The Registry Fee Extension for EPP fee-1.0 support will also be made available in other Tucows Registry Services instances. We will announce the availability and timelines for additional instances accordingly.
Implementation Details
We have implemented fee-1.0 extension support to accommodate registrars transitioning from Radix current Registry Service Provider (RSP). This enhancement demonstrates our commitment to minimizing disruption during transitions and supporting diverse technical requirements.
Dual Fee Extension Support
Both fee-0.7 (urn:ietf:params:xml:ns:fee-0.7) and fee-1.0 (urn:ietf:params:xml:ns:epp:fee-1.0) are fully supported. There is no plan to deprecate fee-0.7. Registrars may continue using fee-0.7 or transition to fee-1.0 at their own pace.
Technical Implementation
When a registrar declares both fee-0.7 and fee-1.0 extensions on login, Tucows Registry Services implements an intelligent per-request matching solution:
- Request with fee extension → The server responds with the same fee extension version used in the request
- Request without fee extension but response needs fee data → The server uses the highest declared version from the session (fee-1.0 takes precedence over fee-0.7)
Testing in OT&E
Radix OT&E at Tucows Registry Services is now available for comprehensive testing of fee-1.0 functionality. We encourage all registrars to:
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Validate fee-1.0 extension behavior in your testing environment
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Verify compatibility with existing fee-0.7 implementations
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Test the per-request extension matching solution
Production Availability
fee-1.0 and fee-0.7 support will be available in Radix Production on transition day (March 17, 2026).
Support and Questions
For additional information and guidance regarding the Radix TLDs transition to Tucows Registry Services, we encourage you to review the Knowledge Base resources available at: https://tucowsregistry.com/radix.
If you require assistance with fee extension support, technical testing guidance, or transition-related questions, please reach out to Tucows Registry Services Technical Support at trs-support@tucows.com.
For transition-related queries specific to Radix, please reach out to transition@radix.email.
Sincerely,
Tucows Registry Services
