ChopArm turns live prices and eBay supply into buy, watch, and trim signals for sealed boxes and singles across four games — each one explained in plain English, so you know the why, not just the score.
A 0–10 buy / watch score on every sealed box, from price trend, supply, and set-value.
Buy, watch, and trim signals on 1,800+ singles — Pokemon, One Piece, Lorcana, Riftbound.
eBay supply tracking and projected price cones with a published forecast track record.
Every signal comes with a short story of what's driving it — not just a number.
Put two products side by side and see which the data actually favors.
Every signal's outcome published — the whole ledger, not a highlight reel.
Live market prices and eBay listing counts, refreshed daily for singles and twice a week for sealed.
Price trend, supply, and set-value combine into a 0–10 buy, watch, or trim.
Read the story behind the score, check the forecast, and make the call yourself.
No cherry-picked hit rate. Every signal we've ever fired is scored against what the price actually did next — wins and misses.
Open the dashboard — it's free, no signup — or drop your email above for Pro alerts when they land.
Launch the dashboard →No. ChopArm is an informational tool that tracks quantitative price and supply signals from public marketplace data. Nothing here is financial, investment, or trading advice. Past signal performance does not guarantee future results — always do your own research.
Yes. Sealed and singles signals, track record, compare, and search are free with no account, and a free account adds your own watchlist. Pro is coming later: alerts when something on your watchlist changes, every single worth $10+ from every era, and forecast price bands. Join the waitlist to hear first.
Sealed boxes, ETBs, and about 1,800 singles across Pokemon, One Piece, Lorcana, and Riftbound. Singles prices refresh daily; sealed prices and eBay supply twice a week.
Live market prices and eBay active-listing supply. Signals combine price trend, supply contraction, and set-value into a transparent 0–10 score, with the reasoning shown in plain English.