ToolVet
75trust / 100

Payment Proof

by Quartermaster Payment Proof in Onchain & crypto

x402 APIPassing, checked 2 h ago

Verify an x402 settlement on Base OR Solana: pass a 0x transaction hash or a base58 signature, confirm it succeeded, decode its USDC transfers (event logs on Base, net token-balance deltas on Solana), and optionally assert the receiving wallet and amount.

GET
https://quartermaster.surewhynot.app/v1/payment-proof
Price
$0.003
per call in USDC
Uptime
100%
last 30 days
Response time
706 ms
1.2 s slowest 5%
Last check
Passed
2 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://quartermaster.surewhynot.app/v1/payment-proof

Each call costs $0.003 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://quartermaster.surewhynot.app/v1/payment-proof?amount=0.001&hash=0x06be01596be1cb68d9b12a33946d2228a82eeb31016ab237825cec547017095f&payTo=0xc2a3...4083

Parameters

ParameterTypeRequiredDescription
amountstringNoOptional: assert the USDC amount (human decimal)
hashstringYesBase transaction hash to verify
payTostringNoOptional: assert USDC was received by this wallet

Example response

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

{
  "checks": {
    "amount_matches": true,
    "onchain_success": true,
    "paid_to_expected_wallet": true
  },
  "verdict": "verified"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.003.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://quartermaster.surewhynot.app/v1/payment-proof?amount=0.001&hash=0x06be01596be1cb68d9b12a33946d2228a82eeb31016ab237825cec547017095f&payTo=0xc2a3...4083'

# 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://quartermaster.surewhynot.app/v1/payment-proof?amount=0.001&hash=0x06be01596be1cb68d9b12a33946d2228a82eeb31016ab237825cec547017095f&payTo=0xc2a3...4083' \
  | 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 $0.003 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.003" });
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 $0.003 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fquartermaster.surewhynot.app%2Fv1%2Fpayment-proof
const res = await pay("https://quartermaster.surewhynot.app/v1/payment-proof?amount=0.001&hash=0x06be01596be1cb68d9b12a33946d2228a82eeb31016ab237825cec547017095f&payTo=0xc2a3...4083");
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 $0.003 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.003"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://quartermaster.surewhynot.app/v1/payment-proof?amount=0.001&hash=0x06be01596be1cb68d9b12a33946d2228a82eeb31016ab237825cec547017095f&payTo=0xc2a3...4083")
    print(res.status_code, res.text)

Security scan

No findings

We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
2 h agoPassed4021.1 s$0.003
6 h agoPassed402730 ms$0.003
11 h agoPassed402848 ms$0.003
16 h agoPassed402892 ms$0.003
20 h agoPassed402120 ms$0.003
Show 10 older checks
24 h agoPassed4021.3 s$0.003
28 h agoPassed4021.2 s$0.003
33 h agoPassed402718 ms$0.003
37 h agoPassed402787 ms$0.003
41 h agoPassed402840 ms$0.003
45 h agoPassed402817 ms$0.003
2 days agoPassed402676 ms$0.003
2 days agoPassed4021.0 s$0.003
2 days agoPassed402209 ms$0.003
3 days agoPassed402681 ms$0.003