Which altcoins are best for small payments in terms of transaction costs and speed?
when it comes to cheap transaction cost and faster transaction only 1 comes to mind DOGEcoin. it is very fast and cheap it is the only feature it has I guess :p and it is almost present in all the major exchanges.
other than dogecoin there are some other cheap coins too like xlm(stellar). you can use it as dogecoin is not available as of now in some new growing exchanges like binance.
I agree with you about Dogecoin. This coin is really very convenient for exchange because of fast transactions and small commissions. This coin can be bought in other places besides binance, for example in Bittrex, Poloniex, HitBTC, and YoBit.