Vintage reseller uses Claude for listing drafts and sales exports across six platforms, but writes buyer messages by hand

What they did

They have a Claude project just for listings: they give it the product name, era, condition, hallmarks and dimensions, then edit the draft and tailor it to each platform. They built a tool that pulls cost, date and item count from invoices and receipts into their P&L tracker, and a dashboard that reads each platform's sales exports (a CSV from eBay, a PDF from Poshmark) and works out gross sales, fees, net, COGS and margin. A batch tool edits product photos to each platform's requirements. They also use Claude to research unfamiliar categories, check comparable prices and think through bigger decisions.

How it went

They say Claude brought up cubic pricing, which they used to bring shipping costs down. Listing is far less tedious than starting from a blank page.

Worth knowing

• They write every buyer message themselves, because buyers can tell an expert from a bot and response time affects platform rankings. Condition calls, sourcing, staging photos and pricing above comps stay with them; AI can give comps but can't judge rarity or a trend.
• Price check: Claude: free plan; Pro: US$20/month, or US$17/month on a yearly plan (US$200/year) (checked Nov 1, 2026).

Paying for Claude? See cheaper Claude alternatives.

Try it yourself

Paste this into a chatbot, then add your own details underneath.

Draft a listing for this vintage item: [name, era, condition, hallmarks, dimensions]. Give a title under 80 characters, a description that states the condition honestly, and 10 search tags. Then show what to change for eBay versus Etsy. Don't add any details I didn't give you.

Original post

See Yvonne Cheng (Bored Biddy)'s original post on Substack → (May 13, 2026)