Email Domain Verification API

x402

Email Domain Verification API is a paid API for AI agents from email.payapi.market, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-17).

Checks whether an email domain has valid MX records, is a disposable/temporary address provider, or is a free email provider, returning deliverability signals.

Price / call$0.001

Seller volume →—

Success—

StatusUnknown

How this service works

Email verification with x402 payments. $0.001 per request in USDC on Base.

Output

Returns a JSON object indicating whether the domain is valid (boolean), the domain name, whether it is a disposable/throwaway provider (boolean), a list of MX record hostnames found for the domain, and whether it is a free email provider (string or null).

Example use cases

Block fake signups at registration

“Before I approve this new user signup, check if the domain 'mailinator.com' is a disposable email provider or has valid MX records — I want to block throwaway addresses.”

Validate B2B lead email domains

“I have a sales lead who gave me their email at 'prospectcorp.io' — can you verify that domain has real MX records and isn't a disposable or free provider?”

Pre-send deliverability check

“Before we send our email campaign to contacts at 'startupco.com', check whether that domain has valid MX records so we don't get bounces.”

Technical details

Endpoint

POSThttps://email.payapi.market/domain-check?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need a lightweight, per-domain check for email deliverability signals — specifically MX record existence, disposable provider detection, and free provider flagging — without needing to validate a specific email address syntax or perform a full SMTP handshake. Ideal for registration flows, lead qualification, or pre-send list hygiene where cost-per-check matters and you only have the domain portion of an email address.

Side effects

Domain does not exist or has no MX records — returns valid: false with empty mx_records array
Invalid domain format submitted — may return an error or valid: false
Network timeout reaching DNS servers — request may fail with a server error
Rate limiting or payment failure — 402 payment required or 429 too many requests

Input

Schema · Request body

Field	Type	Description
domain	string	Domain to check for valid MX records and disposable status, e.g. 'acme.com'.

Output

Schema · Response

{
  "type": "json",
  "example": {
    "valid": true,
    "domain": "acme.com",
    "disposable": false,
    "mx_records": [
      "aspmx.l.google.com",
      "alt1.aspmx.l.google.com"
    ],
    "free_provider": null
  }
}

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How this service works

Email verification with x402 payments. $0.001 per request in USDC on Base.

Output

Example use cases

Block fake signups at registration

“Before I approve this new user signup, check if the domain 'mailinator.com' is a disposable email provider or has valid MX records — I want to block throwaway addresses.”

Validate B2B lead email domains

“I have a sales lead who gave me their email at 'prospectcorp.io' — can you verify that domain has real MX records and isn't a disposable or free provider?”

Pre-send deliverability check

“Before we send our email campaign to contacts at 'startupco.com', check whether that domain has valid MX records so we don't get bounces.”

Technical details

Endpoint

POSThttps://email.payapi.market/domain-check?utm_source=zero.xyz

When to prefer

Side effects

Domain does not exist or has no MX records — returns valid: false with empty mx_records array
Invalid domain format submitted — may return an error or valid: false
Network timeout reaching DNS servers — request may fail with a server error
Rate limiting or payment failure — 402 payment required or 429 too many requests

Input

Schema · Request body

Field	Type	Description
domain	string	Domain to check for valid MX records and disposable status, e.g. 'acme.com'.

Output

Schema · Response

{
  "type": "json",
  "example": {
    "valid": true,
    "domain": "acme.com",
    "disposable": false,
    "mx_records": [
      "aspmx.l.google.com",
      "alt1.aspmx.l.google.com"
    ],
    "free_provider": null
  }
}