nostr:npub1j9k220uxarsuc7fj9kp2cs9yahetqy4q6m9cdatn5srkwk6mr6tqcy7e8k. It's in testing right now so you have to message nostr:npub15ypxpg429uyjmp0zczuza902chuvvr4pn35wfzv8rx6cej4z8clq6jmpcx and ask him to get whitelisted to use it. Pay him a decent zap for his work. That part's not a requirement, just a suggestion. V4V, right?
You DM the bot with "fees [number]" and it will DM you when fees drop below the number you specify.