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 World's Strongest Warriors (OP17) — and turns that data into clear, actionable signals. Updated daily.
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 OP17 The World's Strongest Warriors, all extra boosters (EB01–EB03), The Best reprint sets (PRB01/PRB02), every starter deck from ST01 to ST30, 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.
Latest market analysis
All articles →Hot Deals, Four Months Later: Does a Long Streak on the List Mean a Better Buy?
4,702 hypothetical purchases from the daily Top 50. The list beat the rest of the market by 15 points in 30 days, but how long a card had been on it predicted nothing. What it had already done on the list did.
13 min readThe One Piece TCG Market in September 2026 — Monthly Report
The index fell −6.4% in September, but the typical card fell −2.9%. OP16 stopped falling, OP17 singles slid 11% after launch week, and last month's biggest "gainers" turned out to be August's dips coming back.
13 min readWhich Rarities Let You Sleep at Night? Volatility, Drawdowns and Growth by Tier
Five months of daily prices across 914 cards. SPs almost never drop 30% overnight and every drop recovered; SECs drop twice as often and stay down. What each rarity tier costs you in sleep.
14 min read
Frequently asked questions
How do I check the price of a One Piece card?
Search the card name or number (for example "OP05-119") on OPMT. Each version of a card (base, Alt Art, SP, Manga…) has its own page with the cheapest current CardMarket listing, 7- and 30-day averages, the price trend and the TCGplayer (US) price. Prices update daily.
What are the most valuable One Piece TCG cards?
The most valuable cards are almost always the rarest printings: Manga rares, SSPs, SPs and Treasure Rares, which can take hundreds or thousands of booster packs to pull. OPMT's set pages list the 25 most valuable cards of every set, from OP01 Romance Dawn to the newest release, at live prices.
Why do cards with the same number have such different prices?
One card number is printed in several versions — a base print, an Alternate Art, and in some sets an SP, Manga or Treasure Rare version. They share the number but differ enormously in pull rate, so a base card can cost €1 while its Manga version costs thousands. OPMT tracks every version separately.
Is OPMT free?
Yes, the core is free: every card page with its current price, the set pages, the guide, the market analysis blog and portfolio tracking. Premium unlocks full browsing with investment scores, deal lists, sell signals and custom scoring formulas.
Where does OPMT get its price data?
From CardMarket, Europe's largest trading card marketplace, synced daily: current listings, offer books and detected sales. TCGplayer prices are added for US comparison. Pull rates for special versions are researched by hand.
What is the OPMT LT score?
The long-term (LT) score rates a card from 0 to 100 on factors that have historically supported prices: character popularity, pull rate, sales velocity, how quickly the market can absorb supply, price resilience, rarity, the US–EU price gap, value relative to similar cards, set age and price band. The full formula is documented in the OPMT guide.
Is OPMT financial advice?
No. OPMT provides market data and algorithmic scores for information only. Card prices are volatile — always do your own research.
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.