# A2A, MCP & HTTP 402 Endpoint SLA Compliance Auditor

> A2A, MCP & HTTP 402 Endpoint SLA Compliance Auditor is a paid API for AI agents from polymarket-odds.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-23).

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

## Facts

- Endpoint: POST https://polymarket-odds.agentdiet.dev/v1/preflight/certify?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: polymarket-odds.agentdiet.dev
- Website: https://polymarket-odds.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/polymarket-odds-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-4e66e2c6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_A4jvCbXsi3IHoXlh8PIPo

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 polymarket-odds-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-4e66e2c6 -d '<json body>'
```

Example prompt: Can you audit the MCP server at https://my-agent-tool.example.com for JSON-RPC compliance, latency SLA, and HTTP 402 payment header support, and tell me if it passes certification?

## When to prefer this

Choose this endpoint when you need to certify that an MCP server, A2A agent endpoint, or x402-payment-enabled API meets protocol standards before integration or deployment. Especially valuable when you need to simultaneously check JSON-RPC compliance, OpenAPI schema validity, latency SLA, and HTTP 402 payment headers in a single auditing call, rather than writing custom probe scripts or manually inspecting headers.

## Known failure modes

- Target URL is unreachable or returns a connection timeout — audit fails with connectivity error
- Target URL returns malformed or non-JSON-RPC responses — compliance marked as failed
- Invalid or missing URL in request body — returns 400 bad request
- Target service blocks probe requests (firewall/rate limiting) — partial or failed audit result
- HTTP 402 headers absent on a service expected to support x402 — compliance gap reported
- Latency SLA breach detected — SLA compliance marked as failed in output

## 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://polymarket-odds.agentdiet.dev/v1/preflight/certify)

## Output

Returns a structured audit report covering: JSON-RPC compliance status, measured latency vs SLA thresholds, OpenAPI schema validation findings, HTTP 402 and x402 payment settlement header presence and correctness, and an overall compliance certification verdict 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/polymarket-odds-agentdiet-dev-a2a-mcp-http-402-endpoint-sla-4e66e2c6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from polymarket-odds.agentdiet.dev](https://www.zero.xyz/host/polymarket-odds.agentdiet.dev/llms.txt)