{"api_version":"v1","app":"Properties Library","cantera_available":true,"cantera_version":"3.2.0","chemicals_available":true,"chemicals_version":"1.5.2","common_fluid_count":351,"coolprop_available":true,"coolprop_error":"","library_edition":"public","library_edition_locked":true,"library_version":"1.0.2","material_count":1654,"material_standard_count":0,"ok":true,"pint_available":true,"pint_error":"","pint_version":"0.26.2","thermo_available":true,"thermo_version":"0.6.1","unit_contract":{"api_rule":"Every converted API value keeps raw SI metadata plus display metadata.","internal_fluid_properties":"SI base/derived units per property raw metadata.","internal_fluid_state":{"pressure":{"dimension":"pressure","unit":"Pa"},"temperature":{"dimension":"temperature","unit":"K"}},"internal_material_properties":"SI engineering units stored in data records.","unit_engine":"Pint-backed allowlist at API/UI boundaries; internal calculations remain SI floats."}}