# Certificate Transparency Lookup via X402-Broker

> Certificate Transparency Lookup via X402-Broker is a paid API for AI agents from mcp-gateway.agentdiet.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-22).

Queries certificate transparency logs for a given domain, returning SSL/TLS certificate issuance records via a pay-per-call x402 gateway.

## Facts

- Endpoint: GET https://mcp-gateway.agentdiet.dev/v1/cert-transparency?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/certificate-transparency-lookup-via-x402-broker-5cc2db94
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NseF1G-3EpnWE_pwy_h6x

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 certificate-transparency-lookup-via-x402-broker-5cc2db94
```

Example prompt: Can you check the certificate transparency logs for example.com and tell me what SSL/TLS certificates have been issued for it?

## When to prefer this

Choose this endpoint when you need a pay-per-call, agent-native certificate transparency lookup that settles in USDC on Base via the x402 protocol — especially in agentic or automated pipelines where micropayment-per-query is preferred over API key subscriptions. It is well-suited for one-off certificate audits where you don't want to maintain a standing subscription to a CT log service.

## Known failure modes

- Missing or invalid domain parameter returns an error response
- Domain with no certificate transparency records returns empty data
- Payment failure (insufficient USDC balance) blocks the request with HTTP 402
- Malformed input schema (missing required 'type' or 'method' fields) causes a validation error
- Upstream certificate transparency log service unavailability may result in timeout or empty response

## How this service works

Deterministic B2A/A2A/MCP/x402/MPP/L402 execution and intelligence node at https://mcp-gateway.agentdiet.dev settling in USDC on Base.

## Output

Returns a JSON object with a status field ('ok'), a data object containing certificate transparency records for the queried domain, and an roi_proof field showing compression efficiency metadata (e.g. compression_ratio_pct: 91.4).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "POST"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "domain": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {},
  "status": "ok",
  "roi_proof": {
   "compression_ratio_pct": 91.4
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/certificate-transparency-lookup-via-x402-broker-5cc2db94/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp-gateway.agentdiet.dev](https://www.zero.xyz/host/mcp-gateway.agentdiet.dev/llms.txt)