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

## Facts

- Endpoint: GET https://preflight.agentdiet.dev/v1/bazaar-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-542244fb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_b8lIBvCxs0miTLhkJe7oj

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-542244fb
```

Example prompt: Can you audit https://api.myagent.dev/mcp for JSON-RPC compliance, check its latency SLA, and verify it has proper HTTP 402 x402 payment headers?

## When to prefer this

Choose this endpoint when you need to programmatically verify that a specific A2A agent, MCP server, or x402-enabled URL meets protocol compliance standards before integration or listing. It is distinct from general uptime monitoring — it performs deep inspection of JSON-RPC compliance, HTTP 402 payment header structure, OpenAPI schema, and latency SLA in a single call, making it ideal for pre-deployment audits, marketplace listing checks, or automated CI/CD compliance gates for agent infrastructure.

## Known failure modes

- Target URL is unreachable or returns a network error — audit fails with connectivity error
- Target URL does not implement any recognized protocol (A2A, MCP, x402) — returns non-compliant status with no specific violations
- Latency too high to measure within timeout window — SLA check returns timeout failure
- Invalid or malformed URL input — returns validation error before probe is attempted
- Target endpoint blocks automated probes — may return partial results or access-denied status

## 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/bazaar-verifier)

## Output

Returns a structured compliance report indicating JSON-RPC spec adherence, measured latency against SLA thresholds, OpenAPI schema validity, and presence/correctness of HTTP 402 x402 payment settlement headers for the audited 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-542244fb/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)