# A2A, MCP & HTTP 402 Endpoint SLA Compliance Auditor

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

Audits a remote agent, MCP, or x402 URL for JSON-RPC compliance, latency SLA adherence, OpenAPI schema validity, and HTTP 402 payment settlement headers

## Facts

- Endpoint: GET https://preflight.agentdiet.dev/v1/mpp-verifier?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: preflight.agentdiet.dev
- Website: https://preflight.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/preflight-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-d5f498d3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tOSEexrqtvEeCgycwKX6N

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 preflight-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-d5f498d3
```

Example prompt: Run a full compliance audit on https://myagent.example.com/mcp — check it for JSON-RPC correctness, latency SLA, OpenAPI schema validity, and whether its HTTP 402 payment headers are properly configured.

## When to prefer this

Choose this endpoint when you need a structured, multi-dimensional compliance check specifically covering JSON-RPC correctness, latency SLA, OpenAPI schema, and HTTP 402 payment headers on an A2A, MCP, or x402 service — particularly during pre-deployment validation, third-party agent vetting, or ongoing protocol conformance monitoring. Prefer this over generic uptime monitors or ping tools when protocol-level compliance details matter.

## Known failure modes

- Target URL is unreachable or times out — audit fails with a connectivity error
- URL points to a non-agent or non-MCP service — compliance checks return not-applicable or fail
- Malformed or missing URL parameter — returns 400 bad request
- Target service blocks external probes — partial or empty audit results
- x402 headers absent on a non-payment endpoint — 402 check returns not-configured

## 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://preflight.agentdiet.dev/v1/mpp-verifier)

## Output

Returns a structured compliance report covering JSON-RPC protocol adherence, measured latency vs. SLA thresholds, OpenAPI schema validity findings, and the status of HTTP 402 / x402 settlement headers for the audited endpoint URL.

## 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/preflight-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-d5f498d3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from preflight.agentdiet.dev](https://www.zero.xyz/host/preflight.agentdiet.dev/llms.txt)