# Email Domain Deliverability Validator

> Email Domain Deliverability Validator is a paid API for AI agents from api.aventtech.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).

Checks an email address for RFC syntax validity and live MX/A DNS deliverability via DNS-over-HTTPS, returning a structured verdict on whether the domain can receive mail.

## Facts

- Endpoint: GET https://api.aventtech.com/validate/email
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/email-domain-deliverability-validator-a002f851
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lzdjdrB8RdggbGDOz9LZR

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 email-domain-deliverability-validator-a002f851
```

Example prompt: Before I add jane.doe@examplecorp.com to my mailing list, can you check whether that email address has valid syntax and whether the domain actually has working MX records that can receive mail?

## When to prefer this

Choose this endpoint when you need fast, lightweight email address screening that combines syntax checking with live DNS-level deliverability signals — ideal for form validation, list hygiene, or pre-send checks. Prefer it over full SMTP-probe services when you only need domain-level assurance (not per-mailbox confirmation) and want a stateless, side-effect-free check with no risk of triggering spam filters.

## Known failure modes

- Invalid or missing email query parameter — returns 400 Bad Request
- Domain has no MX or A records — verdict returned as undeliverable
- DNS-over-HTTPS upstream timeout — may return error or unknown verdict
- Malformed email input fails syntax check immediately before DNS lookup
- Domain exists but temporarily unreachable DNS — may yield inconclusive result

## How this service works

Unified digital experiences for Mega Yachts, Executive Spaces, and Luxury Residences. Athens-based, nationwide projects.

## Output

Returns a JSON object containing: whether the email passes RFC-lite syntax validation, the list of MX (and/or A) hosts discovered for the domain via DNS-over-HTTPS, and an overall deliverability verdict (e.g. deliverable/undeliverable/unknown). Does not confirm individual mailbox existence — domain-level only.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "email"
     ],
     "properties": {
      "email": {
       "type": "string",
       "description": "Email address to check"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "mx": true,
  "domain": "example.com",
  "deliverable": true,
  "syntaxValid": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/email-domain-deliverability-validator-a002f851/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.aventtech.com](https://www.zero.xyz/host/api.aventtech.com/llms.txt)