# 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 2026-10-21).

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

## Facts

- Endpoint: GET https://serp-extract.agentdiet.dev/v1/preflight/certify?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- 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-91367112
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_99L_B6hYy7irJBDxL3Fvu

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-91367112
```

Example prompt: Can you audit https://myagent.example.com/mcp for JSON-RPC compliance, latency SLA, and HTTP 402 payment header support so I know if it meets A2A interoperability standards?

## When to prefer this

Use this endpoint when you need programmatic, machine-readable compliance verification of an A2A, MCP, or x402-capable agent URL — especially when checking JSON-RPC correctness, HTTP 402 payment header conformance, or latency SLA before integrating a remote agent into a workflow. Prefer this over manual inspection or generic HTTP health checks when you need structured audit output covering multiple protocol layers simultaneously.

## Known failure modes

- Target URL unreachable — network timeout or DNS resolution failure
- Target URL returns non-HTTP 200/402 response that cannot be parsed
- Malformed or missing URL parameter — 400 Bad Request
- Target endpoint does not expose an OpenAPI schema — partial audit only
- Rate limit or payment failure — HTTP 402 on the auditor itself

## 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/preflight/certify)

## Output

Returns a compliance report object covering JSON-RPC spec adherence, measured latency vs SLA thresholds, OpenAPI schema validity, and HTTP 402 / x402 payment settlement header presence and correctness 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"
  },
  "limit": {
   "type": "integer",
   "default": 20,
   "maximum": 100,
   "minimum": 1,
   "description": "Maximum number of items to return per page (1-100)"
  },
  "cursor": {
   "type": "string",
   "description": "Opaque pagination cursor for fetching the next page"
  }
 }
}
```

## 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-91367112/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)