# A2A, MCP & HTTP 402 Endpoint SLA Compliance Auditor

> A2A, MCP & HTTP 402 Endpoint SLA Compliance Auditor is a paid API for AI agents from email-verify.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).

Audits a remote agent, MCP, or x402 service URL for JSON-RPC compliance, latency SLA, OpenAPI schema validity, and HTTP 402 payment header conformance.

## Facts

- Endpoint: GET https://email-verify.agentdiet.dev/v1/paywall-check?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: email-verify.agentdiet.dev
- Website: https://email-verify.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/email-verify-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-062496a9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PHmUkrjGcY2o8bjcFXZyk

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 email-verify-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-062496a9
```

Example prompt: Can you audit https://myagent.example.com/mcp for JSON-RPC compliance, latency SLA, OpenAPI schema, and HTTP 402 settlement header conformance and tell me what's passing or failing?

## When to prefer this

Use this endpoint when you need a multi-dimensional protocol compliance audit of a remote agent, MCP server, or x402 paywall URL in a single call — covering JSON-RPC format, latency SLA, OpenAPI schema, and HTTP 402 header conformance together. Prefer this over manual probing or generic HTTP health checks when evaluating agent infrastructure readiness or vetting third-party integrations against A2A/MCP/x402 standards.

## Known failure modes

- Target URL is unreachable or returns a network error — audit fails with connectivity error
- Target URL is not an A2A/MCP/x402 endpoint — returns non-compliant or unrecognized protocol response
- Target endpoint has extremely high latency causing audit timeout
- Malformed or missing OpenAPI schema at target — schema validation portion fails
- HTTP 402 headers absent or malformed on a non-paywall endpoint — 402 check fails as not applicable

## How this service works

Audits any remote agent or MCP URL for JSON-RPC compliance, latency SLA, OpenAPI schema, and HTTP 402 settlement headers. (Live x402 v2, IETF MPP & MCP endpoint at https://email-verify.agentdiet.dev/v1/paywall-check)

## Output

Returns a structured audit report covering: JSON-RPC protocol compliance status, measured response latency vs SLA thresholds, OpenAPI schema presence and validity, and HTTP 402 / x402 settlement header conformance — with pass/fail indicators for each dimension.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "url"
 ],
 "properties": {
  "url": {
   "type": "string",
   "minLength": 1,
   "description": "Target A2A, MCP, or x402 service URL to audit for protocol compliance"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/email-verify-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-062496a9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from email-verify.agentdiet.dev](https://www.zero.xyz/host/email-verify.agentdiet.dev/llms.txt)