ONE ATOMIC USDC · BASE · DIRECT WALLET

The smallest possible nonzero USDC checkout.

Pay exactly one atomic unit of official Base USDC—0.000001 USDC—through a verified direct wallet transfer. Browser buyers can optionally prepare it with an injected wallet or pay manually without connecting one. Verified buyers receive a permanent, shareable public purchase receipt. Automated x402 uses 0.001 USDC because public facilitators enforce that settlement floor.

1 atomic directPermanent receiptx402 floor: 0.001

Buy for 0.000001 USDC and get a permanent receipt

Inspect the settlement-safe 0.001 USDC x402 canary →

Open the independent 402 Index re-probe: 0.001 USDC, amount 1000 →

NO X402 CLIENT?Direct Base wallet path

BROWSER CHECKOUT

Pay one atomic unit from any Base wallet.

Create a 30-minute invoice and send exactly 0.000001 official USDC on Base. Use an optional injected wallet for one-click transaction preparation, or pay manually without connecting a wallet. No account, seller signature, private key, or x402 client.

01 · INVOICE

One POST

Create a 30-minute, no-input invoice at /api/x402-one-atomic/invoice.

02 · PAY

One atomic unit

Send exactly 1 atomic unit of official six-decimal Base USDC from the buyer wallet.

03 · VERIFY

Public transaction

Submit the public Base transaction hash; the server checks the successful official-USDC Transfer.

04 · PROVE

Keep the receipt

The permanent receipt records the exact seller, token, amount, time, invoice, and explorer evidence.

TWO HONEST FLOORS

One atomic direct; 1000 atomic through hosted x402.

USDC itself can represent one atomic unit, so the direct checkout uses exactly that amount. Hosted facilitators currently enforce a 0.001 USDC settlement floor, so the automated x402 canary uses 1000 atomic units instead of advertising an offer that cannot settle.

{
  "product": "BountyWorth Facilitator-Floor Base x402 Settlement Canary",
  "paid": true,
  "network": "eip155:8453",
  "amountAtomic": "1000",
  "amountUsdc": "0.001",
  "facilitatorFloor": true,
  "settlementEvidence": "Read PAYMENT-RESPONSE"
}

PERMANENT PUBLIC PROOF

A purchase receipt that remains shareable after the checkout closes.

Every verified direct purchase gets a stable receipt URL keyed by its public Base transaction hash. It records the official USDC contract, exact seller and amount, paid time, invoice ID, and independent explorer link. Reading the receipt is free.

GET /api/x402-one-atomic/receipt?transactionHash=0x…

{
  "paid": true,
  "protocol": "direct-base-usdc",
  "network": "eip155:8453",
  "amountAtomic": "1",
  "transactionHash": "0x…",
  "explorer": "https://base.blockscout.com/tx/0x…"
}

EXACT SCOPE

A direct payment canary, not a faucet or refund loop.