The pricing page could use an example. I immediately had to use a calculator to get a sense of the pricing, missing a zero on the calculator is easy. Maybe "if you do 10.000 writes per day, so 300.000 a month, it's $45". Or a slider tool like https://sendgrid.com/pricing/

I think a minimum price could make sense. Chasing payments, e.g. expired credit cards, on accounts making $2/month won't be profitable.

Ages ago https://keen.io/ started like this. You can still see the 'stream', 'store', 'query', 'present' steps in their offer.