Swarms
Group-buy aggregation with a live commit window. Buyers see the price falling as their teammates join — past the quantity floor that came with the product. Cards are saved at commit (SetupIntent) and charged at the bottom-of-curve unit price when the swarm closes.
- Magic-link sign-in — no buyer accounts to manage
- Buyer-protection invariant: never pay more than committed
- Sticky activation: once minimums hit, the swarm doesn't bounce back
- Charge-at-close via Stripe; idempotency guards every transition