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Bulk Domain Availability Checker
x402
Bulk Domain Availability Checker is a paid API for AI agents from bess-x402.onrender.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-28).
Checks up to 20 domain names at once for availability across one or more TLDs, returning registration status, registrar, and expiry via RDAP and DNS.
Price / call$0.004
Success—
StatusUnknown
How this service works
Check up to 20 domain names at once, or one name across several TLDs (com, ai, io...), for registration via RDAP and DNS: available or taken, registrar and expiry. Use for brainstorming product names and finding free domains.
Output
Returns a list of domain names each with an availability flag (available or taken), and for taken domains, the registrar name and expiry/registration date as retrieved via RDAP and DNS lookups.
Example use cases
Startup domain brainstorming session
“I'm naming my new fintech startup and have a shortlist: 'payvault', 'vaultpay', 'paylo', 'fintrek'. Can you check all of these across .com, .io, and .ai to see which combinations are still available?”
Single brand name across multiple TLDs
“Check if 'lunara' is available as lunara.com, lunara.io, lunara.ai, lunara.co, and lunara.app — I want to know which ones I can still register.”
Verify competitor domain ownership
“I need to know if rivalapp.com and rivalapp.io are already registered, and if so, who owns them and when they expire.”
Technical details
Endpoint
GEThttps://bess-x402.onrender.com/v1/web/domain-availability?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to check multiple domain names or TLD combinations in a single call, rather than making individual lookups. It's ideal for startup name brainstorming, bulk domain research, and comparing availability across .com, .ai, .io and other popular TLDs simultaneously at low cost ($0.004 per call).
Side effects
- Invalid or malformed domain name returns an error
- More than 20 domains in a single request may be rejected
- RDAP registry unavailable for certain obscure TLDs may return incomplete data
- Network timeout if DNS/RDAP lookups are slow
- Missing 'domains' query parameter returns a validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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