
Technology
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Consumer Marketplace
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YC W26
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Valuation:
Undisclosed

Last Updated:
March 24, 2026

iOS and web platform that lets collectors create custom mystery packs with personalized odds, cryptographically trusted tooling, digital pack openings with optional physical card fulfillment, and a $1 marketplace with instant payouts via Venmo and PayPal.
Custom mystery pack creation with personalized chase odds. Cryptographic randomness proofs with open-sourced card selection code. Digital pack openings. $1 marketplace. Instant buyout offers with Venmo/PayPal payouts. Free shipping on cards. Vault storage. Launching joint collaboration with Steph Curry's trading card company. 700 users, $13K MRR.
iOS-first with web secondary. No Android app yet. Targeting the $20B+ annual trading card market growing 10-15% YoY. Differentiated by combining cryptographic trust with physical fulfillment and frictionless payouts. Community demand for more card types beyond Pokemon and sports.
A machine-learning model dynamically assembles mystery packs by optimizing card allocation against creator-defined odds while a cryptographic commitment scheme lets buyers independently verify that every pull was fair.
It's like a slot machine that publishes its own math homework so you can check it never cheated.
It's like a magician doing a card trick, except the audience gets to watch the security-camera footage afterward and confirm nothing was up the sleeve.
A computer-vision pipeline analyzes user-uploaded card photos to authenticate cards against a reference database and assign a preliminary condition grade, reducing fraud and enabling confident instant buyout pricing.
Your phone's camera becomes a tiny card-grading expert that spots fakes and surface scratches before money changes hands.
It's like having a jeweler with a loupe inspect every card at the speed of a barcode scanner.
A recommendation engine analyzes buyer behavior, market comps, and creator inventory to surface the highest-affinity packs per user while a dynamic pricing model adjusts pack prices in real time to maximize sell-through and creator revenue.
The app figures out which mystery packs you'll love most and prices them just right so creators sell out and buyers feel like they got a deal.
It's like a flea-market vendor who somehow already knows you collect '90s basketball rookies and adjusts the sticker price right as you walk up to the table.
Joseph Zhang was previously an early engineer at a crypto startup building a DEX and NFT launch platform, former consultant at McKinsey working on AI transformation projects, and software engineer at AWS on cloud storage infrastructure. Sophia Kim brings Web3 platform expertise for collectibles liquidity. Deep personal experience buying, selling, and comping cards across eBay, Whatnot, and Instagram DMs informed the product design.