ListLift: AI Etsy listing writer Chrome extension

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A Chrome extension (Manifest V3) that writes Etsy listings. On an Etsy listing page, one click turns a product photo and a few keywords into an SEO title, all 13 tags and a description. It is set up as a $9/month subscription, with a serverless proxy so the AI key never ships inside the extension.WHAT YOU GET- MV3 extension: an inline button and panel on Etsy listing-editor pages, a popup generator, usage metering and a paywall (3 free listings a month)- Cloudflare Worker proxy that holds the model key and calls Claude Haiku. Photos are downscaled and EXIF-stripped before upload- Payments: Upgrade buttons open a Stripe Payment Link carrying the install ID. A signed-webhook endpoint on the Worker (HMAC-checked Stripe-Signature) grants paid status in KV and revokes it on cancellation. An optional ExtensionPay adapter is included- 14 passing Worker tests (quota, monthly reset, paywall, webhook valid/invalid/tampered/expired, revocation) with mocked fetch and KV- Icons (16/32/48/128), a 128 px store icon and a 440x280 promo tile, drawn by an included Pillow script- Privacy and terms pages, README with setup and Chrome Web Store steps, and a 23-second walkthrough videoTECHVanilla JavaScript (no npm packages, no build step), Chrome MV3, a Cloudflare Worker with KV (free tier is enough) and the Anthropic API on the buyer's own key.WHY IT IS WORTH BUYINGEtsy sellers already pay for tools like eRank and Marmalead, and writing listings is a daily chore. The architecture is subscription-ready, and AI cost per listing should be small next to a $9 price (not yet measured).TO LAUNCHDeploy the Worker and add your Anthropic key as a secret, set the proxy URL, create your Stripe account, Payment Link and webhook, run a Stripe test-mode purchase, check the selectors on the current Etsy editor, then publish to the Chrome Web Store.TRANSFER- Source zip and git bundle (fresh repo) with SHA-256 checksums- Handover guide and due-diligence report- 30 minutes of email handover. Payment through Escrow.com- No domain, accounts, store listing or revenue history includedHONEST DISCLOSURES- The code was previously public at github.com/suncal/listlift under the MIT licence (since 7 Oct 2026), including a packaged extension zip. Copies made under that licence cannot be revoked.- Never published on the Chrome Web Store and has no users or revenue. Icons and the Stripe-webhook flow are built and unit-tested with mocks only; they have never run against live or test-mode Stripe.- The 'Fill Etsy fields' feature has not been verified on the live Etsy editor. Tags are copied to the clipboard, not auto-filled.- The free quota is enforced server-side per install, but reinstalling gives a new free quota (limited by a per-IP daily cap).- Other products named 'ListLift' exist, including an Etsy listing tool and a Chrome extension, so a rename is recommended. The extension name also contains 'Etsy', which may need changing for store and trademark rules.- The walkthrough video uses a mocked AI proxy and an AI-generated product photo. No real Anthropic call has been made, and per-listing AI cost has not been measured.