RDAP API review
RDAP-first domain, IP, and ASN lookup API
Quick facts
- Category
- WHOIS and RDAP APIs, Domain availability APIs
- Website
- rdapapi.io
- Pricing starts at
- $9/month Starter plan
- Free tier
- Seven-day free trial on every plan
- How usage is billed
- Credits, pages, requests, records, compute units, subscriptions, and browser-time blocks are not interchangeable.
- Enterprise plan
- $199/month Business plan
What RDAP API is
RDAP API centers on RDAP lookups for domains, IP ranges, and ASNs for teams that want structured registration data without buying a larger intelligence platform.
Compared in: WHOIS and RDAP APIs, Domain availability APIs.
Strengths
- Focused RDAP experience for domains, IPs, and ASNs
- Seven-day free trial on every plan
Limitations
- No valuation, threat monitoring, or naming workflow
Pricing summary
Figures come from published RDAP API sources checked on 2026-07-29, linked under Sources. Plans and limits change, so confirm them with the vendor before you buy.
| Plan | RDAP API | DomScan |
|---|---|---|
| Free tier | Seven-day free trial on every plan | Free: 10,000 credits/month |
| Entry paid plan | $9/month Starter plan | Pay-as-you-go from $10 |
| Enterprise | $199/month Business plan | Custom pricing |
- Credits, pages, requests, records, compute units, subscriptions, and browser-time blocks are not interchangeable.
Who RDAP API suits
Good fit
Stay with RDAP API if your product centers on clean RDAP retrieval and normalization for domains, IPs, and ASNs.
Weaker fit
- You need availability checks beyond RDAP lookups
- You want DNS, valuation, and monitoring in one API
- You want a free monthly allowance, not a seven-day trial
- You need SSL and email security checks too
RDAP API vs DomScan
Feature availability for RDAP API comes from its published product documentation. DomScan credit costs come from its published endpoint pricing.
| Feature | RDAP API | DomScan |
|---|---|---|
| Free tier | Limited | ✓ 10,000/month |
| Domain availability | ✓ | ✓ |
| WHOIS data | ✓ | ✓ |
| DNS lookup | − | ✓ |
| Domain valuation | − | ✓ |
| Brand monitoring | − | ✓ |
| MCP/AI integration | − | ✓ |
| Bulk operations | Limited | ✓ |
DomScan products for the same jobs
These DomScan products cover the categories where RDAP API competes. Each shows its published credit cost per request.
Credits per request: 3
RDAP Lookup
Instant RDAP lookup for domains. Pull registrar, status, and expiry data in seconds.
Credits per request: 2
Check Domain Availability
Check if a domain name is available across one or more TLDs.
Credits per request: 1
Verdict
Main strength of RDAP API: Focused RDAP experience for domains, IPs, and ASNs. Main trade-off: No valuation, threat monitoring, or naming workflow. If you need several kinds of domain, DNS or web data from one API key, DomScan publishes the credit cost of every endpoint and includes 10,000 free credits each month.
Frequently asked questions
What is RDAP API?
RDAP API centers on RDAP lookups for domains, IP ranges, and ASNs for teams that want structured registration data without buying a larger intelligence platform.
How much does RDAP API cost?
Published pricing checked on 2026-07-29. Free tier: Seven-day free trial on every plan. Entry paid plan: $9/month Starter plan. Enterprise: $199/month Business plan.
When is RDAP API the better choice?
Stay with RDAP API if your product centers on clean RDAP retrieval and normalization for domains, IPs, and ASNs.
How does RDAP API pricing compare with DomScan?
RDAP API and DomScan count usage in different units, so there is no exact per-request comparison. DomScan includes 10,000 free credits every month and publishes the credit cost of every endpoint, so you can price the operations you plan to run.
Sources
Last updated:
