# A2A, MCP & HTTP 402 Endpoint SLA Compliance Auditor

> A2A, MCP & HTTP 402 Endpoint SLA Compliance Auditor is a paid API for AI agents from serp-extract.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-23).

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

## Facts

- Endpoint: POST https://serp-extract.agentdiet.dev/v1/x402-mpp-paywall-verifier?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: serp-extract.agentdiet.dev
- Website: https://serp-extract.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/serp-extract-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-2dbd87fd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_APVHw3O8Kchj6DUNt8XV5

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 serp-extract-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-2dbd87fd -d '<json body>'
```

Example prompt: Can you audit https://my-agent.example.com/mcp for JSON-RPC compliance, latency SLA, and proper HTTP 402 payment header setup?

## When to prefer this

Choose this endpoint when you need to programmatically verify that a remote agent, MCP server, or x402 paywall is spec-compliant before integration, deployment, or payment routing — especially when you need simultaneous checks on JSON-RPC, latency SLA, OpenAPI schema, and HTTP 402 settlement headers in a single call rather than running separate validation tools.

## Known failure modes

- Target URL unreachable — network timeout or DNS failure
- Target returns non-JSON-RPC response — compliance check fails with protocol mismatch error
- HTTP 402 headers absent or malformed — returns failed verification status
- OpenAPI schema missing or invalid — schema audit section returns null or error detail
- Invalid URL input — returns 400 bad request with validation message

## 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://serp-extract.agentdiet.dev/v1/x402-mpp-paywall-verifier)

## Output

Returns a compliance report object covering JSON-RPC spec adherence, measured latency vs SLA thresholds, OpenAPI schema validity findings, and HTTP 402 / x402 payment header correctness for the audited 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/serp-extract-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-2dbd87fd/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from serp-extract.agentdiet.dev](https://www.zero.xyz/host/serp-extract.agentdiet.dev/llms.txt)