Free, open-source registrar plugins connect your billing system to OSIR. Your customers search, register, transfer and renew domains where they already are; we register them and charge your reseller balance. FOSSBilling is available today, a WHMCS module is in development and a Blesta module is planned.
FOSSBilling: free and open-source plugin, Apache License 2.0, version 1.1.0
Registration, transfer-in, renewal, nameservers, contacts, transfer lock and WHOIS privacy
Import the whole catalog of around 450 TLDs with your own markup
Domains you already hold with us become orders for the right customers, with nothing charged
Every registration and renewal is charged exactly once, even if the connection drops
Your customers see your brand, never ours
Frequently asked questions
Which billing systems can sell domains through us?
FOSSBilling today, through a free open-source registrar plugin that OSIR publishes and maintains. A WHMCS module is in development and a Blesta module is planned, with no release date for either yet.
What does the FOSSBilling plugin cost?
Nothing. It is free and open source under the Apache License 2.0. You pay the OSIR reseller price for each registration, renewal and transfer, taken from your balance, and you set your own selling prices.
Do my customers see your brand?
No. Your customers stay in your billing system, with your brand and your prices. The plugin adds no branding of ours, and its error messages never reveal your balance or account details.
What if my billing system is not listed?
Every domain operation is available over the OSIR REST API, the CLI and the MCP server, so any billing system that can call an HTTP API can sell domains.