# 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 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://preflight.agentdiet.dev/v1/402-compliance?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-58176984
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VryoL62TClfVLP1x87tBq

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-58176984
```

Example prompt: Can you audit https://myagent.example.com/mcp for JSON-RPC compliance, latency SLA, and HTTP 402 payment header support and tell me if anything is misconfigured?

## When to prefer this

Choose this endpoint when you need to verify that a remote A2A agent, MCP server, or x402-enabled API is properly configured for agent interoperability — specifically checking JSON-RPC correctness, latency SLA, OpenAPI schema presence, and HTTP 402 payment header compliance. It is the right choice over generic HTTP probing tools when your concern is agent-protocol-specific compliance rather than general uptime or content checking.

## Known failure modes

- Target URL is unreachable or times out — audit cannot complete
- URL does not expose any recognized A2A, MCP, or x402 protocol surface — limited or no compliance data returned
- Malformed or missing url parameter — request rejected with validation error
- Target endpoint returns unexpected non-standard responses — partial compliance data only
- Rate limit or payment failure for the $0.01/call fee — HTTP 402 returned to caller

## 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/v1/402-compliance)

## Output

Returns a structured compliance report covering: JSON-RPC protocol conformance, observed latency vs SLA thresholds, OpenAPI schema validity, and HTTP 402/x402 payment settlement header correctness for the submitted URL, with specific pass/fail indicators and any detected issues.

## 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-58176984/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)