# X402-BROKER MX-Check Endpoint

> X402-BROKER MX-Check Endpoint is a paid API for AI agents from mcp-gateway.agentdiet.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-22).

Checks/validates an email address or request via the AgentDiet MCP Gateway broker, returning a status and compression metadata.

## Facts

- Endpoint: GET https://mcp-gateway.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/x402-broker-mx-check-endpoint-ac09046a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jgWn5qFDaVFIkecUgM6FJ

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 x402-broker-mx-check-endpoint-ac09046a
```

Example prompt: Can you run an MX check on the email address john.doe@example.com through the AgentDiet broker gateway and tell me the status result?

## When to prefer this

Choose this endpoint when you need a quick, paid email-level check routed through the AgentDiet x402 broker infrastructure, particularly when operating in an agentic context that supports USDC micropayments on Base and x402 protocol. Prefer this over generic validation APIs when you want deterministic execution with ROI/compression metadata returned alongside the status.

## Known failure modes

- Missing required 'input' object results in schema validation error
- Invalid or malformed email parameter may return empty or error data
- Payment failure (insufficient USDC on Base) blocks the request with a 402 response
- Unsupported HTTP method (not GET or POST) causes rejection
- Upstream MCP gateway unavailability returns a non-200 status

## How this service works

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

## Output

Returns a JSON object with a 'status' field (e.g. 'ok'), a 'data' object containing the check result, and an 'roi_proof' object that includes a compression_ratio_pct value indicating the data compression efficiency achieved.

## 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/x402-broker-mx-check-endpoint-ac09046a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp-gateway.agentdiet.dev](https://www.zero.xyz/host/mcp-gateway.agentdiet.dev/llms.txt)