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Domain Age Checker
x402
Domain Age Checker is a paid API for AI agents from domain-age-checker.underscoredone.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Looks up registration age, creation date, expiration date, and time remaining for one or more domain names (up to 50 per request)
Price / call$0.01
Success—
StatusUnknown
How this service works
Send a list of domain names and this tool tells you exactly how old each one is, when it was first registered, when it expires, and how much time is left before expiration. Great for spotting brand-new suspicious domains, researching competitors, or evaluating domains before buying or linking to them. Works with over 100 domain extensions worldwide.
Output
For each domain in the input list, the agent receives its age (time since first registration), the original registration/creation date, the expiration date, and the remaining time before expiration. Supports over 100 domain extensions worldwide.
Example use cases
Example prompt
“Can you check how old these domains are and when they expire: 'trustwalletclaims.xyz', 'paypal-support-center.net', and 'opensea-airdrop.io'? I want to see if they're suspiciously new.”
Technical details
Endpoint
POSThttps://domain-age-checker.underscoredone.com/lookupWhen to prefer
Use this endpoint when you need quick, structured domain age and expiry data for one or more domains in a single call — especially for fraud detection (spotting brand-new suspicious domains), pre-purchase domain evaluation, competitor research, or link vetting. Supports bulk lookups of up to 50 domains at once across 100+ TLDs, making it more efficient than manual WHOIS lookups per domain.
Side effects
- Domain not found in registry (unregistered or unsupported TLD)
- Input list exceeds 50 domains per request
- Malformed domain name in the input array
- WHOIS data unavailable or rate-limited for certain TLDs
- Network timeout or upstream registry unreachable
Input
{
"domains": [
"example.com",
"google.com",
"github.com"
]
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| domains | array | A list of domain names you want to look up. You can include plain domains like 'example.com' or full web addresses like 'https://example.com/page' — both work. Maximum 50 domains per request. |
Output
{
"total": 3,
"failed": 0,
"results": [
{
"age": "30 Years 10 Months 10 Days",
"status": "success",
"domainName": "example.com",
"expiringIn": "2 Months 1 Day",
"expirationDate": "2026-08-13",
"lastUpdateDate": "2026-01-16",
"registrationDate": "1995-08-14"
},
{
"age": "28 Years 9 Months 7 Days",
"status": "success",
"domainName": "google.com",
"expiringIn": "2 Years 3 Months 4 Days",
"expirationDate": "2028-09-14",
"lastUpdateDate": "2024-08-02",
"registrationDate": "1997-09-15"
},
{
"age": "18 Years 8 Months 10 Days",
"status": "success",
"domainName": "github.com",
"expiringIn": "3 Months 29 Days",
"expirationDate": "2026-10-09",
"lastUpdateDate": "2024-09-07",
"registrationDate": "2007-10-09"
}
],
"succeeded": 3,
"api_version": "1.0.0",
"processed_at": "2026-06-12T04:28:45Z"
}Schema · Response
{
"type": "json",
"example": {
"total": 2,
"failed": 0,
"results": [
{
"age": "26 Years 10 Months 12 Days",
"status": "success",
"domainName": "google.com",
"expiringIn": "3 Years 1 Month 18 Days",
"expirationDate": "2028-09-14",
"lastUpdateDate": "2024-09-07",
"registrationDate": "1997-09-15"
},
{
"age": "9 Years 3 Months 5 Days",
"status": "success",
"domainName": "openai.com",
"expiringIn": "11 Months 22 Days",
"expirationDate": "2026-04-18",
"lastUpdateDate": "2024-11-01",
"registrationDate": "2015-04-18"
}
],
"succeeded": 2,
"api_version": "1.0.0",
"processed_at": "2024-07-27T14:22:01Z"
}
}Tags
x402
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