domain-availability-checker.underscoredone.com
LiveDev UtilitiesGive this API up to 10 domain names and it tells you whether each has a registration record at the official registry. It uses RDAP, the stru (the service's own listing text)
20/20Recent Test Calls That Worked
134 msTypical Response Time (slow end: 231 ms)
$0.01 / $0.01Listed / Actual Price: match
Same AddressPayment Address (payTo): the same on all 18 checks of the main route
3Directories Listing It
11 min agoLast Checked (2026-10-24T11:26:34Z)
Listed Vs. Actual Price
Listed = the price in the directory listing today, for the main route we test. Actual = the price that route asked for when we called it (from our signed records). Some differences are normal, like prices that depend on the request.
| Period | Listed | Actual | Result |
|---|---|---|---|
| Recent Checks | $0.01 | $0.01 | Matches Listing |
Latest Signed Records
| Signed Record | Time (UTC) | Reply | Asked For Payment Correctly | ms | Price Asked |
|---|---|---|---|---|---|
| efce6e0e89a78aace05e | 2026-10-24T11:26:34Z | 402 | Yes | 205 | $0.01 |
| 0f819c143f99aa9172e2 | 2026-10-24T10:56:22Z | 402 | Yes | 94 | $0.01 |
| da6122b43329fc69ec73 | 2026-10-24T10:24:29Z | 402 | Yes | 153 | $0.01 |
| 792f714ff3680c77d6d3 | 2026-10-24T09:54:23Z | 402 | Yes | 134 | $0.01 |
| 89f03c6287aa3b13d9ed | 2026-10-24T09:22:32Z | 402 | Yes | 100 | $0.01 |
Every record is digitally signed, so anyone can verify it. More: raw data page · free quick check (JSON)