# chainverdict.xyz Email Authentication Posture Check

> chainverdict.xyz Email Authentication Posture Check is a paid API for AI agents from chainverdict.xyz, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Checks a domain's email authentication configuration by querying live DNS for SPF record and policy, DMARC policy and alignment, and DKIM selector presence.

## Facts

- Endpoint: GET https://chainverdict.xyz/v1/security/email/:domain
- 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/chainverdict-xyz-email-authentication-posture-check-c90849ed
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6Ka0m71LIR_xSwc0SHL4w

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 chainverdict-xyz-email-authentication-posture-check-c90849ed
```

Example prompt: Before I respond to this invoice from payments@acme-corp.com, can you check whether acme-corp.com has proper SPF, DMARC, and DKIM email authentication set up so I know the email is likely legitimate?

## When to prefer this

Choose this endpoint when you need a fast, live DNS check of a domain's email authentication configuration before trusting an inbound email, processing a payment, or entering a business relationship. It is purpose-built for trust judgments on counterparty email domains and combines SPF, DMARC, and DKIM in a single call — avoiding the need to query multiple DNS resolvers manually. Prefer it over generic DNS lookup tools when you specifically need an interpreted email-security posture assessment rather than raw DNS records.

## Known failure modes

- Domain does not exist or has no DNS records — returns empty or null fields for SPF/DMARC/DKIM
- Domain has no SPF or DMARC configured — records return as absent/none rather than an error
- DKIM selector lookup may be incomplete if non-standard selectors are used
- DNS propagation delays may cause stale results for recently changed records
- Payment not completed — HTTP 402 returned, call not processed
- Invalid domain format in path parameter — returns 4xx error

## How this service works

Email-authentication posture for a domain: SPF record and policy, DMARC policy and alignment, DKIM selector presence. Use it to judge whether mail claiming to be from a counterparty can be trusted. Live DNS.

## Output

Returns structured data about the target domain's email authentication posture, including: SPF record content and effective policy (e.g. -all, ~all, none), DMARC policy setting and alignment mode (strict/relaxed), and whether DKIM selectors are present in DNS. Enables a trust judgment on whether mail claiming to originate from that domain is likely authentic.

## 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"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string",
       "description": "Domain to check SPF/DMARC/DKIM"
      }
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "additionalProperties": true
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/chainverdict-xyz-email-authentication-posture-check-c90849ed/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from chainverdict.xyz](https://www.zero.xyz/host/chainverdict.xyz/llms.txt)