Version header
Use mymolecules-api-version: 2026-07-10 for the documented contract on Public APIs.
mymolecules-api-version: 2026-07-10Unknown versions
Unknown version values return 400 unsupported_api_version before the endpoint runs. This catches integration mistakes early.
Support window
Old public contracts are supported for at least 12 months. If a contract is deprecated later, customers receive at least 6 months of Sunset warning before removal.