As of right now the only way is either by checking payment history and seeing if I refund every payment with the "Low voting power" message, or by sending me a payment and seeing if it is upvoted or refunded.
In the future I will add features so you can easily tell, but as of right now I am prioritising ironing out bugs, I'd rather have a featureless bot that is guaranteed to work rather than a bot full of features and full of bugs and problems!