Domain API Reviews

API Provider

WhoAPI →

Established Domain Availability & WHOIS API

From $52/month for 40,000 requests

API Provider

Domainr (Fastly) →

Fastly-backed Domain Search API

From Status from $0.0005/request after the free allowance

API Provider

DNSimple →

Registrar API with DNS Hosting & Automation

From From $0.50/hosted zone/month plus DNS query usage

API Provider

WhoisXML API →

Enterprise Domain, IP & DNS Intelligence

From $30/month for 2,000 WHOIS queries

API Provider

DomainTools →

Enterprise Domain Intelligence & Threat Research

From $99/month individual membership, web access only

API Provider

JsonWhois →

Simple WHOIS API

From WHOIS from $0.0085/call after the free allowance

API Provider

WhoisFreaks →

WHOIS & DNS Intelligence API

From $75/month for 50,000 credits

API Provider

IP2WHOIS →

WHOIS API with IP2Location Integration

From $49/month for 5,000 Domain WHOIS queries

API Provider

Host.io →

Domain Intelligence and Technology Detection API

From $99/month for 10,000 requests

API Provider

Whoxy →

WHOIS history, reverse WHOIS, and bulk lookup API

From $2 one-time for 1,000 WHOIS lookups

API Provider

WHOISJSON →

WHOIS, DNS, SSL, and availability API with a lightweight free plan

From $10/month for 30,000 requests

API Provider

Atom Connect →

Domain valuation, trademark screening, and discovery APIs

From Custom pricing

API Provider

BuiltWith →

Website technology intelligence and historical stack data API

From $295/month Basic plan

API Provider

Wappalyzer →

Technology lookup, company enrichment, and alerts API

From $450/month Business plan with 20,000 API credits

API Provider

urlscan.io →

URL scanning, phishing analysis, and brand monitoring API

From $5,000/year Automate plan

API Provider

FullHunt →

External attack surface, subdomain, and typo-monitoring API

From $149/month Builder plan

API Provider

Netlas →

Internet-wide scanning, DNS, SSL, and WHOIS datasets

From $49/month Freelancer plan

API Provider

Robtex →

Passive DNS, domain reputation, and infrastructure lookup API

From $19/month Pro plan

API Provider

RDAP API →

RDAP-first domain, IP, and ASN lookup API

From $9/month Starter plan

API Provider

SecurityTrails →

DNS & Domain Intelligence for Security Research

From Contact sales

API Provider

Censys →

Internet Intelligence and Attack Surface Platform

From Prepaid credits from $100

API Provider

Shodan →

Internet Exposure Search for Devices and Services

From $49 one-time Membership or $69/month Freelancer

API Provider

VirusTotal →

Domain & URL Threat Intelligence

From $75,000/year Google Threat Intelligence Standard

API Provider

ViewDNS →

DNS, WHOIS, and Reverse Lookup Toolkit

From $29/month for 1,000 queries

API Provider

MxToolBox →

Email Security & DNS Diagnostic Tools

From $129/month Delivery Center

API Provider

HackerTarget →

Security Testing & DNS Reconnaissance

From $10/month Starter, billed annually

API Provider

DNSlytics →

Reverse DNS Analytics and Tracking Code Discovery

From €79 one-time for 10,000 credits

Registrar

GoDaddy API →

Domain Registrar API

From Live per-domain registration, renewal, and transfer pricing

Registrar

Namecheap API →

Domain Registrar API

From Production requires 20 domains, a $50 balance, or $50 recent spend

Registrar

Name.com API →

Domain Registrar REST API

From Variable per-domain and TLD transaction pricing

Registrar

Dynadot API →

Registrar API for Bulk Investors and Resellers

From Variable per-TLD domain transaction pricing

Registrar

Gandi API →

European Registrar API with LiveDNS

From Variable per-TLD pricing at Rate A

Registrar

Cloudflare Registrar →

At-Cost Registrar with Beta API Workflows

From Registry wholesale domain cost with no markup

Registrar

Porkbun API →

Low-cost registrar API with DNS and SSL automation

From Variable per-domain transaction pricing

Registrar

OpenSRS →

Reseller-focused domain API for large portfolios

From Essential reseller tier with variable domain pricing