ToolVet
80trust / 100

Zap Receipt Check

by nostr.halowerk.com in Markets & finance

x402 APIPassing, checked 2 h ago

Takes a kind 9735 receipt directly or fetches it from relays by event id, then runs eight named checks and reports each one separately with its reason. The receipt signature and the signature of the zap request enclosed in the description tag are verified per BIP-340. The invoice is decoded and its amount is compared against the amount tag of the zap request, since those two can disagree and only the invoice was payable.

POST https://nostr.halowerk.com/zap-receipt-check

Last 30 days

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed

Uptime
100%
Response time
138 ms typical, 203 ms slowest 5%
Last check
2 h ago
Next check
any minute now

How to call it

POST https://nostr.halowerk.com/zap-receipt-check

Each call costs $0.002 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.

POST https://nostr.halowerk.com/zap-receipt-check
content-type: application/json

{
  "event_id": "beispiel",
  "receipt": {}
}

Parameters

ParameterTypeRequiredDescription
event_idstringNoEvent id of the receipt as hex, note or nevent. Fetched from the relays when receipt is not given.
receiptobjectNoThe complete kind 9735 event. Either this or event_id is required.
recipient_lightning_addressstringNoLightning address of the recipient, for example name@domain. Given, the issuer is compared against the nostrPubkey published there.
relaysarray of stringNowss relay addresses used when fetching by event_id.

Example response

The listing has no example response.

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.002.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://nostr.halowerk.com/zap-receipt-check' \
  -H 'content-type: application/json' \
  --data-raw '{"event_id":"beispiel","receipt":{}}'

# 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 - -X POST 'https://nostr.halowerk.com/zap-receipt-check' \
  -H 'content-type: application/json' \
  --data-raw '{"event_id":"beispiel","receipt":{}}' \
  | 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 $0.002 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.002" });
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 $0.002 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fnostr.halowerk.com%2Fzap-receipt-check&method=POST
const res = await pay("https://nostr.halowerk.com/zap-receipt-check", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "event_id": "beispiel",
    "receipt": {}
  }),
});
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 $0.002 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.002"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://nostr.halowerk.com/zap-receipt-check",
        json={
            "event_id": "beispiel",
            "receipt": {},
        },
    )
    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 agoPassed402108 ms$0.002
6 h agoPassed402195 ms$0.002
10 h agoPassed402139 ms$0.002
13 h agoPassed402138 ms$0.002
17 h agoPassed402187 ms$0.002
21 h agoPassed402131 ms$0.002
25 h agoPassed402160 ms$0.002
28 h agoPassed402134 ms$0.002
32 h agoPassed402153 ms$0.002
36 h agoPassed402131 ms$0.002
39 h agoPassed402141 ms$0.002
43 h agoPassed402138 ms$0.002
46 h agoPassed402188 ms$0.002
2 days agoPassed402131 ms$0.002
2 days agoPassed402120 ms$0.002