← Domains & DNS
domains by fourzerotwo
Domain availability
Registered or available, straight from the TLD registry.
Domain availability
Registered or available, straight from the TLD registry.
- price
- $0.002 / call
- free tier
- 3 free / day
- MCP tool
- domains__availability
- method
- GET
GET https://fourzerotwo.si/v1/domains/availability
| Param | Type | Description |
|---|---|---|
| domain | string | Domain |
# unpaid: returns 402 with the price curl -i "https://fourzerotwo.si/v1/domains/availability?domain=some-unregistered-name-402.com" # free tier: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/domains/availability?domain=some-unregistered-name-402.com"
Use it from an AI agent (MCP)
Add the server once, then ask for this data in plain English. The agent finds the endpoint with search_apis and runs it with call_api.
{
"mcpServers": {
"fourzerotwo": { "type": "http", "url": "https://fourzerotwo.si/mcp" }
}
}
# the call the agent makes
call_api {"tool": "domains__availability", "arguments": {"domain":"some-unregistered-name-402.com"}}
More from Domains & DNS
- Domain registration facts — Registrar, created, expiry, age, status codes, nameservers and DNSSEC.
- DNS records — A, AAAA, MX, NS, TXT, CNAME and CAA records (or one type).
- IP owner — Network, organisation, range, country and abuse email for an IP, from the regional internet registry.
- DMCA agent — Published DMCA / abuse contact (email or form) for a major platform, host, CDN or registrar.
- Where to report a site — Everyone to send an abuse or takedown report to for a site: platform agent, hosting network (+ abuse email, CD...
- Email authentication check — MX, SPF and DMARC for a domain, the mail provider, issues found and a grade.
Registration data from registry RDAP services; DNS from live queries.