# 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 2026-10-11).

Checks the deliverability of an email address by analyzing syntax, DNS/MX records, and inbox-level signals

## Facts

- Endpoint: GET https://fiatdock.com/s/svc_2b5f41de-170a-4a11-a45c-2bd46e445d18?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fiatdock-email-deliverability-check-d1a0a173
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_av7OLGymk4LKuTCfTm12K

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-d1a0a173
```

Example prompt: Can you check whether the email address john.doe@example.com is actually deliverable — like does the domain have valid MX records and will the inbox accept messages?

## When to prefer this

Use this endpoint when you need a deeper deliverability signal beyond basic syntax checking — it goes beyond format validation to probe DNS/MX infrastructure and inbox-level signals. Prefer it over the sibling 'Email syntax + MX check' endpoint when you need a fuller deliverability score including risk classification. Best for pre-send validation, lead qualification, or signup fraud detection at $0.01 per check.

## Known failure modes

- Missing or malformed email address argument returns argument error (call is still billed)
- Domain has no MX records — reported as undeliverable
- Catch-all domains may show as deliverable even if specific inbox does not exist
- Temporary DNS lookup failures may cause inconclusive results
- Rate limits or timeouts on MX probing may reduce accuracy

## How this service works

Pay-per-call: Email Deliverability

## Output

Returns deliverability assessment for the given email address, including syntax validity, MX record presence, domain mail configuration, inbox-level reachability signals, and any risk flags such as disposable or catch-all domains.

## 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-d1a0a173/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)