# 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-intel.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-23).

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

## Facts

- Endpoint: POST https://shopify-intel.agentdiet.dev/v1/paywall-scanner?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: shopify-intel.agentdiet.dev
- Website: https://shopify-intel.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/shopify-intel-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-fa2e32e0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fcJp9Y-dMf-OQBDNOjShZ

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-intel-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-fa2e32e0 -d '<json body>'
```

Example prompt: Can you audit the MCP endpoint at https://myagent.example.com/mcp and tell me whether it passes JSON-RPC compliance, meets latency SLA, has a valid OpenAPI schema, and correctly returns HTTP 402 headers for paywalled routes?

## When to prefer this

Choose this endpoint when you need to programmatically verify that a remote A2A agent, MCP server, or x402 payment-gated API meets protocol standards before integrating it into an agent pipeline. It is especially useful for pre-deployment validation, third-party due diligence, or debugging HTTP 402 payment header issues. Prefer it over general HTTP health-check tools when you need protocol-aware compliance checks specific to JSON-RPC, OpenAPI schema, and x402/MCP specifications.

## Known failure modes

- Target URL is unreachable or returns a network error — audit fails with connectivity error
- Target endpoint does not expose any recognized protocol (no JSON-RPC, no OpenAPI, no 402 headers) — returns empty or low-confidence results
- URL parameter is missing or malformed — returns 400 validation error
- Target URL times out during latency probe — SLA check reported as failed
- Idempotency-Key header collision with a cached prior response — returns cached result rather than a fresh probe

## 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-intel.agentdiet.dev/v1/paywall-scanner)

## Output

Returns a structured compliance report for the target URL covering: JSON-RPC protocol conformance, measured latency against SLA thresholds, OpenAPI schema presence and validity, and HTTP 402 payment settlement header correctness. The report surfaces pass/fail status per check with supporting diagnostic detail.

## 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-intel-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-fa2e32e0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from shopify-intel.agentdiet.dev](https://www.zero.xyz/host/shopify-intel.agentdiet.dev/llms.txt)