I'm a dev, I wrote the damn import already twice and would do it a third time yet won't pay 90€ just to hold my data. My requirements are web/mobile/api access

I'm a dev, I wrote the damn import already twice and would do it a third time yet won't pay 90€ just to hold my data. My requirements are web/mobile/api access plus monthly budgeting. Does such service exist in the FOSS world?