There are many altcoins today, is there any way I can exchange them for free. Changelly charges a lot, other exchange services too. Most of the excahgnes do not have the token I want.
Any service that provides the same?
If you want to exchange those altcoins of yours, you must make sure that it is already listed on crypto echange/s, in order for you to trade it with other altcoins or major coins. If it is not listed, you can still trade it in some decentralized exchange/s using contract address if it is ERC20 support tokens.