Once UI Stack's storefront now runs on a real Fourthwall or Shopify catalog, with low-stock and sale prices, a free-delivery cart, drop alerts by email and product SEO.
The store in Once UI Stack is now a real shop. Point it at a Fourthwall or Shopify catalog and the products, the cart and the checkout come from there, while the storefront stays on your own site, in your own design.
Fourthwall or Shopify, one setting
Fourthwall suits creators selling merch: it makes the products and handles payments, tax, shipping and fulfilment. Shopify suits a shop of your own. Either way the store reads its catalog and cart from the shop's Storefront API and sends the customer to that shop's checkout.
# Fourthwall
FOURTHWALL_STOREFRONT_TOKEN=…
# or Shopify
SHOPIFY_STORE_DOMAIN=your-shop.myshopify.com
With neither set, the catalog is read from files in the project, so the store still builds and runs with no keys at all.
Low stock and sale prices
Sale prices, low stock and sold-out products come straight from the shop. A product with only a few left says so under the button, and the phone layout keeps the buy button in reach.
A cart that counts to free delivery
The cart opens in a drawer beside the page and shows how much is left until free delivery, so the next item is one tap away.
Drop alerts by email
When a product is sold out, the page asks for an email instead of showing a dead button. Signups go to an Aveiro newsletter, so one email reaches everyone when the next drop lands.
Found in search
Every product page carries structured product data, and the store has its own sitemap, so search engines can show products with their price and stock.
Stack is the Once UI app starter: auth, billing, teams and surfaces like this store, built for AI agents to extend.
