Is real estate transaction data publicly available?

Want to pull data from somewhere and train a model, you guessed it, for price and offer prediction. It has to be fresh data. Real estate companies do show their listings and transactions in a nice way like Redfin, does MLS have paid API tier to get the listings, or they have back channels to sync the data?

api companies data datascience mls nice prediction price real estate redfin show train transaction data transactions