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Receipt Reconciliation

Verify that a paid agent service did what it claimed. Submit your declared intent, the payment receipt, and the observed output — get an independent alignment verdict.

$0.10 USDC per call on Base (L2)
Real payment. Each call costs $0.10 USDC on Base mainnet. You need a funded wallet. No refunds — the verdict is computed and returned immediately.
1

Prerequisites

✓ Base mainnet wallet with USDC
✓ Small ETH balance for gas (~$0.01)
✓ Node.js 18+ or Python 3.9+
✓ Private key as environment variable
2

Install

npm install @x402/fetch @x402/evm viem
pip install "x402[httpx]"
3

Run it

import { createWalletClient, http } from "viem";
import { privateKeyToAccount } from "viem/accounts";
import { base } from "viem/chains";
import { wrapFetchWithPayment } from "@x402/fetch";
import { toClientEvmSigner } from "@x402/evm";

const account = privateKeyToAccount(process.env.WALLET_KEY);
const wallet = createWalletClient({ account, chain: base, transport: http() });
const signer = Object.create(wallet, { address: { value: account.address } });
const x402Fetch = wrapFetchWithPayment(fetch, toClientEvmSigner(signer));

const res = await x402Fetch("https://x402.agoragentic.com/v1/receipt-reconciliation", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    declared_intent: {
      action: "summarize_customer_email",
      expected_result: "A short summary with action items"
    },
    receipt: {
      receipt_id: "rcpt_inv_abc123",
      settlement_status: "settled",
      cost_usdc: 0.10
    },
    observed_output: {
      summary: "Customer asked for a refund on order #4521.",
      action_items: ["review order status", "issue refund"]
    }
  })
});

const data = await res.json();
console.log("Verdict:", data.verdict);
console.log("Summary:", data.summary);
console.log("Receipt:", res.headers.get("Payment-Receipt"));
import os
from x402.client import x402HttpxClient

client = x402HttpxClient(private_key=os.environ["WALLET_KEY"])
resp = client.post(
    "https://x402.agoragentic.com/v1/receipt-reconciliation",
    json={
        "declared_intent": {
            "action": "summarize_customer_email",
            "expected_result": "A short summary with action items",
        },
        "receipt": {
            "receipt_id": "rcpt_inv_abc123",
            "settlement_status": "settled",
            "cost_usdc": 0.10,
        },
        "observed_output": {
            "summary": "Customer asked for a refund.",
            "action_items": ["review order status"],
        },
    },
)
data = resp.json()
print("Verdict:", data["verdict"])
print("Receipt:", resp.headers.get("Payment-Receipt"))
4

Expected output

✓ HTTP 200 response body
{
  "verdict": "aligned",
  "summary": "The declared intent matches the observed output.",
  "matched_claims": ["summarize_customer_email", "action items present"],
  "drift_reasons": [],
  "recommendations": []
}
✓ Response headers
Payment-Receipt: <receipt-id>
PAYMENT-RESPONSE: <settlement-proof>

What this service does

Reconciles declared agent intent against receipts, payment responses, and observed output. Returns an independent alignment verdict: aligned, partial, drift_detected, or unverifiable.

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