Tool detail
Domain Availability Checker
Checks up to 10 domain names via RDAP and reports each as registered, unregistered, or indeterminate.
Categories: Domains IP
Use when
- check whether a batch of domain names are registered
- screen candidate domain names before a purchase attempt
Not for
- not a purchase or pricing check - registration status only
- not proof a name is purchasable - reserved/premium names also show unregistered
Inputs
POST JSON body: { domains: array of 1-10 plain domain strings (no scheme/subdomain) } (required)
Inputs undocumented: array without items
Endpoint
- Method
POST- URL
https://domain-availability-checker.underscoredone.com/check
Payment
- Protocol
- x402
- Listed price
- 0.01 USDC per call on Base
- Payment method
- exact
- Network
- eip155:8453
- Asset
- 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Listed terms are catalog metadata. The caller supplies inputs and calls the tool outside Onelayer. If payment is required, the caller uses a compatible wallet to pay.
Source
- Directory
- Coinbase x402 Bazaar
- Record
- POST https://domain-availability-checker.underscoredone.com/check
- Retrieved
- 2026-09-30T20:37:07.382Z
- Catalog file SHA-256
6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524- Catalog built
- 2026-09-30T22:31:58.034Z