# FiatDock Email Validation

> FiatDock Email Validation is a paid API for AI agents from fiatdock.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-10).

Validates an email address by checking syntax, DNS (MX/A/AAAA records), disposable provider lists, role-mailbox detection, typo suggestions, and returns a risk verdict — without SMTP probing.

## Facts

- Endpoint: GET https://fiatdock.com/v1/email/check?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fiatdock-email-validation-c2923d5b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NfwlrtCDvsBjw_ZEQwKfk

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 fiatdock-email-validation-c2923d5b
```

Example prompt: Can you check whether 'john.doe@gmial.com' is a valid email address worth using — look for typos, check if the domain has MX records, and tell me if it's disposable or a role address?

## When to prefer this

Choose this endpoint when you need fast, lightweight email address validation that goes beyond syntax checks — covering DNS/MX records, disposable providers, role addresses, free-provider classification, and typo correction — without the latency or deliverability risk of an SMTP probe. Prefer it when you want a risk verdict with reasons rather than a simple boolean, and when pay-per-call pricing ($0.001 USDC) over x402 fits your agent's cost model. It is well-suited for pre-import list hygiene, signup form validation, or fraud screening where domain-level assurance is sufficient.

## Known failure modes

- 502 returned when DNS lookup fails — this call is not charged
- Malformed or missing 'email' field in request body results in a validation error
- No SMTP probe means a syntactically valid address on a valid domain may still bounce if the mailbox does not exist
- Disposable provider lists may not cover all newly created throwaway domains
- Typo suggestions are heuristic and may occasionally suggest incorrect corrections

## How this service works

Is this email address worth sending to? Syntax, domain DNS (MX, then A/AAAA), disposable/role/free-provider lists, a typo suggestion (gmial.com -> gmail.com), a normalized form and a risk verdict with reasons. No SMTP probe: it vouches for the domain, never the mailbox. An invalid address is a paid verdict; a DNS failure is 502, not charged. Pay-per-call via x402. An empty body is answered for the published example address (name@example.com); send {"email":"…"} for any other address.

## Output

Returns syntax validity, DNS check results (MX then A/AAAA fallback), whether the address is from a known disposable provider, whether it is a role mailbox (e.g. info@, admin@), a free-provider flag, a typo suggestion if the domain looks misspelled, the normalized canonical form of the email, and an overall risk verdict with enumerated reasons. Does not perform SMTP verification — domain deliverability is vouched for, individual mailbox existence is not. An invalid address counts as a paid verdict; a DNS failure returns HTTP 502 and is not charged.

## 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",
     "required": [],
     "properties": {
      "email": {
       "type": "string",
       "description": "The email address to check"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fiatdock-email-validation-c2923d5b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from fiatdock.com](https://www.zero.xyz/host/fiatdock.com/llms.txt)