# Mail Exchanger (MX) Lookup for Vendor Screening

> Mail Exchanger (MX) Lookup for Vendor Screening is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Returns the MX hosts and their delivery priorities for a given domain via DNS lookup, intended for vendor screening workflows.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/demand-domain-mx-records-vendor-screening?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mail-exchanger-mx-lookup-for-vendor-screening-42cb0ef8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wc62nJs3Haz-DsZl9gVw-

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability mail-exchanger-mx-lookup-for-vendor-screening-42cb0ef8 -d '<json body>'
```

Example prompt: Can you look up the MX records for stripe.com so I can see which mail servers handle their email delivery and what the priority order is?

## When to prefer this

Use this endpoint when you need to quickly determine the mail exchange infrastructure for a vendor or partner domain as part of a screening or due diligence workflow. It is ideal when you need raw DNS MX data (hosts + priorities) without email sending, inbox verification, or SMTP connectivity checks. Prefer this over full email validation services when DNS-only data suffices and cost efficiency matters ($0.01/call).

## Known failure modes

- Domain does not exist or has no MX records — returns empty result or DNS NXDOMAIN
- Malformed domain input — may return an error or unexpected result
- Temporary DNS resolution failure — transient error, retry recommended
- Private or internal domains not publicly resolvable — no results returned

## How this service works

Mail exchanger lookup for Vendor screening: Return the domain MX hosts and their delivery priorities. DNS data only; does not send email or verify that an inbox exists.

## Output

Returns a list of MX record entries for the queried domain, each containing the mail exchanger hostname and its numeric delivery priority (lower number = higher priority). DNS data only — does not verify inbox existence or send email.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "domain": {
   "type": "string",
   "default": "example.com",
   "description": "Public DNS domain, e.g. example.com."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mail-exchanger-mx-lookup-for-vendor-screening-42cb0ef8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from market.datapackvibe.com](https://www.zero.xyz/host/market.datapackvibe.com/llms.txt)