In this case "basic algorithm" means writing a whole crypto exchange. Needless to say, this is infeasible. And even if you will write some small, very limited exchange, no one will use it, because it would be untrusted, feature only one or a few pairs and generally have poor experience. There's zero reason for users to choose your exchange over a real exchange.

In the early days of ICO, when there was no Ethereum tokens, ICO teams used to make some simple sites for buying their coins, so if you're making a full coin with its own blockchain, this can be an option, but it won't be a market.