Verify x402 settlement

Confirm a USDC payment actually settled: given a tx hash (and network), returns whether it succeeded and the USDC transfers it contains (from, to, amount). Send GET /api/x402-verify with the required field hash and pay $0.004 per call over x402 or MPP (there is no free tier). It returns a JSON object with hash, network, settled, status, transfers and 1 more.

Optionally check it paid a specific address at least a minimum amount. Read-only proof of payment. ?hash=0x…&network=base&to=0x…&min=0.001

Category: Payments & x402 · Tags: x402 verify settlement receipt usdc proof multichain

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Parameters

Example request

curl -i "https://agent402.tools/api/x402-verify?hash=0x09f85fcf1844d85277b8cce528efc8d25c6df632b1fed1c8337f078901a69562&network=base&min=0.001"

Without payment this returns HTTP 402 Payment Required with the exact price for x402-verify; any x402 v2 or MPP client pays it and retries.

Example response

{
  "hash": "0x09f85fcf1844d85277b8cce528efc8d25c6df632b1fed1c8337f078901a69562",
  "network": "base",
  "settled": true,
  "status": "success",
  "transfers": [
    {
      "from": "0x…",
      "to": "0x…",
      "usdc": "0.01"
    }
  ],
  "matched": true
}

From an MCP client

catalog.call {
  "slug": "x402-verify",
  "params": {
    "hash": "0x09f85fcf1844d85277b8cce528efc8d25c6df632b1fed1c8337f078901a69562",
    "network": "base",
    "min": 0.001
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for x402-verify; the stdio package pays it from a wallet or from AGENT402_CREDITS_KEY. Local install: npx -y agent402-mcp.

Errors and behavior

• hash is required. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example, so the caller can correct it.
• A paid call that ends in any status of 400 or above is not charged over x402, MPP or a prepaid credits key: settlement is cancelled when the tool fails. The exception is a Tempo push credential, a transfer the buyer sent before the call: it settles before the tool runs, so if the tool then fails the payment is recorded as a refund owed to the paying wallet.
• Wallet-only: this tool reaches the network or stored state, so it has no proof-of-work tier. A prepaid card-credits key issued earlier (Authorization: Bearer a402_...) also pays it.
• Cached: an identical request within 1d is answered from cache with X-Cache: hit.
• A POST with a JSON body to /api/x402-verify is served as this GET, with the body as the input.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again (an answer larger than 1 MB is not replayed).

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
client.setSpendControls?.(false); // keep your own spending ceiling in code
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/x402-verify?hash=0x09f85fcf1844d85277b8cce528efc8d25c6df632b1fed1c8337f078901a69562&network=base&min=0.001");

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