Is Arbitrage trading these days still profitable?
It is on small shitty exchanges on small shitty altcoins but you need to hold those coins (be exposed to currency risk) on both exchanges to be able to buy on one exchange and sell on another instantly without moving coins on chain. So you need to arbitrage coins that whales/professionals dont want to.
What I am also looking for arbitrage trading these days is when you use high volume trading pairs, you will get a low risk, low reward.
On high volume trading pairs on good exchanges spread is mostly lower than trading fees for average user. Whale bot arbitrage traders have 60-80% discount:
So you need 0.15% spread to break even (or more to cover wallets balancing fees - transfer from time to time) while whale is on 0.07% profit.
And forget about doing it manually. You need fast bot located on a server close to exchange servers to reduce latency.