I hear that staking is taxed as income in the US. How do you keep track of staking rewards?

I just started staking Klima-dao. They give rewards 3 times a day. So I need to know the amount that I received 3 times a day, which I know already, and then at those times I need to know the fair market value because I'll be taxed on that value for my staking rewards.

Everything I see for historical data seems paid. Is there a way I can find this historical data without paying some silly amount of money for an api key? How do you guys do it?