MX lookup API
Resolves MX records, orders them by preference, and detects null MX (RFC 7505) and MX targets that do not resolve.
GET https://api.probekit.dev/v1/mail/mx
Updated 2026-10-09
Examples use the Base (eip155:8453) network.
Input
Query parameters.
| Name | Type | Required | Limits | Description |
|---|---|---|---|---|
domain | string | Yes | 1–1024 characters | The domain to check, for example example.com. |
Example request
curl -i 'https://api.probekit.dev/v1/mail/mx?domain=example.com'import asyncio
import os
from eth_account import Account
from x402 import x402Client
from x402.http.clients import x402HttpxClient
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact import register_exact_evm_client
async def main() -> None:
signer = EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"]))
client = register_exact_evm_client(x402Client(), signer, networks="eip155:8453")
async with x402HttpxClient(client) as http:
response = await http.get('https://api.probekit.dev/v1/mail/mx', params={'domain': 'example.com'})
response.raise_for_status()
print(response.json())
asyncio.run(main())
import { wrapFetchWithPaymentFromConfig } from "@x402/fetch";
import { ExactEvmScheme } from "@x402/evm";
import { privateKeyToAccount } from "viem/accounts";
const account = privateKeyToAccount(process.env.EVM_PRIVATE_KEY);
const fetchWithPayment = wrapFetchWithPaymentFromConfig(fetch, {
schemes: [{ network: "eip155:8453", client: new ExactEvmScheme(account) }],
});
const response = await fetchWithPayment("https://api.probekit.dev/v1/mail/mx?domain=example.com");
console.log(await response.json());
curl: unpaid request — returns 402 with the price (PAYMENT-REQUIRED). The Python and JavaScript clients pay it and send the request again. Only ordinary wallets (EOA) can pay; smart-contract wallets get a 402 without charge. See payments.
Example response
{
"checked_at": "2026-10-24T12:00:00Z",
"data": {
"domain": "example.com",
"hosts": [
{
"addresses": [
"192.0.2.25"
],
"exchange": "mx1.example.com",
"preference": 10,
"resolved": true
},
{
"addresses": [
"192.0.2.26"
],
"exchange": "mx2.example.com",
"preference": 20,
"resolved": true
}
],
"implicit_mx": false,
"null_mx": false
},
"endpoint": "mail.mx",
"findings": [],
"meta": {
"cache_hit": false,
"duration_ms": 42,
"fresh_until": "2026-10-24T12:05:00Z",
"observed_at": "2026-10-24T12:00:00Z",
"resolver": "example",
"source": "dns"
},
"request_id": "req_aaaaaaaaaaaaaaaaaaaaaaaaaa",
"schema_version": "1.0",
"status": "ok"
}
Response fields
| Field | Meaning |
|---|---|
request_id | Unique id of this request. Quote it when you contact support. |
endpoint | The endpoint id, for example mail.spf. |
schema_version | Version of the response format, currently 1.0. |
checked_at | When the check ran (ISO 8601, UTC). |
status | ok, info, warning or error from the worst finding, or unknown when the check was incomplete. unknown is not an error in the domain. |
data | The check's own data. Its fields are listed below. |
findings | What was found: code, severity, message, explanation and evidence. |
meta | Duration, cache use, resolver and how long the result stays fresh. |
Fields in data
| Field | Type |
|---|---|
domain | string |
null_mx | boolean |
implicit_mx | boolean |
hosts | array of MxHost |
Status codes
| Status | Code | Meaning | Do you pay? |
|---|---|---|---|
| 200 | — | The result is delivered, also when it has negative findings. | Yes: charged once per payment; redelivery of the same payment is free |
| 402 | — | Payment is required, or the attached payment was refused. The body states the price. | No |
| 400 | bad_request | The request is malformed. | No |
| 409 | payment_in_progress, payment_bound_to_other_request | This payment is already being processed, or it is bound to a different request. No new payment is taken. | No |
| 422 | invalid_input | The input failed validation on a request that carries a payment; nothing is charged. Without a payment, invalid input gets a 402 whose error field names the problem. | No |
| 429 | rate_limited | Too many requests from this IP address or payer. | No |
| 502 | check_failed | The check could not be completed. | No |
| 503 | busy, unavailable, payments_unavailable | The service is busy or temporarily unavailable. | No |
| 504 | deadline_exceeded | The check ran out of time. | No |
Errors use the common error body. See errors.
Findings this endpoint can return
MX (5)
- Warning
MX_NOT_FOUNDThe domain has no MX records. - Info
MX_NULLThe domain publishes a null MX and does not accept mail. - Error
MX_NULL_WITH_OTHERSA null MX is published together with other MX records. - Error
MX_TARGET_IS_IPAn MX record points to an IP address instead of a host name. - Error
MX_TARGET_UNRESOLVABLEAn MX host has no A or AAAA records.
Check (1)
- Warning
CHECK_QUERY_BUDGET_EXCEEDEDThe check stopped after reaching its DNS query limit.
DNS (3)
- Error
DNS_DOMAIN_NOT_FOUNDThe DNS resolver reported that the domain does not exist. - Warning
DNS_RESOLVER_FAILUREThe DNS resolver returned a server failure. - Warning
DNS_RESOLVER_TIMEOUTThe DNS resolver did not answer in time.