Gradebay
Start grading ☰
Card-grading arbitrage operating system

Raw in. Gem out.

Gradebay scans every raw card worth grading, sets a disciplined max buy from live slab comps, and turns each submission into priced, listed, sold inventory — from one dark, fast console.

Start grading free See the console
6marketplaces, one radar
$96max buy, auto-calc'd
40%target margin, enforced
  Gradebay — grade desk / raw comp · '99 Base Holo #4
Grade-EV calculator
Weighted grade EV (comps)$420
Grading + return shipping+$28
Marketplace fees (13%)+$55
Target margin40%
Max raw buy
$96
● disciplined
One radar across the marketplaces you already scan
eBayCOMCTCGplayerWhatnot
The instruments

Three tools between a raw card and a graded flip.

Every Gradebay surface is built for buy discipline and fewer manual entries — calibrated for the collector staring at a listing with sixty seconds to decide.

01 — RADAR

Raw-card radar

Every raw card whose slab comps clear well above the raw ask, across eBay, COMC, TCGplayer, and Whatnot — filtered by set, sport or TCG, and price gap. Watch, don't refresh six tabs.

02 — GRADE DESK

Grade-EV calculator

From live PSA and CGC comps at each grade, the gem rate, grading fees, marketplace fees, and your target margin, Gradebay returns the exact max raw buy — so you never overpay for the raw.

03 — CARD LENS

AI card lens

Photograph the raw card. The lens returns the set, number, player, a centering and condition read, a predicted grade, and the slab comp — then drafts the eBay listing for you.

The console

Every card, priced to the dollar it made you.

Gradebay logs each submission's all-in cost — raw buy, grading, shipping, fees — and the grade that came back, then shows profit and ROI per card — no spreadsheet, no guessing which subs actually paid.

  • Card P&L and ROIRaw buy, grading, return shipping, and marketplace fees roll into one all-in cost, measured against the slab's final sale.
  • Inventory that stays honestEvery card carries its predicted grade, returned grade, ask price, and status — raw, submitted, slabbed, listed, or sold — so nothing gets lost in a box.
  • Publish where buyers arePush a finished listing to eBay and Whatnot, then track the sale, the fees, and the shipment from the same board.
Gradebay/console — submissions
RESALE REVENUE
$18.4k
ALL-IN SPEND
$7.3k
NET ROI
+152%
Slabbed cards
Silver Prizm RC · 2018 #280
all-in $210 · PSA 10
+148%
Holo Rookie · 2003 #128
all-in $84 · CGC 9.5
+176%
1st Ed Holo · Base #4
all-in $150 · PSA 9
+92%
Plans

Priced for the flip, not the seat.

Start free. Upgrade when the slabs start paying for themselves.

Scout

For your first few submissions.
$0/mo
  • Raw-card radar, 1 marketplace
  • Grade-EV calculator
  • Up to 5 tracked cards
  • Basic P&L
Start free
Most chosen

Grader

For collectors grading every week.
$39/mo
  • All six marketplaces
  • AI card lens & listing generator
  • Unlimited cards & submissions
  • eBay + Whatnot publishing
  • Sell-through analytics
Start grading

Operation

For dealers running bulk subs.
$129/mo
  • Everything in Grader
  • Multiple grader seats
  • Shared inventory & submissions
  • Priority support
Talk to us
6marketplaces, one feed
60sfrom photo to listing
152%median card ROI
$0overpays on discipline
Gradebay

Stop guessing on the raw. Buy the number.

The whole flip — radar, grade EV, lens, ledger, listing — in one operating system built for speed and buy discipline.

Start grading free