ToolVet
78trust / 100

Trust Firewall

by json-repair-api-9ybv.onrender.com in Onchain & crypto

x402 APIPassing, checked 7 h ago

Automatic before-payment firewall for x402 clients. Runs after the merchant returns PAYMENT-REQUIRED but before the wallet creates/signs the merchant payment. Returns ALLOW, REVIEW or BLOCK based on exact request/challenge integrity and public merchant/payTo risk evidence. Spending authority remains with the caller's wallet/client policy unless full transaction clearance is used.

POST
https://json-repair-api-9ybv.onrender.com/trust/x402/firewall
Price
$0.001
per call in USDC
Uptime
100%
last 30 days
Response time
191 ms
449 ms slowest 5%
Last check
Passed
7 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://json-repair-api-9ybv.onrender.com/trust/x402/firewall

Each call costs $0.001 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://json-repair-api-9ybv.onrender.com/trust/x402/firewall
content-type: application/json

{
  "category": "ai-infrastructure",
  "merchant_id": "merchant.example",
  "payment_required": {
    "accepts": [
      {
        "amount": "10000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0x1111111111111111111111111111111111111111",
        "scheme": "exact"
      }
    ],
    "resource": {
      "description": "Merchant paid resource",
      "mimeType": "application/json",
      "url": "https://merchant.example/api/resource"
    },
    "x402Version": 2
  },
  "request": {
    "body": {
      "task": "example"
    },
    "method": "POST",
    "url": "https://merchant.example/api/resource"
  }
}

Parameters

ParameterTypeRequiredDescription
categorystringNoOptional purchase category for audit context.
merchant_idstringNoOptional stable merchant identifier. If omitted, the resource hostname is used.
payment_requiredobject or stringYesThe merchant's real x402 PAYMENT-REQUIRED payload, as decoded JSON or its encoded string.
requestobjectYesExact HTTP request the agent intends to make after the preflight.

Example response

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

{
  "allowed": true,
  "decision": "APPROVED",
  "firewall_action": "ALLOW",
  "merchant_risk": {
    "decision": "APPROVED",
    "reasons": [
      "no_material_public_risk_signal_observed"
    ],
    "risk_level": "LOW",
    "score": 0
  },
  "next_action": "CREATE_PAYMENT_IF_CLIENT_POLICY_ALLOWS",
  "proof_token": "signed-transaction-preflight"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.001.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://json-repair-api-9ybv.onrender.com/trust/x402/firewall' \
  -H 'content-type: application/json' \
  --data-raw '{"category":"ai-infrastructure","merchant_id":"merchant.example","payment_required":{"accepts":[{"amount":"10000","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","maxTimeoutSeconds":300,"network":"eip155:8453","payTo":"0x1111111111111111111111111111111111111111","scheme":"exact"}],"resource":{"description":"Merchant paid resource","mimeType":"application/json","url":"https://merchant.example/api/resource"},"x402Version":2},"request":{"body":{"task":"example"},"method":"POST","url":"https://merchant.example/api/resource"}}'

# 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://json-repair-api-9ybv.onrender.com/trust/x402/firewall' \
  -H 'content-type: application/json' \
  --data-raw '{"category":"ai-infrastructure","merchant_id":"merchant.example","payment_required":{"accepts":[{"amount":"10000","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","maxTimeoutSeconds":300,"network":"eip155:8453","payTo":"0x1111111111111111111111111111111111111111","scheme":"exact"}],"resource":{"description":"Merchant paid resource","mimeType":"application/json","url":"https://merchant.example/api/resource"},"x402Version":2},"request":{"body":{"task":"example"},"method":"POST","url":"https://merchant.example/api/resource"}}' \
  | 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 $0.001 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.001" });
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 $0.001 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fjson-repair-api-9ybv.onrender.com%2Ftrust%2Fx402%2Ffirewall&method=POST
const res = await pay("https://json-repair-api-9ybv.onrender.com/trust/x402/firewall", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "category": "ai-infrastructure",
    "merchant_id": "merchant.example",
    "payment_required": {
      "accepts": [
        {
          "amount": "10000",
          "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
          "maxTimeoutSeconds": 300,
          "network": "eip155:8453",
          "payTo": "0x1111111111111111111111111111111111111111",
          "scheme": "exact"
        }
      ],
      "resource": {
        "description": "Merchant paid resource",
        "mimeType": "application/json",
        "url": "https://merchant.example/api/resource"
      },
      "x402Version": 2
    },
    "request": {
      "body": {
        "task": "example"
      },
      "method": "POST",
      "url": "https://merchant.example/api/resource"
    }
  }),
});
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 $0.001 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.001"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://json-repair-api-9ybv.onrender.com/trust/x402/firewall",
        json={
            "category": "ai-infrastructure",
            "merchant_id": "merchant.example",
            "payment_required": {
                "accepts": [
                    {
                        "amount": "10000",
                        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
                        "maxTimeoutSeconds": 300,
                        "network": "eip155:8453",
                        "payTo": "0x1111111111111111111111111111111111111111",
                        "scheme": "exact",
                    },
                ],
                "resource": {
                    "description": "Merchant paid resource",
                    "mimeType": "application/json",
                    "url": "https://merchant.example/api/resource",
                },
                "x402Version": 2,
            },
            "request": {
                "body": {
                    "task": "example",
                },
                "method": "POST",
                "url": "https://merchant.example/api/resource",
            },
        },
    )
    print(res.status_code, res.text)

Security scan

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Recent checks

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7 h agoPassed402171 ms$0.001
16 h agoPassed402198 ms$0.001
26 h agoPassed402212 ms$0.001
35 h agoPassed402449 ms$0.001
44 h agoPassed402200 ms$0.001
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2 days agoPassed402409 ms$0.001
3 days agoPassed402201 ms$0.001
3 days agoPassed402487 ms$0.001
3 days agoPassed402184 ms$0.001
3 days agoPassed402164 ms$0.001
4 days agoPassed402195 ms$0.001
4 days agoPassed402199 ms$0.001
4 days agoPassed402188 ms$0.001
4 days agoPassed402184 ms$0.001
5 days agoPassed402168 ms$0.001