Know the One Piece card marketbefore everyone else
OPMT tracks prices, offer books and real sales for the entire One Piece TCG catalogue — from Romance Dawn (OP01) to The Time of Battle (OP16) — and turns that data into clear, actionable signals. Updated twice a day, every day.
A market intelligence platform, not just a price chart
Most trackers show you yesterday's price. OPMT watches the live offer book on CardMarket — Europe's largest trading card marketplace — for every One Piece card, detects actual sales as they happen, measures how fast supply is being absorbed, and compares European prices against the US market. All of that feeds three original scoring algorithms that rate every card from 0 to 100.
LT Score — Long-Term
Rates a card's long-term collectability from its pull rate (how many booster packs it takes to open one copy), character popularity, market scarcity, rarity type, set age and price relative to comparable cards. Recomputed nightly for the whole catalogue.
ST Score — Hot Deals
Walks the actual offer book to find supply squeezes before they happen: cards where only a handful of cheap copies stand between the current price and a 25–50% jump, and where sales velocity says those copies are actually selling.
MT Score — Medium-Term
Blends long-term fundamentals with short-term momentum and the 30-day price trend to surface cards that are both fundamentally strong and moving right now.
Complete catalogue coverage
Every booster set from OP01 Romance Dawn through OP16 The Time of Battle, all extra boosters (EB01–EB03), The Best reprint sets (PRB01/PRB02), every starter deck from ST01 to ST29, and promotional cards. For special rarities — Manga arts, SP cards, SSPs, Treasure Rares, Wanted Posters and alternate arts — we research and maintain pull rates by hand, because knowing that a card takes 2,500 packs to pull is the single most important fact about its long-term supply.
Tools for collectors and investors
Price history & live listings
Six months of daily price data per card, current cheapest listings, and a price increase calculator that estimates how many copies must sell before a card jumps 25% — based on the real offer book, not guesswork.
Sell signals
The reverse of hot deals: cards showing weakening velocity, growing supply or overheated prices relative to their rarity class — so you know when to take profit.
Portfolio tracking & alerts
Track your collection's value over time and get notified when a card you own or watch crosses a price or score threshold.
Market insights
Market-wide statistics: total market movement, set-by-set performance, and the biggest gainers and losers of the week.
US ↔ EU arbitrage
Every card's CardMarket price compared against TCGPlayer — when a card is 50% more expensive in the US, the European price usually follows.
Discord bot
Prices, scores and hot deals directly in your Discord server with commands like /card, /price and /hotdeals.
Built by collectors, with real methodology
OPMT is an independent project by One Piece TCG collectors and software engineers. The scoring formulas are documented openly in our guide — what goes into each score, at what weight, and why. Premium users can even customise the weights and build their own formula, then track its accuracy against the market over time. Read more about us or check the blog for weekly market analysis.
Disclaimer: OPMT provides market data and algorithmic scoring for informational purposes only. Nothing on this site is financial advice. Card prices are volatile — always do your own research.