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.
Thanks for your suggestions! Spamming loses the spammer money and time, and in case such thing is detected it's possible to force our outgoing tips to be hidden for that user, or prevent them from exchanging and refund the coins few hours later. If they still continue abusing, it's possible to hold the coins and show them an alert and that they should contact support to get a refund, and let them know further tips would not be refunded or exchanged, etc.
These are solutions from our end, it's also possible that Stake chat mods would pick up on this tip spamming and restrict their tipping ability. Since Stake's aware of the bot it shouldn't cause issues for the bot account.
