# 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 a remote A2A agent, MCP server, or x402 URL for JSON-RPC compliance, latency SLA adherence, OpenAPI schema validity, and HTTP 402 payment settlement headers

## Facts

- Endpoint: GET https://shopify-spy.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: 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-3537b896
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3ayMEVwvNoKHDBnZtpxa-

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-3537b896
```

Example prompt: Can you run a compliance audit on https://myagent.example.com/mcp and tell me whether it passes JSON-RPC spec, meets latency SLA, has a valid OpenAPI schema, and supports HTTP 402 payment headers?

## When to prefer this

Use this endpoint when you need to verify that a specific A2A agent, MCP server, or x402-capable URL is protocol-compliant before integrating it into an agent workflow, listing it in a marketplace, or routing live traffic to it. Prefer it over manual inspection or generic HTTP checkers when you specifically need JSON-RPC, OpenAPI, HTTP 402, and latency SLA checks in one call.

## Known failure modes

- Target URL is unreachable or times out — audit fails with connectivity error
- Invalid or malformed URL provided — returns validation error
- Target endpoint returns non-standard or empty responses making compliance undeterminable
- HTTP 402 headers absent or malformed — flagged as non-compliant but audit still returns
- OpenAPI schema missing at target — schema check fails with absence warning
- Rate limiting or firewall at target URL blocks probe requests

## 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/preflight/certify)

## Output

Returns a structured compliance report indicating whether the target URL passes JSON-RPC protocol compliance, latency SLA thresholds, OpenAPI schema validity, and HTTP 402 settlement header requirements, along with any specific failures or warnings detected during the audit.

## 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-3537b896/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)