ToolVet
75trust / 100

Attest

by numberintel.dev in Onchain & crypto

x402 APIPassing, checked 3 h ago

Signed settlement attestation: we make a REAL x402 purchase from your target endpoint (up to $0.1), grade the delivered response against its advertised schema, and return an EIP-191-signed attestation embedding the on-chain USDC receipt. Proof-of-real-delivery for directories, reputation systems and sellers.

POST
https://numberintel.dev/v1/attest
Price
$0.25
per call in USDC
Uptime
100%
last 30 days
Response time
585 ms
708 ms slowest 5%
Last check
Passed
3 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

POST https://numberintel.dev/v1/attest

Each call costs $0.25 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://numberintel.dev/v1/attest
content-type: application/json

{
  "max_spend_usd": 0.01,
  "method": "GET",
  "target": "https://api.onesource.io/api/chain/block-number"
}

Parameters

ParameterTypeRequiredDescription
bodyobjectNoJSON body for POST targets
max_spend_usdnumberNocap on target spend, hard max 0.1
methodstringNoGET or POST
targetstringYeshttps URL of the x402 endpoint to buy from

Example response

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

{
  "attestation": {
    "attestor": "0x3708...9234",
    "delivery": {
      "http_status": 200,
      "is_json": true,
      "paid_latency_ms": 900,
      "sha256": "..."
    },
    "grade": "delivered",
    "id": "...",
    "method": "GET",
    "purchase": {
      "quote_usd": 0.001,
      "receipt": {
        "network": "eip155:8453",
        "transaction": "0x..."
      },
      "settled": true
    },
    "target": "https://api.onesource.io/api/chain/block-number",
    "version": 1
  },
  "signature": "0x..."
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.25.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://numberintel.dev/v1/attest' \
  -H 'content-type: application/json' \
  --data-raw '{"max_spend_usd":0.01,"method":"GET","target":"https://api.onesource.io/api/chain/block-number"}'

# 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://numberintel.dev/v1/attest' \
  -H 'content-type: application/json' \
  --data-raw '{"max_spend_usd":0.01,"method":"GET","target":"https://api.onesource.io/api/chain/block-number"}' \
  | 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 $0.25 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.25" });
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 $0.25 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fnumberintel.dev%2Fv1%2Fattest&method=POST
const res = await pay("https://numberintel.dev/v1/attest", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "max_spend_usd": 0.01,
    "method": "GET",
    "target": "https://api.onesource.io/api/chain/block-number"
  }),
});
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 $0.25 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.25"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://numberintel.dev/v1/attest",
        json={
            "max_spend_usd": 0.01,
            "method": "GET",
            "target": "https://api.onesource.io/api/chain/block-number",
        },
    )
    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
3 h agoPassed402708 ms$0.25
9 h agoPassed402612 ms$0.25
14 h agoPassed402581 ms$0.25
19 h agoPassed402571 ms$0.25
24 h agoPassed402176 ms$0.25
Show 10 older checks
28 h agoPassed402585 ms$0.25
33 h agoPassed402556 ms$0.25
38 h agoPassed402584 ms$0.25
43 h agoPassed402650 ms$0.25
47 h agoPassed402729 ms$0.25
2 days agoPassed402556 ms$0.25
2 days agoPassed402629 ms$0.25
3 days agoPassed402614 ms$0.25
3 days agoPassed402578 ms$0.25
3 days agoPassed402625 ms$0.25