World Of Taxonomy
Pricing

Start free, scale as you grow

The full knowledge graph is available on every plan. Pro adds higher limits, the /classify API, MCP HTTP-mode, bulk export, and email support. Cancel anytime.

Free

For exploration and prototyping

$0/ month
  • 200 req/min authenticated
  • All read endpoints
  • Crosswalk translations
  • 20 /classify calls/day
  • MCP server (stdio mode)
  • Community support
Get started free
Most popular

Pro

For production applications

$49/ month

or $490 / year(save 17%)

  • 5,000 req/min, unlimited daily
  • 200 /classify calls/day included
  • $0.05/call overage (no hard cap)
  • MCP HTTP-mode (hosted)
  • Bulk JSON export per system
  • Webhook notifications
  • Per-key analytics dashboard
  • Email support, 14-day trial

Enterprise

For teams and organizations

Contact us
  • 50,000+ req/min, custom
  • Unlimited /classify
  • 99.9% SLA
  • Private classification systems
  • Audit log export
  • Dedicated support channel
  • Annual contract, invoiced
Contact us

Frequently asked questions

Is the free tier actually free?

Yes. Search, browse, translate, MCP stdio mode, and 20 /classify calls per day at no cost. Rate limits apply (200 req/min authenticated, 50,000 per day) to keep the service reliable.

What is /classify overage?

Pro includes 200 /classify calls per day. If you exceed that on a given day, additional calls succeed (no hard cap) and we add $0.05 per overage call to your next monthly invoice via Stripe metered billing.

Can I cancel anytime?

Yes. Cancel from the Stripe Customer Portal (linked from /developers/keys after you sign up). You keep Pro until the end of your current billing period; no future charges. No refunds for partial periods.

Can I self-host instead?

Absolutely. The entire project is MIT-licensed open source. Clone the repo, bring your own PostgreSQL, run the ingesters, and you have full control with no rate limits.

What MCP clients are supported?

Any MCP-compatible client - Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, and more. Pro includes hosted MCP HTTP mode so you can connect from clients that do not run a local stdio server.

How are payments processed?

Stripe handles all card processing. We never see your card number. Cards are stored by Stripe; we store only a customer ID. PCI compliance is Stripe’s problem, not yours.

Need something custom?

Tell us about your use case and we'll put together an Enterprise plan that fits.

Contact us