HN user
The ambiguity doesn't go away with specs, it just gets deferred to when the code is written and you discover nobody wanted the thing you specified. If AI can shrink the loop between 'I think this is a problem' and 'someone who has this problem told me it isn't' that's genuinely useful, that's the part that kills most early products not the building itself.
Congrats on launching, now the real work begins haha. The QR code thing is smart. Most yard sale apps try to handle payments directly and it always feels like overkill for a $3 GameCube game. Linking to whatever payment app the buyer already has is the right call. Letting people use it locally without an account first is a nice touch too.
Same thing hit us, $60k for three months with no warning either. It was infuriating. Been building a monitor to catch the warning signals early since then: https://stripehealth.earlyproof.io