# A2A, MCP & HTTP 402 Endpoint SLA Compliance Auditor

> A2A, MCP & HTTP 402 Endpoint SLA Compliance Auditor is a paid API for AI agents from whale-momentum.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 payment settlement headers

## Facts

- Endpoint: GET https://whale-momentum.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: whale-momentum.agentdiet.dev
- Website: https://whale-momentum.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/whale-momentum-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-539fe819
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MmkZIXxj5SLAoJHaSaqz0

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 whale-momentum-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-539fe819
```

Example prompt: Can you audit my MCP server at https://myagent.example.com/mcp and tell me whether it's JSON-RPC compliant, passing its latency SLA, and returning the right HTTP 402 settlement headers?

## When to prefer this

Use this endpoint when you need to programmatically verify that an A2A agent, MCP server, or x402 paywall URL is correctly implementing its declared protocols — especially before integration, after deployment, or as a periodic compliance health check. It is more appropriate than generic HTTP testing tools when you specifically need JSON-RPC, OpenAPI, SLA latency, and HTTP 402 settlement header validation in a single call.

## Known failure modes

- Target URL is unreachable or returns a network error
- Target URL does not implement any auditable protocol (not A2A, MCP, or x402)
- Malformed or missing URL query parameter returns a 400 error
- Target service times out, resulting in an SLA failure report
- OpenAPI schema cannot be fetched or parsed from the target

## 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://whale-momentum.agentdiet.dev/v1/paywall-check)

## Output

Returns a structured audit report covering JSON-RPC protocol compliance, measured latency vs SLA thresholds, OpenAPI schema validity, and HTTP 402/x402 settlement header correctness for the submitted 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/whale-momentum-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-539fe819/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from whale-momentum.agentdiet.dev](https://www.zero.xyz/host/whale-momentum.agentdiet.dev/llms.txt)