# AgentDiet MX Check — Email Validation & ROI Proof

> AgentDiet MX Check — Email Validation & ROI Proof is a paid API for AI agents from status.agentdiet.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-22).

Validates an email address and returns a compression/ROI proof metric showing context distillation efficiency

## Facts

- Endpoint: GET https://status.agentdiet.dev/v1/mx-check?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentdiet-mx-check-email-validation-roi-proof-73df3f7a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SLhsyRxI0dEqj-VNnYxFu

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 agentdiet-mx-check-email-validation-roi-proof-73df3f7a
```

Example prompt: Can you run an MX check on user@example.com to validate that email address and confirm it's reachable?

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call ($0.005 USDC) email MX validation that also returns a compression ROI proof metric, particularly within agent-to-agent (A2A) or bot-to-agent (B2A) workflows on the Base blockchain using x402 payment protocol. Best for agentic pipelines that need deterministic email validation with micropayment settlement.

## Known failure modes

- Missing or malformed email query parameter returns an error status
- Invalid domain with no MX records returns failed validation
- Network timeout reaching the AgentDiet status node
- Payment failure via x402/USDC settlement blocks the request
- Unsupported HTTP method returns a schema validation error

## How this service works

Deterministic B2A/A2A/MCP/x402/MPP/L402 execution and intelligence node at https://status.agentdiet.dev settling in USDC on Base.

## Output

Returns a JSON object with a 'status' field ('ok' or error), a 'data' object with validation details, and a 'roi_proof' object containing a 'compression_ratio_pct' value (e.g. 91.4) indicating context distillation efficiency for the request.

## 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",
      "POST"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "email": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {},
  "status": "ok",
  "roi_proof": {
   "compression_ratio_pct": 91.4
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentdiet-mx-check-email-validation-roi-proof-73df3f7a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from status.agentdiet.dev](https://www.zero.xyz/host/status.agentdiet.dev/llms.txt)