ToolVet
81trust / 100

Email Check

by FiatDock in Email & messaging

x402 APIPassing, checked 2 h ago

Is this email address worth sending to? Syntax, domain DNS (MX, then A/AAAA), disposable/role/free-provider lists, a typo suggestion (gmial.com -> gmail.com), a normalized form and a risk verdict with reasons. No SMTP probe: it vouches for the domain, never the mailbox. An invalid address is a paid verdict; a DNS failure is 502, not charged. Pay-per-call via x402. An empty body is answered for the published example address ([email protected]); send {"email":"…"} for any other address.

POST https://fiatdock.com/v1/email/check

Last 30 days

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed

Uptime
100%
Response time
168 ms typical, 187 ms slowest 5%
Last check
2 h ago
Next check
any minute now

How to call it

POST https://fiatdock.com/v1/email/check

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://fiatdock.com/v1/email/check
content-type: application/json

{
  "email": "[email protected]"
}

Parameters

ParameterTypeRequiredDescription
emailstringNoThe email address to check

Example response

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

{
  "checkedAt": "2026-09-21T00:00:00.000Z",
  "deliverableDomain": true,
  "domain": "example.com",
  "domainExists": true,
  "email": "[email protected]",
  "hasA": true,
  "hasMx": false,
  "isDisposable": false,
  "isFreeProvider": false,
  "isRole": false,
  "local": "name",
  "method": "syntax + DNS (MX, then A/AAAA) + disposable/role/free-provider lists + a typo map; no SMTP probe",
  "mx": [],
  "normalized": "[email protected]",
  "reasons": [
    "no_mx_record"
  ],
  "risk": "low",
  "suggestion": null,
  "syntaxValid": true
}

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://fiatdock.com/v1/email/check' \
  -H 'content-type: application/json' \
  --data-raw '{"email":"[email protected]"}'

# 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://fiatdock.com/v1/email/check' \
  -H 'content-type: application/json' \
  --data-raw '{"email":"[email protected]"}' \
  | 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%2Ffiatdock.com%2Fv1%2Femail%2Fcheck&method=POST
const res = await pay("https://fiatdock.com/v1/email/check", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "email": "[email protected]"
  }),
});
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://fiatdock.com/v1/email/check",
        json={
            "email": "[email protected]",
        },
    )
    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 agoPassed402168 ms$0.001
6 h agoPassed402165 ms$0.001
10 h agoPassed402187 ms$0.001
14 h agoPassed40249 ms$0.001
23 h agoPassed402200 ms$0.001