# Tinstop Domain Subdomain Enumeration

> Tinstop Domain Subdomain Enumeration is a paid API for AI agents from tinstop.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).

Enumerates and discovers subdomains for a given apex domain, returning a list of discovered hosts up to a configurable limit.

## Facts

- Endpoint: POST https://tinstop.com/v1/domain/subdomains
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tinstop-domain-subdomain-enumeration-1dbf93dc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LwR49OdUXIY8rnLj98wOo

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 tinstop-domain-subdomain-enumeration-1dbf93dc -d '<json body>'
```

Example prompt: Can you enumerate all the subdomains for example.com and give me up to 50 hosts?

## When to prefer this

Choose this endpoint when you need fast, pay-per-call subdomain enumeration without setting up an account or managing API keys. It is ideal for one-off reconnaissance tasks, security audits, or agent workflows that need on-demand subdomain discovery billed in micro-payments via USDC on Base using x402.

## Known failure modes

- Invalid or non-existent domain returns empty results or error
- Payment failure via x402 if USDC balance is insufficient
- Rate limiting if too many requests are made in quick succession
- Very large domains with thousands of subdomains may be truncated to the requested limit
- Private or internal subdomains not resolvable via public DNS will not appear

## How this service works

Tinstop is a machine-payable Website Intelligence API for domain security and performance audits: DNS, SSL/TLS, HTTP security headers, SPF/DKIM/DMARC email authentication, and Google PageSpeed. Pay per call with x402 using USDC on Base. No accounts or API keys.

## Output

Returns a list of discovered subdomain hostnames (up to the specified limit) belonging to the given apex domain, including any additional metadata about each host that is available.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "limit": {
   "type": "integer",
   "description": "Max hosts to return after discovery."
  },
  "domain": {
   "type": "string",
   "description": "Apex domain to enumerate."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "title": "Response Domain Subdomains V1 Domain Subdomains Post",
 "additionalProperties": true
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tinstop-domain-subdomain-enumeration-1dbf93dc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from tinstop.com](https://www.zero.xyz/host/tinstop.com/llms.txt)