Six surfaces. One operating picture. Built for the seller who ships fifty orders before lunch.
From a name on a card to a ready listing in seconds.
Type a player, paste a list, or bulk-add by ID. C3I comes back with the card identified, priced against live comps, and ready to list — as a single or built into a lot.
- Search · live comps
- Bulk add by ID
- Singles or auto-lots
It tells you what to price, grade, and relist.
Live pricing recommendations from real market comps. Grade-profit math against graded sales. Stale listing detection and market drift alerts.
- Live pricing
- Grade-profit math
- Drift alerts
Sell in two places without ever double-selling.
Lists straight to eBay — no CSV uploads — and cross-lists to Shopify automatically. When a card sells on either channel, it comes down on the other within minutes.
- Straight to eBay
- Shopify cross-list
- Sold = down everywhere
One inbox. Disputes visible. Refunds in one click.
Every buyer message in one inbox, answered without opening eBay. "Item not received" cases surface before they escalate. Message every buyer of a delayed release in a single send.
- Unified inbox
- Dispute queue
- One-click refund
Every order picked, packed, and labeled in one pass.
Pick lists sorted the way your cards are actually stored. Branded packing slips. Label rates compared across carriers so each package ships at the best price.
- Location-sorted picks
- Branded slips
- Best-rate labels
Every listing looks professional — without touching HTML.
Branded description templates, search-tuned titles, and item specifics filled in automatically. Buyers see a polished storefront; you never format a listing by hand.
- Template library
- Search-tuned titles
- Auto specifics
Questions, answered.
Plain answers from operators, not marketing copy.
01What is C3I?+
An operations platform for card sellers. Listing tools make sellers list faster — C3I makes them operate smarter. Pricing intelligence, grade-profit math, stale detection and channel sync are first-class, not add-ons, and the workflow runs end to end: intake, pricing, publishing, orders, shipping label.
02Where does the pricing data come from?+
Live market comps power every recommendation — pricing, grade-profit math, drift alerts. The data layer is integration-agnostic and will continue to expand as new sources come online.
03Who runs C3-DO?+
C3-DO is a Dayton, OH collectibles retail business operated by a Navy veteran. C3I is the in-house operations platform — built by an operator, for operators, and running C3-DO's live storefronts today.
04When can I get in?+
C3I is in production use at C3-DO today, and we're enlisting a founding cohort of operators ahead of public launch. Request access and we'll reach out as seats open — founding operators get a guided import of their existing inventory.
Stop running your business out of tabs.
C3I is enlisting founding operators ahead of launch. Bring your eBay account; we'll bring everything else.
You're on the list. We review every request and follow up within 48 hours.