Explore revenue models to fund minor expenses

I am incurring a personal monetary cost for hosting this API at the moment.

Ideally I don't want to incur any cost for this unless we are generating some form of revenue to sustain it.

Donations are an option but not recurring (at least from the common practices of donations).

Maybe we could integrate Adsense into this to offset the cost by displaying banner ads?

The revenue would strictly be used to power the scale and server costs or any other 3rd party API integrations in the future.