# A2A, MCP & HTTP 402 Endpoint SLA Compliance Auditor

> A2A, MCP & HTTP 402 Endpoint SLA Compliance Auditor is a paid API for AI agents from defi-yield.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-28).

Audits any A2A, MCP, or x402 service URL for JSON-RPC compliance, latency SLA, OpenAPI schema validity, and HTTP 402 payment settlement headers

## Facts

- Endpoint: POST https://defi-yield.agentdiet.dev/v1/preflight/certify?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Provider: defi-yield.agentdiet.dev
- Website: https://defi-yield.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/defi-yield-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-ac4f92e3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LoEH4oQeP_j0G884IdGSV

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 defi-yield-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-ac4f92e3 -d '<json body>'
```

Example prompt: Can you run a full compliance audit on https://my-agent-service.example.com/mcp — check if it's JSON-RPC compliant, passing latency SLA, has a valid OpenAPI schema, and supports proper HTTP 402 settlement headers?

## When to prefer this

Choose this endpoint when you need an automated, multi-dimension compliance check of a remote A2A, MCP, or x402-enabled service covering JSON-RPC correctness, latency SLA, OpenAPI schema, and HTTP 402 payment headers in a single call — especially useful before integrating an external agent tool or listing a service in an agent marketplace.

## Known failure modes

- Target URL is unreachable or returns a non-2xx response — audit fails with connectivity error
- URL does not expose a JSON-RPC or MCP-compatible interface — compliance checks return failed/not-applicable
- Latency SLA check times out if the remote endpoint is slow to respond
- Malformed or missing OpenAPI schema at the target returns schema validation errors
- HTTP 402 headers absent or malformed result in x402 compliance failure flags

## 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://defi-yield.agentdiet.dev/v1/preflight/certify)

## Output

Returns a structured audit report covering JSON-RPC protocol compliance, measured latency vs SLA thresholds, OpenAPI schema validation findings, and HTTP 402 / x402 settlement header inspection results 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/defi-yield-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-compliance-ac4f92e3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from defi-yield.agentdiet.dev](https://www.zero.xyz/host/defi-yield.agentdiet.dev/llms.txt)