Another thing that I suggest to the developer of the bot is to reduce the minimum accepted amount to Stake’s minimum accepted amount for the tip as many users may face some problems if they send tips that are below $0.50 in value.
Minimum amount is different for each coin so even if you can send, say $0.20, bot might not be able to send the converted amount back in another currency, that's why I set it at $0.50 to make sure, but I'll work on that as well, and add more currencies!
But the bot's purpose is to allow people to exchange coins through Stake, not necessarily tip other people. Don't you think setting the minimum amount way too low would increase the probability of spamming attacks even if you limit the request through the APIs? I don't see a problem even if you set the minimum exchange amount to $1, considering how many exchanges require at least $10 or $5. This sounds okay to me as an alternative way to trade your coins.