It would be extremely useful to have an accessible API to use PTable data remotely for programs like calculators.
I personally have a calculator for finding specific data of specific elements and it would be extremely useful to already have an existing set of data to use rather than manually implementing everything by myself.
I think this is better handled by libraries dedicated to data. I'm already a secondary source. I shouldn't also be providing data.
I suggest something like this: https://github.com/andrejewski/periodic-table