ToolVet
75trust / 100

Prove

by Payment Receipt/Settlement Proof in Onchain & crypto

x402 APIPassing, checked 4 h ago

Payment receipt and settlement proof for x402 and agent payments, by Liquid Logic X. Input: a Base USDC tx hash (optional memo). Output: JSON proof recorded onchain on Arc mainnet (proofId, from/to/amount, Arc tx, refId) plus a public verify link anyone can check. $0.02 USDC on Base, charged only when a proof is returned. Your paying wallet must be the tx sender or recipient. Liquid Logic X also records proofs on Tempo mainnet. Site: https://liquidlogicx.com

GET
https://audit.liquidlogicx.com/api/prove
Price
$0.02
per call in USDC
Uptime
100%
last 30 days
Response time
312 ms
1.1 s slowest 5%
Last check
Passed
4 h ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed · Watch with other listings

How to call it

GET https://audit.liquidlogicx.com/api/prove

Each call costs $0.02 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

GET https://audit.liquidlogicx.com/api/prove?memo=invoice-42&txHash=0x93a15735c5b82fb8c9fdc0f7db5d56916a14f6ee4ef343000a29fd55c4bcaf4c

Parameters

ParameterTypeRequiredDescription
memostringNoOptional plain-text note stored on-chain with the proof (printable ASCII, max 64 chars). Public.
txHashstringYesBase mainnet (eip155:8453) transaction hash of a USDC payment (must contain a Transfer from Base USDC 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). Your paying wallet must be its from or to.

Example response

The provider's example. We can't check it without paying.

{
  "arc": {
    "chain": "eip155:5042",
    "contract": "0x1de52cbc4490a7873ef007e51cb91a5b374facb1",
    "txHash": "0x2bb316073c034140d74d73ca67ad2b71bfaaa9dea531d69290a16efdd0f10bbe"
  },
  "memo": "llx-self-test-0.001",
  "proofId": 1,
  "recordedAt": "2026-09-22T15:32:28.000Z",
  "refId": "0xe6db5a86740c0e40943c06268bda4e09b45ac0a45fd6c5d7b7f2550e19e0c50e",
  "source": {
    "amountUsdc": "0.001",
    "chain": "eip155:8453",
    "from": "0xEA24bafbBAF6d7Ba58bE860EE906f0Fe533d167D",
    "timestamp": "2026-09-15T20:38:57.000Z",
    "to": "0x147991A1c25e78f6D9225d2dBA61eD93A6158c7b",
    "txHash": "0x93a15735c5b82fb8c9fdc0f7db5d56916a14f6ee4ef343000a29fd55c4bcaf4c"
  },
  "status": "recorded",
  "verifyUrl": "https://proofs.liquidlogicx.com/proofs?q=0xe6db5a86740c0e40943c06268bda4e09b45ac0a45fd6c5d7b7f2550e19e0c50e"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.02.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://audit.liquidlogicx.com/api/prove?memo=invoice-42&txHash=0x93a15735c5b82fb8c9fdc0f7db5d56916a14f6ee4ef343000a29fd55c4bcaf4c'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://audit.liquidlogicx.com/api/prove?memo=invoice-42&txHash=0x93a15735c5b82fb8c9fdc0f7db5d56916a14f6ee4ef343000a29fd55c4bcaf4c' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Faudit.liquidlogicx.com%2Fapi%2Fprove
const res = await pay("https://audit.liquidlogicx.com/api/prove?memo=invoice-42&txHash=0x93a15735c5b82fb8c9fdc0f7db5d56916a14f6ee4ef343000a29fd55c4bcaf4c");
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://audit.liquidlogicx.com/api/prove?memo=invoice-42&txHash=0x93a15735c5b82fb8c9fdc0f7db5d56916a14f6ee4ef343000a29fd55c4bcaf4c")
    print(res.status_code, res.text)

Security scan

No findings

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Recent checks

WhenResultHTTPTimePrice
4 h agoPassed402398 ms$0.02
10 h agoPassed402415 ms$0.02
15 h agoPassed402290 ms$0.02
20 h agoPassed402254 ms$0.02
25 h agoPassed402469 ms$0.02
Show 10 older checks
29 h agoPassed402284 ms$0.02
34 h agoPassed402294 ms$0.02
39 h agoPassed402291 ms$0.02
43 h agoPassed4021.1 s$0.02
2 days agoPassed402478 ms$0.02
2 days agoPassed4021.1 s$0.02
2 days agoPassed402302 ms$0.02
3 days agoPassed402259 ms$0.02
3 days agoPassed402370 ms$0.02
3 days agoPassed402278 ms$0.02