# A2A, MCP & HTTP 402 Endpoint SLA Compliance Auditor

> A2A, MCP & HTTP 402 Endpoint SLA Compliance Auditor is a paid API for AI agents from preflight.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).

Audits any A2A, MCP, or x402 service URL for JSON-RPC compliance, latency SLA, OpenAPI schema validity, and HTTP 402 payment settlement headers

## Facts

- Endpoint: GET https://preflight.agentdiet.dev/paid?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: preflight.agentdiet.dev
- Website: https://preflight.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/preflight-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-27c66e6d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Hf_nStjhncVuUL_LPACiO

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 preflight-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-27c66e6d
```

Example prompt: Can you audit https://my-mcp-server.example.com/rpc and tell me whether it's JSON-RPC compliant, what its latency looks like, and whether it has proper HTTP 402 settlement headers?

## When to prefer this

Choose this endpoint when you need to programmatically audit an A2A agent, MCP server, or x402 payment endpoint for protocol compliance before integration or deployment. It is purpose-built for the intersection of JSON-RPC, OpenAPI, and HTTP 402/x402 payment header validation — use it instead of generic uptime monitors when you specifically care about agent-to-agent protocol correctness and micropayment settlement header conformance.

## Known failure modes

- Target URL is unreachable or times out — returns connectivity error
- Malformed URL input — returns validation error
- Target endpoint does not speak JSON-RPC or HTTP 402 — returns non-compliant status
- Payment failure for the $0.01 per-call fee — request not processed

## 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://preflight.agentdiet.dev/paid)

## Output

Returns a compliance report covering JSON-RPC conformance status, measured latency against SLA thresholds, OpenAPI schema validation results, and HTTP 402 settlement header presence and 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/preflight-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-27c66e6d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from preflight.agentdiet.dev](https://www.zero.xyz/host/preflight.agentdiet.dev/llms.txt)