# A2A, MCP & HTTP 402 Endpoint SLA Compliance Auditor

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

Audits a remote agent, MCP, or x402 service URL for JSON-RPC compliance, latency SLA, OpenAPI schema validity, and HTTP 402 settlement headers.

## Facts

- Endpoint: GET https://hn-pulse.agentdiet.dev/v1/paywall-check?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: hn-pulse.agentdiet.dev
- Website: https://hn-pulse.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/hn-pulse-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-auditor-f099d68b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1TMupyIJAG1YQdHJDobSU

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 hn-pulse-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-auditor-f099d68b
```

Example prompt: Can you audit https://my-mcp-server.example.com/mcp for JSON-RPC compliance, latency SLA, OpenAPI schema validity, and HTTP 402 payment header support?

## When to prefer this

Use this endpoint when you need to programmatically verify that a specific A2A, MCP, or x402 service URL is protocol-compliant before integration, deployment, or marketplace listing — especially when you need a combined JSON-RPC, SLA, OpenAPI, and HTTP 402 audit in a single call rather than running separate checks.

## Known failure modes

- Target URL is unreachable or returns a network error — audit fails with connection error
- Target URL does not implement any recognized protocol (A2A, MCP, x402) — partial or empty compliance report
- Malformed URL provided — validation error returned
- Target endpoint is too slow to respond within audit timeout — latency SLA marked as failed
- HTTP 402 headers absent or misconfigured — compliance check marks payment settlement as non-conformant

## 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://hn-pulse.agentdiet.dev/v1/paywall-check)

## Output

Returns a compliance report covering JSON-RPC protocol adherence, measured latency against SLA thresholds, OpenAPI schema validity, 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/hn-pulse-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-auditor-f099d68b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from hn-pulse.agentdiet.dev](https://www.zero.xyz/host/hn-pulse.agentdiet.dev/llms.txt)