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Underpriced AI

Photograph an item to see what it really sold for on eBay, then list it in a tap

Visit underpricedai.comVerifiedas of Oct 31, 2026

What it is

Underpriced AI is a pricing and listing tool for resellers: photograph an item, see what it actually sold for from real eBay sold listings, then list it to eBay or Bonanza and fill Poshmark, Mercari and Facebook listings. Founder Frank Kratzer says he built it with Claude Code using only prompt engineering, originally for his wife, on Next.js, Postgres and the Claude API with Capacitor mobile apps.

How it was built with AI

Per the founder on Indie Hackers: "I have the documentation how this was built using Claude Code, only using prompt engineering. It was originally built for my wife from the ground up"

Traction

Verified

$5,117 in revenue in the last 30 days, Stripe-verified on Indie Hackers

As of Oct 31, 2026. Read from a payment provider via a public third-party profile such as TrustMRR. Read the source

One of 50 vibe-coded apps on MissumAI with revenue backed by payment data or a shown dashboard. See all vibe-coded apps making money

Sources

  1. 01Underpriced AI revenue on Indie HackersIndie Hackers · checked Oct 31, 2026
  2. 02I built an AI tool that turns photos into eBay/Etsy listings in secondsIndie Hackers (Frank Kratzer) · Dec 31, 2025 · checked Oct 31, 2026

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