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Check Domain Availability
Check Domain Availability is a paid API for AI agents from domains.rapidruntime.com, paid per call via MPP, price unknown, status unknown (last checked 2026-09-14).
Checks availability and pricing for up to 50 specific domain names before registration
Price / call—
Success—
StatusUnknown
How this service works
Check availability and pricing for specific domain names. Use this before registration to confirm the exact price.
Output
Returns an array of results for each queried domain name, including the domain name, SLD, TLD, whether it is purchasable, the purchase price, renewal price, whether it is a premium domain, and the reason if unavailable.
Example use cases
Verify startup domain before registration
“Before I pull the trigger on registering it, can you check if 'novastack.ai' is available and what the purchase and renewal prices are?”
Compare pricing across multiple TLDs
“I'm deciding between 'brightpath.com', 'brightpath.io', and 'brightpath.co' — can you check which ones are available and how much each would cost to register?”
Check if rebranded domain is taken
“We're rebranding to Lunaris and I want to lock in the domain — can you check if 'lunaris.com', 'lunaris.co', and 'lunaris.app' are available and what they'd cost to buy?”
Technical details
Endpoint
POSThttps://domains.rapidruntime.com/api/v1/domains/check-availabilityWhen to prefer
Use this endpoint when you already know the exact domain names you want to check, especially before calling the registration endpoint to confirm current pricing. For exploratory keyword-based searching across many TLDs, prefer the keyword domain search endpoint instead.
Side effects
- Empty or missing domainNames array returns validation error
- More than 50 domains in the request returns a 400 error
- Malformed domain names may return unavailable or error status
- Network timeout if the upstream registry is slow to respond
- Unknown TLDs may return an unsupported or unavailable result
Input
{
"domainNames": [
"testexample.com",
"testexample.io",
"testexample.co"
]
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| domainNamesrequired | array | Domain names to check (max 50) |
Output
{
"results": [
{
"sld": "testexample",
"tld": "com",
"premium": true,
"domainName": "testexample.com",
"purchasable": true,
"purchaseType": "aftermarket_b",
"renewalPrice": 19.99,
"purchasePrice": 20698.85
},
{
"sld": "testexample",
"tld": "io",
"domainName": "testexample.io",
"purchasable": true,
"purchaseType": "registration",
"renewalPrice": 79.99,
"purchasePrice": 53.99
},
{
"sld": "testexample",
"tld": "co",
"domainName": "testexample.co",
"purchasable": true,
"purchaseType": "registration",
"renewalPrice": 48.99,
"purchasePrice": 17.99
}
]
}Schema · Response
| Field | Type | Description |
|---|---|---|
| resultsrequired | array |
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