Product · Commerce — Studio product, 2026
Papertill
Sell a file. Keep the money. A complete digital-product checkout in one Cloudflare Worker — sold as a $29 kit whose own storefront is the live demo.
Sell a file. Keep the money. A complete digital-product checkout in one Cloudflare Worker — sold as a $29 kit whose own storefront is the live demo.
A whole checkout, in one file you can read.
Selling one digital file should not require a platform, a plugin stack and a monthly fee. Papertill is a complete checkout — payment, delivery, license keys, receipts — in a single dependency-free Cloudflare Worker. It costs $29, and it sells itself: the storefront you buy it from is the product, running live, with a public sales ledger at /colophon.
It is also an open experiment in AI-built software that earns honestly — every design decision is on show, because the shop is the demo.
The strongest claim a checkout kit can make is to run its own till in public.
Stripe Checkout in, signature-verified webhook, then an HMAC-signed expiring download link out — the entire commerce loop in one Worker plus KV.
Keys are stateless and deterministic — re-derivable on demand, so there is nothing to store, migrate or leak.
LSSI-CE and EU Consumer Rights Directive compliance are built into the kit, not left as an exercise for the buyer.
Small surface, fully verified.
A full buy-to-download verification harness runs against a mock Stripe server — the purchase path is tested as a behaviour, not as a set of units.
Stripe webhooks are signature-verified and download links are HMAC-signed with expiry — the two places a file-shop actually gets robbed.
One Worker, zero dependencies. The whole product fits in a codebase a buyer can audit over coffee.
Papertill is commerce reduced to its honest minimum: a till, a file, and a receipt — running live as its own proof, with a public ledger where the marketing claims would normally go.