.
• Inspect exact approval.
• Inspect confirmed deposit.

These are real testnet transfers, not a paid service request, customer sale or hackathon traction claim. Balances can change; use the authenticated application for current RPC/API readings.

Custody and control

This integration uses a server-managed local EOA, not a Circle MPC wallet. The signing key is kept outside source and frontend bundles, with restricted access. Existing Circle wallets and their entity-secret registration are not changed.

Execution is off until an approved service is configured and activation checks pass. A chat message does not spend funds. Backend limits are application controls, not onchain delegated spending authority.

Never paste private keys, seed phrases or provider credentials into agent chat. Use test assets only; this release is not independently audited for mainnet custody.

Payment lifecycle

1. Select a fixed operator-approved HTTPS service.
2. Fetch its x402 v2 quote without making a payment.
3. Validate Arc Testnet, canonical USDC/Gateway addresses, recipient and exact amount.
4. Review the amount and recipient and explicitly confirm.
5. Check available Gateway funds and reserve the rolling-day budget.
6. Sign only the bounded authorization and persist it before the paid request.
7. Treat queued or uncertain requests as pending; reconcile the original nonce rather than making a replacement payment.
8. Mark settlement only after attributed Circle transfer evidence and a successful canonical Arc receipt with confirmations.

Defaults: at most 0.010000 USDC per payment, 0.100000 USDC per rolling day, and a five-minute quote expiry. No arbitrary URL, recipient, mainnet chain or calldata from chat is accepted.

Mercenta-owned demo service

Ask Prepare a paid margin report in Agent Chat. This prepares an idempotent quote only; exact owner confirmation is separate. The fixed service is mercenta-margin-report at 0.001000 test USDC, paid to the configured Mercenta receiver. It is our own declared margin scenario, not an external supplier or verified customer sale.

The seller uses the official Circle facilitator, independently verifies EIP-712 scope/signature and reserves the nonce durably before settlement. Uncertain requests are reconciled, never re-settled automatically. Original-resource recovery uses the same authorization in cached-only mode and cannot initiate settlement.

Account API

All routes require the normal authenticated account proxy. Wallet addresses alone are not authentication.

Service output is rendered as escaped text. It is not executed or treated as an instruction to the agent.

What is not connected

No live Earn/APY, mainnet spending, automatic Gateway deposits, unrestricted autonomous purchases or guaranteed supplier fulfilment is implied. If no approved Arc Testnet service is available, the service list stays empty; mainnet services are not silently substituted.

Sources

• Circle nanopayments buyer quickstart.

• Gateway nanopayments SDK.

• Gateway technical guide.

• Official Circle seller quickstart.

• Seller reconciliation.