# FiatDock Email Deliverability Check

> FiatDock Email Deliverability Check is a paid API for AI agents from fiatdock.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-23).

Checks whether an email address is likely to be deliverable by performing deep deliverability analysis beyond basic syntax and MX validation

## Facts

- Endpoint: GET https://fiatdock.com/s/svc_e645b63c-c5c0-42fc-9ca6-bac9ca652304?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fiatdock-email-deliverability-check-c83beca1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vvacaepijKCKsYHkmlxD4

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-deliverability-check-c83beca1
```

Example prompt: Can you check whether john.doe@example.com is actually deliverable — like, will it bounce if I try to send to it?

## When to prefer this

Choose this endpoint over the sibling 'Email syntax + MX check' when you need a deeper deliverability signal beyond mere syntax validity and MX record existence — e.g. when you want to know if the specific mailbox accepts mail, assess bounce risk before a send, or clean a contact list. Use the cheaper syntax+MX check for high-volume first-pass filtering, and this endpoint for higher-confidence verification on shortlisted addresses.

## Known failure modes

- Missing or invalid email address argument returns an argument error (call still billed)
- Unknown or unresolvable domain may return indeterminate result
- Catch-all mail servers may prevent definitive inbox-level verification
- Rate limits or timeouts on the target mail server may cause inconclusive results
- Malformed MCP request body returns protocol-level error

## How this service works

Pay-per-call: Email Deliverability

## Output

Returns a deliverability assessment for the provided email address, likely including a deliverability status, risk level, or score indicating whether the address is likely to accept mail, along with signals such as whether the mailbox exists, is a catch-all, or is a known disposable/role address.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string"
      }
     }
    }
   },
   "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-deliverability-check-c83beca1/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)