UD ships its registrar and marketplace as an API for domainers and indie hackers automating their own portfolios. The User API covers registration, DNS, listings, cart, and webhooks across UD's infrastructure.

- Custom registration flows — search, availability, and pricing across 150+ TLDs, with full registration and renewal endpoints

- Custom backordering system — build out a custom backordering system

- DNS and nameserver management — create, update, delete records programmatically across the portfolio

- Marketplace listings — create, update, and cancel listings; set BIN, Make Offer, and LTO terms via API

- Cart and checkout — build custom purchase flows on top of UD's registrar and marketplace

- Bulk portfolio operations — push, auto-renewal updates, tagging, organizing across hundreds of domains

- Real-time events — webhooks for registrations, transfers, offers, and transaction completions

Free to use. OAuth 2.0 for user-context calls, API keys for server-to-server. Standard registration, renewal, and marketplace fees apply.

Docs: hdocs.unstoppabledomains.com/user-api/overview

The Domain Finder lets you search for new domains, marketplace, and pending delete, using natural language and filters. hunstoppabledomains.com/products/ai-assistant

Build out your custom domaining workflow and stack with our user API.

Build with the Unstoppable Domains User API

What you can build

Check out the Domain Finder