# 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 A2A, 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/preflight?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-14d6c442
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fxu9zIfDhmFazvoofzyFq

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-14d6c442
```

Example prompt: Can you audit this MCP server URL — https://my-agent.example.com/mcp — and tell me if it's JSON-RPC compliant, meeting latency SLA, and returning the right HTTP 402 settlement headers?

## When to prefer this

Choose this endpoint when you need to programmatically verify that an A2A agent, MCP server, or x402-enabled service URL correctly implements JSON-RPC, passes latency SLA thresholds, exposes a valid OpenAPI schema, and returns HTTP 402 payment settlement headers per the x402 v2 / IETF MPP spec — especially before deploying agents that will call those services or listing them in a registry.

## Known failure modes

- Target URL is unreachable or times out — audit may return connectivity error
- URL does not expose a valid JSON-RPC or HTTP endpoint — compliance checks fail with no-response result
- Malformed or missing URL parameter returns a 400-level validation error
- Target service returns non-standard HTTP responses that prevent header inspection
- x402 settlement headers absent or malformed — reported as non-compliant without crashing the audit

## 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/preflight)

## Output

Returns a structured audit report covering JSON-RPC compliance status, latency SLA measurement, OpenAPI schema validation outcome, and HTTP 402 / x402 settlement header inspection for the supplied 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/whale-momentum-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-14d6c442/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)