Warframe is a Free2Play game where it is actually Free2Play, you can proceed in this game without using real life currency. Everything that is available in this game can be achieved without paying with real life currency. Due the trading and playing, you can get items in this game which you can trade to other players for the currency "Platinum" so you don't have to pay with your own real life money or anything.

So there is no wall that will require you to pay with real life currency to proceed in this game.
Everything can be achieved by just playing this game and spending a lot of time in it.

Warframe is a Free2Play game where it is actually Free2Play, you can proceed in this game without using real life currency. Everything that is available in this game can be achieved without paying with real life currency. Due the trading and playing, you can get items in this game which you can trade to other players for the currency "Platinum" so you don't have to pay with your own real life money or anything. So there is no wall that will require you to pay with real life currency to proceed in this game. Everything can be achieved by just playing this game and spending a lot of time in it.