From the award levels, it looks like you don't pay for data per se, but you may be capped on the number of requests you can do per month, and maybe they offer i

From the award levels, it looks like you don't pay for data per se, but you may be capped on the number of requests you can do per month, and maybe they offer increasing that cap for money. See this comment for some info about the protocol: https://news.ycombinator.com/item?id=6644515 https://news.ycombinator.com/item?id=6644515