# 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/paywall-scanner?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-5cf235ac
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3WLsnMLewhI3q-B3Px6kd

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-5cf235ac
```

Example prompt: Can you audit https://my-agent.example.com/mcp for JSON-RPC compliance, latency SLA, OpenAPI schema validity, and HTTP 402 payment headers?

## When to prefer this

Choose this endpoint when you need to programmatically verify that a remote A2A, MCP, or x402 agent service meets protocol standards — specifically JSON-RPC compliance, HTTP 402 payment header correctness, latency SLA, and OpenAPI schema validity — before integrating it into an agent workflow or swarm. Prefer it over generic HTTP health-checkers when you need protocol-aware auditing specific to AI agent and payment settlement standards.

## Known failure modes

- Target URL is unreachable or times out — returns connectivity error
- Target URL returns unexpected non-agent response format — may report inconclusive compliance
- Invalid or malformed URL input — returns validation error
- Target endpoint blocks external probes — partial results or access denied
- x402 headers absent or malformed — reported as non-compliant rather than erroring out

## 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/paywall-scanner)

## Output

Returns a structured compliance report covering JSON-RPC protocol conformance, measured latency vs SLA thresholds, OpenAPI schema validation findings, and HTTP 402 / x402 payment settlement header analysis for the submitted 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-5cf235ac/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)