# the402.ai Domain Availability Check

> the402.ai Domain Availability Check is a paid API for AI agents from api.the402.ai, paid per call via x402, $0.002/call, status down (last checked 2026-09-15).

Checks whether a domain name is available for registration

## Facts

- Endpoint: POST https://api.the402.ai/v1/services/svc_895fe51a11304799/purchase
- Price: $0.002/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 2
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-the402-ai-b2bb5cc0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TJXg7LZWe71h-TrY9lPb5

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 api-the402-ai-b2bb5cc0 -d '<json body>'
```

Example prompt: Can you check if 'rocketlaunch.ai' is available to register as a domain?

## When to prefer this

Use this endpoint when an AI agent needs to verify domain availability programmatically, especially within automated workflows that involve brand creation, startup naming, or web presence setup. It is billed per call at $0.002 USDC via x402, making it cost-effective for single or batch lookups without a domain registrar account.

## Known failure modes

- Invalid domain format returns an error
- Unsupported TLD may return no result
- Payment failure via x402 protocol results in no response
- Rate limiting or service downtime returns HTTP error
- Ambiguous or punycode domain may fail validation

## How this service works

Purchase: Domain Availability

## Output

Returns whether the specified domain name is available for registration, along with any relevant registration details or alternative suggestions.

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "job_id": {
   "type": "string"
  },
  "status": {
   "type": "string"
  },
  "thread_id": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-the402-ai-b2bb5cc0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.the402.ai](https://www.zero.xyz/host/api.the402.ai/llms.txt)