About Hobby Card Index

Who built it, why we built it, where the data comes from, and how we keep it honest. Plain-language version, no marketing wrapper.

Maintained by Hobby Card Index · Last updated May 7, 2026

What HCI is, in one paragraph

HobbyCardIndex is a full-stack hobby intelligence platform, pricing, scanning, dealer-side tools, and market research, all running off one catalog. The catalog covers roughly four million cards across more than forty categories, with six distinct data feeds behind it. Sports cards, trading card games, hobby-adjacent collectibles. Founded in 2025, independently owned, not a grader, not a marketplace, not a breaker, not a manufacturer. The full structural commitments are on the independence page. This page is for the people behind it, the methodology, and the why.

Who built this

HCI was built by collectors. Not by a SaaS company that decided to bolt a hobby skin onto a generic data product, and not by an outfit that figured out card pricing the week before they launched. The work behind HCI, the catalog architecture, the sold-price ingest pipeline, the grading-ROI math, the dealer-side inventory and consignment tools, comes out of decades inside the hobby. Pokemon, Magic, and Yu-Gi-Oh on the TCG side. Modern Bowman and prospect 1st autos on the baseball side. Prizm, Optic, National Treasures, Mosaic, and RPAs across modern football and basketball. T206-era vintage and pre-1980 baseball at the other end of the timeline. We’ve held the cards we’re tracking. We’ve sat at the show tables. We’ve shipped through consignment and watched what happened on the resale side. The platform is built on top of that, not separate from it.

Sean runs HCI. Lifelong collector since childhood, card-show vendor going back further than most platforms have existed, consignment and dealer-network experience on the wholesale side. The “we” used across this site is deliberate, HCI is a real platform with real operating partners on the build side, and the work is too big for an “I.” The point isn’t who’s at the keyboard on a given afternoon. The point is that the people behind HCI live inside the hobby, not adjacent to it.

Why this exists

The hobby has had pricing tools for a long time. What it hasn’t had is a tool built around how serious collectors and dealers actually work. Inventory aging, consignment tracking, listing helpers, tax export, batch scanning, real grading-ROI math, the dealer-side tooling in this hobby has been stuck in the 1990s for two decades. Most of the “modern” pricing platforms still treat dealers as an afterthought, with a thin marketplace integration bolted onto a consumer-facing price guide. That gap is where HCI started. Build a working tool for the people who actually move volume, then build outward from there into the lookups, the watchlists, the market intelligence dashboards, and the public reports. The collector-side product is good because the dealer-side product had to be.

The neutral-data discipline came at the same time. HCI publishes what the data actually says, not what we’d like it to say, not what a partner would prefer it said, not what gets the most engagement on hobby Twitter. Methodology lives on the methodology section below. Read it, argue with it, point out where the math could be tighter. We’d rather get corrected on a number than have the report reread later as marketing.

How the data is sourced

This is the methodology section. If you're a journalist, an analyst, or a collector trying to vet the numbers, this is the part that matters.

Primary pricing feed

Current card valuations on HCI come from real sold prices aggregated across the hobby. This sold-price feed is our single source of record for "what's a card worth right now." We ingest it nightly. Every price you see on the platform, market movers, the heatmap, category pricing, the 7th-grade price grid, the live ticker, portfolio value, grading-ROI estimates, flows from that one ingest. The reason we narrowed to a single feed for current price is the same reason a journalist names one source per fact: when something looks wrong, we need to know exactly where to look.

Historical and secondary data

For historical sales context, "what did this card actually trade for last August", we lean on eBay sold comps. We treat eBay as a historical record, not a current-pricing input. eBay sold data is valuable because it's the closest thing the hobby has to a public ledger, but the volume is uneven across cards and the listings need real cleanup before they're useful. So eBay sold prices live in their own surface on the site, separated from the sold-price valuation engine. We do not blend the two into a single price number.

Catalog and metadata

Card identity (sport, year, set, card number, parallel name, manufacturer, base print run where known) comes from a combination of internal cataloging work, public set checklists, and ongoing collector-reported corrections. If you spot a card or set that's wrong on HCI, the right move is to email [email protected] with the card and what's off. We log corrections by date and by card, and the catalog gets cleaner that way.

What we don't do

• We don't make up data. If a card has zero recent sold comps, we say so, we don't fabricate a "predicted" number to fill the cell.
• We don't sell user collection data. Your cards, your watchlist, your prices paid are yours. Aggregate market signals get used internally to improve our indices. Nothing user-level goes to grading services, marketplaces, or third parties.
• We don't pay for placement. Nobody buys their way to the top of a "movers" list, a heatmap cell, or a comparison page. Rankings reflect the data, full stop.

Our principles, the short list

1. Independent ownership. No grading service, no marketplace, no breaker, no manufacturer. The structural detail lives on the independence page.
2. Single source of truth per data type. Current price comes from our real sold-price feed. Historical sales come from eBay. Catalog comes from a combination of cataloging work and collector corrections. Each source is named. Each is auditable.
3. Free tier means free. Basic price lookups, watchlist, collection tracking, market-intel dashboards, not gated. No credit card. No upsell wall. Paid tiers exist for heavier dealer-side work, but the basic price tools are open.
4. Methodology in public. If we change how we calculate something material, market temperature index, mover scoring, ROI math, we version it and document the change. The methodology page exists so a reader can argue with the math, not just the conclusion.
5. Corrections welcome, in writing. We log every correction we ship by date. Catch us being wrong, on a card, a set, a sale, a number, and we'd rather you tell us than work around it.

What HCI actually does

The product side of the platform breaks down roughly like this. None of it is the kind of thing you have to take on faith, everything below is live in the app today.

• Card lookup & price history. Find any of the ~4M cards in the catalog, see current value (sold-price feed), historical sold comps (eBay), grade ladder, and recent print-run / population context where available.
• Collection & portfolio tracking. Track what you own, what you paid, what it's worth now, and what your full portfolio is doing month over month. Free tier supports a modest collection size; paid tiers scale up.
• Watchlist & alerts. Mark cards you're hunting. Get notified when a sold comp lands inside a price range you set.
• Market intelligence dashboard. Movers, the category heatmap, the 7th-grade pricing grid, and the live tracker, all running off the same sold-price feed. The dashboard is meant to surface what changed in the last 24 hours, not just what's expensive.
• Grading ROI scanner. Given a raw card and a target grade, estimate the realistic premium versus submission cost. Estimates only, we don't claim grade outcomes.
• Dealer-side tools. Inventory aging, consignment tracking, an eBay listing helper, and a tax export. Built for working resellers, not for hobbyists who don't need them.
• Research & reports. Long-form market studies (the K-shape work, the Panini-Topps license-flip tracking, periodic decade-by-decade pieces) published free on the site, no signup wall.

Where the project is

As of May 2026, every core surface is live. The sold-price pipeline runs nightly. The AI-assisted collection scanner identifies cards from photos against the four-million-card catalog. The dealer-side tools, inventory aging, consignment tracking, the eBay listing helper, tax export, batch scanning, all operate. The market-intelligence dashboard surfaces movers, the category heatmap, the live tracker, and the seventh-grade pricing grid off the same sold-price feed. Internal audits across backend, security, and frontend currently score in the 9.0–9.5 range, and the more notable results are published on the site, security and UI in particular. The roadmap is public. The platform ships forward, not sideways.

How to reach us

Email is the front door. [email protected] handles support, press inquiries, partnership questions, data corrections, and security disclosures. The full breakdown is on the contact page. We aim to read everything within one business day.