# Polyform Email Domain Check

> Polyform Email Domain Check is a paid API for AI agents from api.polyform.org, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Checks whether an email domain can receive mail by looking up its MX records, SPF record, and DMARC policy

## Facts

- Endpoint: GET https://api.polyform.org/v1/email/domain-check
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/polyform-email-domain-check-59fd1659
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9MIdneIXgnut7a7UTLnyu

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 polyform-email-domain-check-59fd1659
```

Example prompt: Can you check whether the domain acme.com is set up to receive email — I want to know its MX records, whether it has SPF and DMARC configured, and if it can actually receive messages?

## When to prefer this

Choose this endpoint when you need a quick, no-account pay-per-call DNS/email validation check for a single domain — especially in agent workflows that need to verify email deliverability, enrich contact data, or screen domains before sending. Prefer this over full email verification APIs when you only need domain-level checks (not mailbox-level existence) and want to avoid API key setup overhead.

## Known failure modes

- Domain does not exist or has no DNS records — may return canReceive: false with empty MX array
- Transient DNS lookup failure — may return an error or partial result
- Malformed domain input — likely returns a 4xx error
- DMARC record absent — dmarc field may be null or 'none'
- SPF record missing — spf field returns false

## How this service works

Pay-per-call data endpoints for AI agents. USDC on Base via x402. No account, no API key — one micropayment per call.

## Output

Returns a JSON object with: the domain name, an array of MX record hostnames, a boolean SPF field indicating whether SPF is configured, a DMARC field with the DMARC policy string (e.g. 'reject', 'quarantine', 'none'), and a canReceive boolean indicating whether the domain is configured to receive email.

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "mx": [
   "gmail-smtp-in.l.google.com"
  ],
  "spf": true,
  "dmarc": "reject",
  "domain": "gmail.com",
  "canReceive": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/polyform-email-domain-check-59fd1659/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.polyform.org](https://www.zero.xyz/host/api.polyform.org/llms.txt)