# AgentDiet x402 Verifier — A2A/MCP/HTTP 402 SLA Compliance Auditor

> AgentDiet x402 Verifier — A2A/MCP/HTTP 402 SLA Compliance Auditor is a paid API for AI agents from agentdiet.dev, paid per call via x402 or MPP, $0.01/call, status unknown (last checked 2026-10-20).

Audits any remote agent, MCP, or HTTP endpoint for JSON-RPC compliance, latency SLA, OpenAPI schema validity, and HTTP 402 payment settlement headers.

## Facts

- Endpoint: GET https://agentdiet.dev/v1/x402-verifier?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402, MPP
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentdiet-x402-verifier-a2a-mcp-http-402-sla-compliance-auditor-ab241575
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Lpf1SMp8Ol_hwFuVPO5wE

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 agentdiet-x402-verifier-a2a-mcp-http-402-sla-compliance-auditor-ab241575
```

Example prompt: Can you audit https://myagent.example.com/api using a GET request and tell me if it's x402-compliant — specifically check its JSON-RPC compliance, latency SLA, and HTTP 402 settlement headers?

## When to prefer this

Choose this endpoint when you need to programmatically verify that an AI agent, MCP server, or HTTP API endpoint properly implements the x402 payment protocol, JSON-RPC spec, and latency SLAs — especially before integrating, listing, or going live with an agent service. Prefer it over manual inspection or generic HTTP checkers because it specifically understands x402 settlement headers and agent-layer compliance requirements.

## Known failure modes

- Target URL unreachable or returns network error
- Target URL does not implement JSON-RPC at all, producing incomplete audit
- URL missing or malformed in query parameters
- Target endpoint blocks automated audit requests (rate limiting or auth)
- HTTP 402 headers absent entirely, resulting in partial audit with compliance failures

## 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://agentdiet.dev/v1/x402-verifier)

## Output

Returns an audit report covering JSON-RPC compliance status, latency SLA measurement, OpenAPI schema validation results, and HTTP 402 payment settlement header inspection for the target URL — indicating which checks passed, failed, or have warnings.

## 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/agentdiet-x402-verifier-a2a-mcp-http-402-sla-compliance-auditor-ab241575/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentdiet.dev](https://www.zero.xyz/host/agentdiet.dev/llms.txt)