Pricing

from $5.00 / 1,000 domain checks

Domain Availability Checker

Fast, reliable domain availability checker using RDAP with automatic WHOIS fallback. Check one domain across up to 10 TLDs in a single request. Supports .com, .net, .org, .io, .ai, .dev, .app + custom RDAP endpoints. Structured JSON output with status, source & response time.

Pricing

from $5.00 / 1,000 domain checks

Rating

0.0

(0)

Developer

Kal

Actor stats

Bookmarked

Total users

Monthly active users

3 days ago

Last modified

Features

⚡ RDAP-first — Uses the modern RDAP protocol for fast, structured lookups
🔄 WHOIS fallback — Automatically retries with WHOIS if RDAP is unavailable or inconclusive
🌐 Multi-TLD — Check up to 10 TLDs per run (.com, .net, .org, .io, .ai, .dev, .app, …)
🎯 Custom RDAP endpoints — Override or add RDAP endpoints for any TLD
🔁 Built-in retries — Automatic retry with backoff on rate limits (429) and server errors (503)
💰 Pay-per-event pricing — First 5 domain checks free, then $0.005 per check

Input

Field	Type	Required	Description
`domain`	`string`	✅	Base domain name without TLD (e.g. `myproject`)
`tlds`	`string[]`	❌	TLDs to check, max 10. Defaults to `["com", "net", "org"]`
`rdapEndpoints`	`object`	❌	Custom RDAP endpoint URLs keyed by TLD

Example input

{
    "domain": "myproject",
    "tlds": ["com", "net", "org", "io", "ai"],
    "rdapEndpoints": {
        "xyz": "https://rdap.nic.xyz/domain/"
    }
}

Output

Results are stored in the default dataset. Each row contains:

Field	Type	Description
`domain`	`string`	Full domain checked (e.g. `myproject.com`)
`status`	`string`	`AVAILABLE`, `REGISTERED`, or `UNKNOWN`
`source`	`string`	Protocol used (`RDAP` or `WHOIS`)
`tld`	`string`	TLD that was checked
`response_time`	`number`	Lookup time in seconds
`checked_at`	`string`	ISO 8601 timestamp

Example output

[
    {
        "domain": "myproject.com",
        "status": "REGISTERED",
        "source": "RDAP",
        "tld": "com",
        "response_time": 0.32,
        "checked_at": "2026-02-14T19:30:00.000Z"
    },
    {
        "domain": "myproject.io",
        "status": "AVAILABLE",
        "source": "RDAP",
        "tld": "io",
        "response_time": 0.45,
        "checked_at": "2026-02-14T19:30:01.000Z"
    }
]

Pricing

This Actor uses pay-per-event pricing:

Tier	Domain checks	Cost
🆓 Free	First 5 per run	$0.00
💳 Paid	6th check onwards	$0.005 per check

The Actor automatically stops if the user's spending limit is reached.

Built-in RDAP endpoints

The following TLDs have pre-configured RDAP endpoints:

TLD	Endpoint
`.com`	`rdap.verisign.com`
`.net`	`rdap.verisign.com`
`.org`	`rdap.publicinterestregistry.net`
`.io`	`rdap.nic.io`
`.ai`	`rdap.nic.ai`
`.dev`	`rdap.dev`
`.app`	`rdap.nic.google`

For other TLDs without a pre-configured endpoint, the Actor will use WHOIS directly. You can add your own endpoints via the rdapEndpoints input field.

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