# 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/x402-verifier?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-98b09f4e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1-PaDoMxnGFzqf2o7_kRS

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-98b09f4e
```

Example prompt: Can you audit https://myagent.example.com/mcp to check if it's JSON-RPC compliant, meets latency SLA, has a valid OpenAPI schema, and returns proper HTTP 402 payment headers?

## When to prefer this

Choose this endpoint when you need to programmatically verify that an A2A agent, MCP server, or x402-enabled API meets protocol standards before deploying it, listing it in a registry, or integrating it into an agent swarm. Especially valuable for pre-launch compliance checks, CI/CD pipeline validation of agentic services, and confirming HTTP 402 payment header correctness for x402 v2 monetized endpoints.

## Known failure modes

- Target URL is unreachable or returns a network error — audit fails with connectivity error
- Target URL is not an A2A/MCP/x402 endpoint — report may show all checks as non-compliant
- Malformed or missing URL parameter — returns validation error
- Target endpoint is too slow to respond — latency SLA check marked as failed
- Target blocks external probes — partial results or timeout errors returned

## 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/x402-verifier)

## Output

Returns a structured audit report containing JSON-RPC compliance pass/fail, measured latency against SLA thresholds, OpenAPI schema validation results, and HTTP 402 settlement header inspection details 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-98b09f4e/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)