# PapaCasper Email Deliverability Check

> PapaCasper Email Deliverability Check is a paid API for AI agents from papacasper.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Checks email deliverability configuration for a domain by auditing DNS records like SPF, DKIM, DMARC, and MX

## Facts

- Endpoint: POST https://papacasper.com/mcp/pay/email_deliverability_check
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/papacasper-email-deliverability-check-149ddfd7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NRhJ7eFrIwY-EHuBrdgX7

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 papacasper-email-deliverability-check-149ddfd7 -d '<json body>'
```

Example prompt: Can you check the email deliverability setup for acmecorp.com — I want to know if the SPF, DKIM, and DMARC records are properly configured?

## When to prefer this

Choose this endpoint when you need a quick, pay-per-use email deliverability check without setting up a full email testing service. Ideal for agents auditing customer domains, diagnosing email delivery issues, or verifying DNS email configuration before sending campaigns. At $0.0007 per call it's cost-effective for bulk domain checks or one-off audits.

## Known failure modes

- Invalid or non-existent domain returns an error or empty results
- DNS lookup timeouts for domains with slow nameservers
- Partial results if only some records are resolvable
- Ambiguous results for domains with complex or multi-tenant email setups

## How this service works

A hosted MCP server exposing utility tools any AI agent can call over HTTP — page-to-markdown, SEO audits, robots/sitemap checks, and more.

## Output

Returns a structured object containing the results of DNS-level email deliverability checks for the given domain, including the presence and validity of SPF, DKIM, DMARC, and MX records, along with identified issues or misconfigurations that could affect email delivery.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "domain"
 ],
 "properties": {
  "domain": {
   "type": "string",
   "description": "Bare domain to check, e.g. example.com"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/papacasper-email-deliverability-check-149ddfd7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from papacasper.com](https://www.zero.xyz/host/papacasper.com/llms.txt)