ToolVet
75trust / 100

Seller Attest

by Agoranome in Search & web

x402 APIPassing, checked 3 h ago

Trust proof for an x402 seller: a signed attestation of your API's sample output, so buyer agents can check it before paying. Agoranome fetches a free sample from your endpoint's host, checks that your paid route on the same host answers with an x402 offer, and signs an attestation of what it saw and when: the sample's SHA-256 and body, and the offer's price, network and pay-to. Buyers check it at a public URL.

GET
https://api.agoranome.com/v1/seller/attest
Price
$0.05
per call in USDC
Uptime
100%
last 30 days
Response time
632 ms
684 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

GET https://api.agoranome.com/v1/seller/attest

Each call costs $0.05 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://api.agoranome.com/v1/seller/attest?resource=https%3A%2F%2Fapi.example.com%2Fv1%2Fpdf&sample=https%3A%2F%2Fapi.example.com%2Fv1%2Fpdf%2Fsample

Parameters

ParameterTypeRequiredDescription
resourcestringYesYour paid x402 endpoint, on the same host as the sample
samplestringYesPublic https URL that returns a sample output without payment

Example response

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

{
  "result": {
    "attestation": {
      "offer": {
        "accepts": [
          {
            "pay_to": "0x...",
            "price_usd": 0.02
          }
        ]
      },
      "provenance": {
        "agent_address": "0x...",
        "signature": "..."
      },
      "sample": {
        "bytes": 1832,
        "sha256": "...",
        "status": 200
      }
    },
    "attestation_id": "att_...",
    "url": "https://api.agoranome.com/v1/attestations/att_..."
  }
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.05.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.agoranome.com/v1/seller/attest?resource=https%3A%2F%2Fapi.example.com%2Fv1%2Fpdf&sample=https%3A%2F%2Fapi.example.com%2Fv1%2Fpdf%2Fsample'

# 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://api.agoranome.com/v1/seller/attest?resource=https%3A%2F%2Fapi.example.com%2Fv1%2Fpdf&sample=https%3A%2F%2Fapi.example.com%2Fv1%2Fpdf%2Fsample' \
  | 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 $0.05 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.05" });
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 $0.05 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.agoranome.com%2Fv1%2Fseller%2Fattest
const res = await pay("https://api.agoranome.com/v1/seller/attest?resource=https%3A%2F%2Fapi.example.com%2Fv1%2Fpdf&sample=https%3A%2F%2Fapi.example.com%2Fv1%2Fpdf%2Fsample");
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 $0.05 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.05"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://api.agoranome.com/v1/seller/attest?resource=https%3A%2F%2Fapi.example.com%2Fv1%2Fpdf&sample=https%3A%2F%2Fapi.example.com%2Fv1%2Fpdf%2Fsample")
    print(res.status_code, res.text)

Security scan

No findings

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Recent checks

WhenResultHTTPTimePrice
3 h agoPassed402642 ms$0.05
9 h agoPassed402602 ms$0.05
14 h agoPassed402222 ms$0.05
19 h agoPassed402648 ms$0.05
25 h agoPassed402632 ms$0.05
Show 1 older checks
30 h agoPassed402684 ms$0.05