BlockFi: To earn 4% interest on your bitcoin, your deposit must not exceed 0.25 BTC. The rate of interest takes a drastic downward dive if your deposit gets any bigger, so watch out for that.
Celsius: To earn 6.2% interest on your bitcoin, you must be a user from the USA and your deposit must be no greater than 1 BTC.
Midas: To earn 16% interest on your bitcoin, you must have 1250 MIDAS tokens (currently worth a whopping 0.06831250 BTC and rising) in your Lock-in.
Nexo: To earn 7% interest on your bitcoin, 10% of your portfolio must consist of NEXO tokens and you must opt to earn you interest in NEXO tokens.
YouHodler: To earn 4.8% interest on your bitcoin, deposit at least 0.1 BTC. Unfortunately, YouHodler is not available for users from the USA.