# 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 conformance, and HTTP 402 payment settlement headers.

## Facts

- Endpoint: GET https://preflight.agentdiet.dev/v1/paywall-scanner?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-ce403a62
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_aW-ZnzMi17dWR0SwDtBcM

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-ce403a62
```

Example prompt: Can you audit https://api.myagent.dev/mcp for JSON-RPC compliance, check its latency SLA, and tell me whether it's correctly implementing HTTP 402 x402 payment headers?

## When to prefer this

Choose this endpoint when you need to programmatically verify that a remote agent, MCP server, or x402 paywall correctly implements protocol standards — including JSON-RPC correctness, OpenAPI schema conformance, latency SLA, and HTTP 402 settlement headers — before integrating it into an agent workflow or swarm. It is the right choice for pre-deployment compliance checks, third-party vendor due diligence, or debugging payment/protocol issues in live agent endpoints.

## Known failure modes

- Target URL is unreachable or returns a network error — audit cannot complete
- Target URL does not expose any recognized A2A, MCP, or x402 interface — results may be empty or inconclusive
- Latency SLA thresholds unavailable if target has high jitter or intermittent availability
- Invalid or malformed URL input causes request rejection
- Target endpoint blocks automated probes via rate limiting or IP filtering

## 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/paywall-scanner)

## Output

Returns a structured compliance report covering: JSON-RPC protocol adherence, measured latency against SLA thresholds, OpenAPI schema validation findings, and HTTP 402 / x402 settlement header correctness — flagging any violations or misconfigurations found at 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-ce403a62/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)