# AgentDiet Paywall Check — HTTP 402 & MCP SLA Compliance Auditor

> AgentDiet Paywall Check — HTTP 402 & MCP 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 a remote agent, MCP, or HTTP endpoint for JSON-RPC compliance, latency SLA, OpenAPI schema validity, and HTTP 402 payment header conformance.

## Facts

- Endpoint: GET https://agentdiet.dev/v1/paywall-check?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-paywall-check-http-402-mcp-sla-compliance-auditor-31f9e0b6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_aci9YNrP6Av5xMGtMssOS

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-paywall-check-http-402-mcp-sla-compliance-auditor-31f9e0b6
```

Example prompt: Can you audit https://example-agent.dev/v1/tool to check whether it properly supports HTTP 402 payment headers, passes JSON-RPC compliance, and meets latency SLA requirements?

## When to prefer this

Choose this endpoint when you need to programmatically verify that a remote agent, MCP server, or HTTP API correctly implements the HTTP 402 (x402) payment protocol, JSON-RPC spec, and latency SLAs — especially before integrating it into an agent swarm or marketplace listing. Prefer this over manual curl-based testing or generic HTTP monitoring tools when you specifically need structured compliance output against A2A/MCP/x402 standards.

## Known failure modes

- Target URL is unreachable or times out — audit fails with connectivity error
- Target URL does not return any recognizable agent/MCP response — partial or inconclusive audit
- Invalid or missing URL query parameter — request rejected with validation error
- Target URL blocks probing requests (e.g. IP allowlist) — false negative compliance result
- Malformed JSON-RPC response at target — compliance check flags as non-compliant even if intentional

## 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/paywall-check)

## Output

Returns an audit report covering: JSON-RPC protocol compliance status, measured latency against SLA thresholds, OpenAPI schema validity, and correctness of HTTP 402 payment/settlement headers 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/agentdiet-paywall-check-http-402-mcp-sla-compliance-auditor-31f9e0b6/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)