# A2A, MCP & HTTP 402 Endpoint SLA Compliance Auditor

> A2A, MCP & HTTP 402 Endpoint SLA Compliance Auditor is a paid API for AI agents from shopify-spy.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 presence, and HTTP 402 payment settlement headers

## Facts

- Endpoint: GET https://shopify-spy.agentdiet.dev/v1/paywall-check?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: shopify-spy.agentdiet.dev
- Website: https://shopify-spy.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/shopify-spy-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-a87dbf1b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6WZEOkjXH_349HMAT_-Aa

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 shopify-spy-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-a87dbf1b
```

Example prompt: Can you audit https://myagent.example.com/rpc and tell me if it's JSON-RPC compliant, whether its latency meets SLA, and whether it has proper HTTP 402 payment headers?

## When to prefer this

Use this endpoint when you need to programmatically verify that an A2A, MCP, or x402-enabled service URL is protocol-compliant and production-ready — especially before integrating a third-party agent service, debugging payment header issues, or running SLA spot-checks on deployed agent infrastructure. It is purpose-built for agent protocol compliance auditing, not generic HTTP health checks or uptime monitoring.

## Known failure modes

- Target URL is unreachable or times out — returns connectivity error
- Target URL returns non-JSON or malformed response — compliance check fails
- Missing or malformed HTTP 402 headers — flagged as non-compliant
- Target URL has no OpenAPI schema — schema check returns absent
- URL parameter not provided — returns validation error

## 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://shopify-spy.agentdiet.dev/v1/paywall-check)

## Output

Returns a structured audit report covering: JSON-RPC protocol compliance status, measured latency against SLA thresholds, presence and validity of OpenAPI schema, and correctness of HTTP 402 settlement headers — giving a pass/fail view of the target endpoint's readiness

## 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/shopify-spy-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-a87dbf1b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from shopify-spy.agentdiet.dev](https://www.zero.xyz/host/shopify-spy.agentdiet.dev/llms.txt)