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Domain Age Checker by underscoredone.com
x402
Domain Age Checker by underscoredone.com is a paid API for AI agents from underscoredone.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Looks up registration age, first registration date, expiration date, and time remaining for a list of domain names
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
Returns for each queried domain: how old it is, its first registration date, its expiration date, and the time remaining before it expires. Supports up to 50 domains per request across 100+ domain extensions worldwide.
Example use cases
Vetting domains before linking
“Before I add these sites to our resource page, can you look up the registration age and expiration dates for healthtips-daily.com, wellness-hub.net, and naturecures.org? I only want to link to established domains that have been around for a while.”
Bulk competitor domain research
“I'm doing a competitive analysis and want to know when these domains were first registered and when they expire: rivalco.com, competitorhq.net, and marketleader.io. Can you pull the registration history for all three?”
Flagging suspicious newly registered domains
“Our fraud team flagged some URLs in recent phishing reports — can you check the age and registration dates for secure-login-update.com, account-verify-now.net, and banking-alert-service.org? I need to know if any of them were registered in the last few weeks.”
Technical details
Endpoint
POSThttps://underscoredone.com/domain_age_checker/lookupWhen to prefer
Use this endpoint when you need to quickly check the age, registration, or expiration details of one or more domains — especially when evaluating whether a domain is newly registered (a potential fraud signal), researching competitor history, vetting domains before buying or linking, or doing bulk domain intelligence research across many TLDs.
Side effects
- Invalid or malformed domain names may return an error or null results
- Domains with privacy-protected WHOIS records may have incomplete registration data
- Exceeding 50 domains per request may result in a validation error
- Unsupported or obscure TLDs may not return complete data
- Network timeout if the WHOIS lookup takes too long
- Payment failure via x402 protocol preventing the request from completing
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 6 Days",
"status": "success",
"domainName": "example.com",
"expiringIn": "2 Months 5 Days",
"expirationDate": "2026-08-13",
"lastUpdateDate": "2026-01-16",
"registrationDate": "1995-08-14"
},
{
"age": "28 Years 9 Months 3 Days",
"status": "success",
"domainName": "google.com",
"expiringIn": "2 Years 3 Months 8 Days",
"expirationDate": "2028-09-14",
"lastUpdateDate": "2024-08-02",
"registrationDate": "1997-09-15"
},
{
"age": "18 Years 8 Months 6 Days",
"status": "success",
"domainName": "github.com",
"expiringIn": "4 Months 3 Days",
"expirationDate": "2026-10-09",
"lastUpdateDate": "2024-09-07",
"registrationDate": "2007-10-09"
}
],
"succeeded": 3,
"api_version": "1.0.0",
"processed_at": "2026-06-08T04:30:09Z"
}Schema · Response
| Field | Type | Description |
|---|---|---|
| totalrequired | number | |
| failedrequired | number | |
| resultsrequired | array | |
| succeededrequired | number | |
| api_versionrequired | string | |
| processed_atrequired | string |
Tags
x402
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