Fee-true math, always
Every net figure includes marketplace fees, shipping both ways, and your actual tax situation. Resale cert? One toggle. No hopium numbers.
MARKET INTELLIGENCE FOR CARDBOARD
Buy retail.
Sell to the buylist.
Pocket the spread.
cardarb.io watches every retail price and every buylist bid, then does the fee-, shipping- and tax-true math your spreadsheet keeps lying to you about. If an arb shows up here, it survived a verification scrape first.
— retail history— buylists, 4×/day0 unverified arbs shown
Verified or it doesn’t exist
Two-stage detect → verify. We re-scrape the exact listing and the exact bid before an arb ever reaches your screen or your phone.
Deep tape
Daily retail closes back to Feb 2024 for every game. Buylist bids accrue 4×/day with write-on-change fidelity. Every chart says when its history starts.
Alerts that behave
Discord, email, push, in-app. Cooldowns, dedupe and a 30/hr storm cap so a flash crash doesn’t cook your phone at 3am.
Screens that print
Top movers, spread expansion, bids raised, cheap-NM-vs-market — saved presets over a metrics table built to sort 88k printings in under 50ms.
Mark your binder honestly
Positions marked two ways: conservative (best buylist cash) and mid (market). Know which of your P&L numbers is real and which is a bedtime story.
DAY-ONE DATA HONESTY
No fake depth. Every series tells you its birthday.
Retail history runs deep from day one. Buylist history is deep for MTG and accrues everywhere else — and the UI never lets you mistake accrual start for market genesis.
SERIESDEPTHHOW
01 · DETECT
Candidates, quietly
Metrics sweep flags spread candidates on market price — never condition-blind lows.
02 · VERIFY
Re-scrape before you see it
Listing depth, real condition, live bid, qty wanted. Dead scrapers get canaried, not trusted.
03 · LOCK FIRST
Price-lock, then buy
Lock the bid inside the vendor’s window, buy retail second, ship by the date. In that order.