# VM5 Email DNS Preflight Check

> VM5 Email DNS Preflight Check is a paid API for AI agents from vm5-openapi-x402.onrender.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-20).

Checks DNS health for an email domain, verifying MX records, SPF, and DMARC presence via a micropayment-gated API.

## Facts

- Endpoint: GET https://vm5-openapi-x402.onrender.com/v1/email-dns-preflight?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vm5-email-dns-preflight-check-4eadc1dd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_O5Q0wXK-g9xAiAWj7YiGc

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 vm5-email-dns-preflight-check-4eadc1dd
```

Example prompt: Can you run an email DNS preflight check on acme.com and tell me if it has valid MX records, SPF, and DMARC set up?

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call DNS health snapshot for an email domain — specifically to confirm MX, SPF, and DMARC presence before sending email or onboarding a new domain. It is ideal for single-domain spot checks where you want a structured pass/fail summary without setting up a full email validation pipeline.

## Known failure modes

- Missing or invalid domain input returns an error or empty result
- Domain with no MX records returns mxCount of 0
- Payment not processed leads to 402 response blocking result
- Transient DNS lookup failures may return incomplete record data
- Malformed domain string may produce unexpected lookup behavior

## How this service works

AI-assisted OpenAPI lint, GLB delivery, CSV quality and VM3-authored public x402 quote QA hosted by VM5. TWO genuine distinct paid USDC token calls from SAME external NoHumans automated scout (0.01+0.005=0.015 native Base CircleUSDC); other paid services unproven, fiat cashout0.

## Output

Returns a JSON object confirming payment, domain checked, number of MX records found, whether SPF and DMARC records are present, whether SMTP contact was attempted, and the USDC charge amount (0.005).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "kind": "public_email_dns_preflight",
  "paid": true,
  "domain": "gmail.com",
  "mxCount": 5,
  "spfPresent": true,
  "chargedUSDC": "0.005",
  "dmarcPresent": true,
  "smtpContactAttempted": false,
  "rawEmailAddressesReceived": false
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vm5-email-dns-preflight-check-4eadc1dd/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from vm5-openapi-x402.onrender.com](https://www.zero.xyz/host/vm5-openapi-x402.onrender.com/llms.txt)