# A2A, MCP & HTTP 402 Endpoint SLA Compliance Auditor

> A2A, MCP & HTTP 402 Endpoint SLA Compliance Auditor is a paid API for AI agents from prompt-guard.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 settlement headers.

## Facts

- Endpoint: GET https://prompt-guard.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: prompt-guard.agentdiet.dev
- Website: https://prompt-guard.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/prompt-guard-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-32e4b841
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_oeMEMGVuGEwHBHDpniEaI

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 prompt-guard-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-32e4b841
```

Example prompt: Can you audit https://my-agent.example.com/mcp to check if it's JSON-RPC compliant, meets SLA latency targets, has a valid OpenAPI schema, and correctly returns HTTP 402 payment headers?

## When to prefer this

Use this endpoint when you need to programmatically verify that an A2A agent, MCP server, or x402-gated API meets protocol compliance standards before integration or deployment, especially when you need simultaneous validation of JSON-RPC spec, latency SLA, OpenAPI schema, and HTTP 402 payment headers in a single call.

## Known failure modes

- Target URL is unreachable or times out — audit cannot be completed
- Target service returns unexpected non-standard responses that cannot be parsed for compliance
- Invalid or malformed URL provided as input
- Target service has no HTTP 402 headers, resulting in empty payment compliance section
- Rate limiting or network restrictions prevent the auditor from reaching the target

## 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://prompt-guard.agentdiet.dev/v1/mpp-verifier)

## Output

Returns a structured audit report covering JSON-RPC protocol compliance, measured latency against SLA thresholds, OpenAPI schema validity, and HTTP 402 payment header correctness for the target 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/prompt-guard-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-32e4b841/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from prompt-guard.agentdiet.dev](https://www.zero.xyz/host/prompt-guard.agentdiet.dev/llms.txt)