From a bare URL to the right shelf.
Send a URL and get the IAB node, two levels of category and a description, with nothing to train.
IAB IDs, not free-text guesses
Every result carries iab_id and iab_parent_id, the taxonomy your partners already speak.
Two levels of category depth
A tier-one category for routing, plus a subcategory when you need the specific.
A description you can show users
A tagline, a short description and a long one, ready for a record or a prompt.
stripe.com
Business · Business Software
netflix.com
Arts & Entertainment · Movies
nytimes.com
News · International News
booking.com
Travel · Hotels
github.com
Technology & Computing · Internet Technology
Classify websites with Claude
Ask for any URL's IAB category, or send the same request with your API key.
# claude.ai/directory/prefetch → Connect
# Sign in to Prefetch, Allow access. No key to paste.
# Claude Code on the same Claude account has it too.
# Then just ask:
Run prefetch_classify on stripe.com, netflix.com
and booking.com and group them by IAB category.What teams build with the Classify API
Ad tech & brand safety
Categorise inventory and referrer domains against the taxonomy your buyers already use, and keep campaigns off categories they exclude.
Lead routing & scoring
Sort inbound signups by industry the moment an email domain arrives, so the right rep, plan or onboarding flow is picked automatically.
Moderation & allow-lists
Screen user-submitted links before they go live and send only the ambiguous cases to a human reviewer.
Cleaning up a URL dump
Turn a spreadsheet of thousands of domains into a segmented dataset without writing a classifier or labelling a training set.
5 credits per classification
Every plan unlocks every endpoint, failed requests are free, and requests pause at your limit rather than billing past it.
Free
USD
/month
1,000 credits / month
- Up to 200 classifications
- 1 concurrent request
- 30 requests per minute
- No credit card required
Starter
USD
/month
10,000 credits / month
- Up to 2,000 classifications
- 10 concurrent requests
- Unlimited requests per minute
- Email support
- $5 per 2,500 additional credits
The same plan unlocks every other endpoint too. Each line is the whole month of 10,000 credits spent there instead of on classifications. Mix them however you like.
10,000 name lookups: Company Name to Domain API
(1 credit per lookup, a company, brand or product name in, its official website's domain out)
10,000 pages: Web Scraping API
(1 credit per page, any URL to clean markdown, a summary or structured JSON, ready for an LLM)
10,000 site maps: Sitemap API
(1 credit per call, every URL a site exposes, from its sitemaps and links, without fetching a page)
10,000 crawled pages: Web Crawling API
(1 credit per page, a whole site, or one section of it, rendered page by page into clean markdown)
10,000 screenshots: Screenshot API
(1 credit per call, any URL to a hosted image, at any viewport, full page or above the fold)
10,000 page checks: Website Monitoring API
(1 credit per page checked, pages re-checked on your schedule, with a webhook carrying only what changed)
2,000 company lookups: Company Data API
(5 credits per call, the legal entity, its size, founding year and published contacts behind a domain)
1,000 brand lookups: Brand API
(10 credits per call, logos, colors, fonts and social assets pulled from any domain)
1,000 answers: Web Research API
(10 credits per answer, a research question in, a sourced answer in your own JSON shape out)
833 enrichments: Company Enrichment API
(12 credits per call, brand, company and classification for any domain, from one page load)
Failed requests are never charged. Top-up credits are spent after your monthly credits and never expire.
Website Classification API questions
Scale with confidence. Handle thousands of requests per second on fast, reliable infrastructure.
- Registered Users
- 300+
- API calls processed
- 40k
- Uptime
- 99.9%
Ready to get started?
Create an account instantly, or contact us to design a custom package for your business.
Up in 5 minutes
Make your first API call in under 5 minutes. No setup headaches, just copy, paste, ship.
API reference
Request schemas, response examples, everything you need to integrate.