Why We Built a Better MTGStocks — And How Our Prices Actually Work
If you've used MTGStocks to track card prices, you've probably noticed something off. A card you just bought for $15 shows up as $18 on MTGStocks. Or a card you're watching spikes 20% overnight — then "crashes" back down the next day. The prices feel volatile, inconsistent, and hard to trust.
That's not a bug in MTGStocks. It's a fundamental problem with how they source their prices.
The Problem: TCGPlayer "Average" Price
MTGStocks pulls TCGPlayer's "average" price — a simple mean of all active listings. This sounds reasonable until you think about what's actually listed on TCGPlayer at any given time:
- Damaged and heavily played copies listed at steep discounts
- Troll listings at $0.01 or $9,999.99
- Outlier prices from sellers who haven't updated their inventory in months
- Misgraded or mislabeled copies at prices that don't reflect the actual card condition
A single $0.50 damaged listing on a $15 card can drag the "average" down by a dollar or more. A seller listing a $5 card at $50 by mistake pushes it the other way. The result is a price that doesn't reflect what anyone is actually paying.
How SpellBook Prices Work: Transaction-Weighted Market Data
SpellBook Finance uses TCGPlayer's "market price" instead. This is a fundamentally different number:
- Calculated from actual completed sales, not listings
- Transaction-weighted — recent sales matter more than old ones
- Outlier transactions are statistically dampened
- Updated daily with real purchase data
The market price tells you what people are actually paying for a card right now. Not what someone hopes to sell it for. Not what a damaged copy is listed at. The real, transacted market value.
A Concrete Example
Take a Modern staple like Ragavan, Nimble Pilferer. On any given day, TCGPlayer might have 200+ listings ranging from $45 (heavily played) to $85 (sealed pack fresh). Throw in a few troll listings at $5 and $500, and the "average" bounces around unpredictably.
Meanwhile, the market price — based on the dozens of copies that actually sold today — sits steadily at $62. That's the number that matters if you're deciding whether to buy, sell, or hold.
Beyond Pricing: What MTGStocks Never Built
Accurate prices are the foundation, but SpellBook goes further with tools MTGStocks never offered:
- S&P 500 portfolio benchmarking — Is your collection actually beating the stock market? Add your cards and find out.
- Cross-market price comparison — See prices from TCGPlayer, Card Kingdom, CoolStuffInc, eBay, CardTrader, ManaPool, and 11 more sources side by side.
- Sealed product EV — Break down booster box expected value by rarity with live pricing.
- Price movers with real data — Daily movers based on market prices, filterable by format and price range.
Ready to Switch?
If you're tired of unreliable price data, see how SpellBook compares to MTGStocks feature by feature. The price data is free, and you can start tracking in seconds.