Launching today

PUPMKT

Launching today

Evidence-first resale for games, cards and collectibles

1 follower

Evidence-first resale for games, cards and collectibles

1 follower

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Hi Product Hunt, I am Stephen, founder of PUPMKT. On most resale sites a listing is a story the seller tells. Here it has to carry evidence: photos of the exact item, its identifiers, its condition, one listing per physical thing. Browsing is open, sellers open today, purchases follow. Built in six months with GPT-6 Astra, Codex and Claude under a signed verification chain, every product decision mine. Tell me where the evidence rules feel like friction and where they feel like trust.

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Launch tags:Artificial Intelligence•E-Commerce•Shopping

Launch Team / Built With

OpenAI

GPT-6 Astra Challenge

What became possible in your product with Astra that was not practical before?

Maker

Astra made it practical for me, as a solo founder, to develop and review a bounded feature inside a large, governed marketplace codebase, not just generate a prototype. For PUPMKT’s Listing Evidence Assistant, that meant working through existing architecture, provider configuration, refusal behavior, feature gates and tests while preserving the repository’s 44-step verification chain. It also helped review public-facing policies against what the deployed product actually did, identifying contradictions that a simple copy review would miss. The biggest change was the amount of implementation and cross-checking I could undertake with limited resources. I still made the product and release decisions. Astra helped me turn those decisions into changes I could inspect, test and refine.

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5h ago

Maker

📌

Hi Product Hunt 👋 I’m Stephen, founder of PUPMKT. I built PUPMKT to make it easier to understand what you’re buying secondhand. Listings bring together photos of the actual item, relevant identifiers, condition details and disclosed defects- with one listing per physical item. Browsing is open, seller onboarding opens today, and purchases will follow. This represents six months of development, built primarily with Codex, with Astra and Claude contributing later. AI handled much of the coding; I directed the product decisions, with changes going through a signed verification process. I’d love feedback from both sides: Buyers: What evidence would help you feel comfortable buying from an unfamiliar seller? Sellers: Which requirements would be useful, and which would make you abandon a listing?

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8h ago