Developers

Check, price and register domains from your own code or an AI agent. There's a REST API for your account, MCP servers for Claude, Cursor and other clients, and a public price feed. The availability check, search and price feed need no key.

Try it

curl "https://www.orbitfour.com/api/v1/domains/check?names=example.com"

No account and no key

REST API

Register, renew and transfer domains, manage DNS records and contacts, fund your prepaid balance, and get webhooks when something changes on your account.

Send an API key in the Authorization: Bearer o4_live_... header. An account owner creates keys under Account → API keys and gives each one only the scopes it needs. Registering, renewing or transferring in a domain needs billing:write as well as domains:write; a balance deposit needs only billing:write.


            domains:read


            domains:write


            domains:transfer


            dns:read


            dns:write


            contacts:read


            contacts:write


            account:read


            billing:write


            webhooks:write

API reference

Every endpoint and schema, and you can try each call in the browser.

/api/v1/docs

OpenAPI 3 spec

The machine-readable spec, for generating a client in your language.

/api/v1/openapi

MCP servers

Public server

https://www.orbitfour.com/mcp

Check availability, search for names, read an extension's requirements and check a transfer. No account and no key.


                check_domain


                search_domains


                get_tld_requirements


                check_transfer

Your account

https://www.orbitfour.com/mcp/account

Your domains, DNS records, contacts and billing, one tool per REST operation. Connect with an API key, or sign in from a hosted client like Claude.

Set up Claude, Cursor or VS Code

No key needed

Availability and search

GET/api/v1/domains/check?names=example.com
Availability and price for up to 10 names, comma-separated.
GET/api/v1/domains/search?q=example
Name suggestions across extensions. Check a name before you quote it.
GET/api/v1/transfers/check?domains=example.com
Whether up to 5 names held elsewhere can move here, and the price.

Price feed

GET/api/v1/pricing
Every extension we sell, with its prices and registry rules: term lengths, transfer period, grace and redemption windows.
GET/api/v1/pricing.csv
The same catalog as CSV.
GET/api/v1/pricing/us
One extension, plus what registering it requires. Swap us for any extension we sell.

Together with the public MCP server, these allow 30 requests a minute per IP address; Claude and ChatGPT connectors, which share their providers' addresses, get a higher limit. Over the limit, you get HTTP 429 with a Retry-After header.

For AI agents

GET/llms.txt
A short index of everything on this page, in the llms.txt format.
GET/llms-full.txt
The integration guide: step-by-step workflows, every error code and when to retry it, and the registry rules the spec can't express.

Ready to build?

Create an API key

Questions or problems? Contact us.