# Delx Domain Label

> Delx Domain Label is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Splits a hostname string into its DNS labels, guesses the registrable apex domain, and returns the label count.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/domain-label
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-domain-label-aec83668
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jK6UkMybJ4sMarNX-PxCF

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 delx-domain-label-aec83668 -d '<json body>'
```

Example prompt: Can you split the hostname 'api.payments.example.co.uk' into its DNS labels and tell me what the apex registrable domain is?

## When to prefer this

Choose this endpoint when you need a lightweight, local, no-network DNS label decomposition for agent reasoning about host strings — particularly when you want to identify the registrable apex domain without making external DNS lookups or requiring API keys. It costs only $0.001 USDC per call and retains no data.

## Known failure modes

- Empty or missing host field returns an error
- Malformed host strings (e.g. with spaces or invalid characters) may produce unexpected label splits
- IP addresses passed as host may not yield a meaningful apex domain guess
- Payment authorization failure via x402 returns a 402 status before processing occurs

## How this service works

Split host into DNS labels and apex guess. Call when you reason about registrable domains from agent host strings. Returns labels, apex, count for $0.001 USDC via x402 on Base. No network, no keys, no retention; first-party local JSON only. Results are advisory; the caller owns budgets, auth, and production controls.

## Output

Returns a JSON object containing the ordered list of DNS labels split from the input host string, the guessed apex/registrable domain, and the total count of labels.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "host": {
   "type": "string",
   "description": "Input field: host."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "apex": "delx.ai",
  "count": 3,
  "labels": [
   "api",
   "delx",
   "ai"
  ],
  "schema": "delx/util-domain-label/v1"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-domain-label-aec83668/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.delx.ai](https://www.zero.xyz/host/api.delx.ai/llms.txt)