# 54ch10 TLS Certificate Lookup

> 54ch10 TLS Certificate Lookup is a paid API for AI agents from 54ch10.uk, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Retrieves TLS/SSL certificate details for a given domain as part of a pre-interaction security brief

## Facts

- Endpoint: GET https://54ch10.uk/v1/tls
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/54ch10-tls-certificate-lookup-893dc72d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_H1ec3jBQclwVyj3V2Zk5t

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 54ch10-tls-certificate-lookup-893dc72d
```

Example prompt: Before I interact with defi-airdrop-claim.xyz, can you pull the TLS certificate details — who issued it, when it expires, and whether it looks legit?

## When to prefer this

Use this endpoint when you need a quick TLS certificate lookup for a specific domain as part of a broader pre-interaction security check — especially before a crypto wallet interaction, DeFi protocol connection, or clicking a suspicious URL. It is purpose-built for Web3 security screening contexts and pairs naturally with the other 54ch10 sibling endpoints (phishing, wallet risk, honeypot checks). Prefer this over generic WHOIS or cert-transparency tools when you need a lightweight, agent-callable, pay-per-use check without setting up infrastructure.

## Known failure modes

- Domain not found or DNS resolution failure — likely returns ok: false or error
- Invalid or missing domain query parameter — returns 400-level error
- Domain has no TLS certificate — may return null or error fields for cert data
- Rate limiting or payment failure via x402 — returns 402 Payment Required
- Expired or self-signed cert data returned accurately but may appear alarming without context

## How this service works

54ch10: pre-interact URL check. Paste a link, get brief + domain + page. Taste /v1/open/free. 80 calls for $1. Wire in 30s. Analytics-only tooling. Not financial advice.

## Output

Returns a JSON object with an ok boolean, the domain queried, the TLS certificate issuer (distinguished name string), the certificate's not_before and not_after validity dates, the service tier, and a disclaimer noting that results are informational heuristics only.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    },
    "queryParams": {
     "type": "object",
     "required": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string",
       "description": "Domain name"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "tier": "x402",
  "domain": "example.com",
  "issuer": "C=US, O=Let's Encrypt",
  "not_after": "2026-04-01T00:00:00",
  "disclaimer": "Informational tooling only. Not financial advice. No custody, trading, or token promotion. Scores are imperfect heuristics — verify independently.",
  "not_before": "2026-01-01T00:00:00"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/54ch10-tls-certificate-lookup-893dc72d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 54ch10.uk](https://www.zero.xyz/host/54ch10.uk/llms.txt)