Sitra: Spend anywhere. Reveal nothing.

Hey Product Hunt 👋 I'm the solo founder behind Sitra. This started from something small and annoying: I signed up for a free trial, forgot to cancel it, and got charged for four months before I noticed. Not a huge deal financially,but it bugged me. I gave a company my real card number for a $0 trial, and I had zero control over what happened next. I started paying attention, and the pattern was everywhere. Every site I bought from once, a random SaaS tool, a one-time purchase, a trial I wasn't sure about, got the same card as my rent and my groceries. If any one of those got breached, I'd find out the same way I always do: a weird charge, a call to the bank, a new card, and an afternoon updating it everywhere. The obvious fix is also the simplest one: don't give the same card to everyone. Give each purchase its own card, and let it expire when you're done with it. That's all Sitra is right now. Generate a card. Set a limit. Set an expiry. Use it once. It deletes itself. Nothing clever, nothing hidden, just a card that doesn't stick around longer than it needs to. Sitra is currently in development, but before investing months into building the platform, I want to make sure I'm solving a problem that genuinely matters. This waitlist is my way of learning from early adopters, validating demand, and building the right product, not just building fast. A few things I'd genuinely love your take on: 1. Where does this bite you the hardest — subscriptions, free trials, one-off purchases, something else? 2. Would you actually want a new card for every merchant, or is that overkill? 3. What would make you trust a virtual card provider you'd never heard of? I'll be in the comments all day. Tell me if this is useful, tell me if it's not, both help.