# Email Deliverability Check

> Email Deliverability Check is a paid API for AI agents from anibalb.duckdns.org, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).

Checks whether an email address or domain is deliverable by validating MX records, address format, and disposable/temporary email status

## Facts

- Endpoint: GET https://anibalb.duckdns.org/x402/email-deliverability?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/email-deliverability-check-6701c630
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0EbAyI66_fmnQ5LHwvJ-j

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-deliverability-check-6701c630
```

Example prompt: Can you check if the email address john.doe@example.com is actually deliverable — does it have valid MX records, is it a real address format, and is it from a disposable email provider?

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call email deliverability check with no account setup required. Ideal for agents that need to validate user-submitted emails at sign-up, screen leads before outreach, or detect throwaway addresses — especially in workflows where sporadic, low-volume checks make a subscription service impractical. Best suited for quick boolean-flag checks rather than deep SMTP handshake verification.

## Known failure modes

- Missing or malformed email/domain input may return an error or empty result
- Unknown or newly created disposable domains may not be flagged as disposable
- DNS lookup failures may cause mx field to return false even for valid domains
- Rate limits or network timeouts may result in failed payment with no response
- Private or internal domains may return false negatives for MX checks

## How this service works

Public data and utility APIs paid per call in USDC on Base (x402). No accounts, no API keys. 174 routes: crypto/equity data, onchain reads, DNS/email/security intel, geo/weather, x402 payment diagnostics, dev utilities and more.

## Output

Returns a JSON object with three boolean fields: 'mx' indicating whether the domain has valid MX records, 'valid' indicating whether the email address format is valid, and 'disposable' indicating whether the email comes from a known disposable/temporary email provider.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "mx": true,
  "valid": true,
  "disposable": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/email-deliverability-check-6701c630/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from anibalb.duckdns.org](https://www.zero.xyz/host/anibalb.duckdns.org/llms.txt)