Methodology
How we source, calculate, and — where we can — verify every number on RipIndex. No black box: here's exactly what each figure means.
Where the numbers come from
Every figure comes from public data — the odds each platform publishes, the pack-opens they record, and, for on-chain platforms, the blockchain itself. We don't take a platform's word for anything we can check independently. Data can lag or be incomplete, so we timestamp freshness on each machine and recommend verifying current odds on the platform before you act.
How we calculate EV
We measure a pack's value the way that's actually guaranteed to you: cost in, versus the buyback value of the card you pull. Each platform offers instant buyback — a standing offer to buy your pulled card back at a set percentage of its market value — so buyback is the one return you can realize with no resale, timing, or liquidity risk.
EV = the probability-weighted buyback value of the pull, divided by the pack price. We show it as an "edge" (EV minus 1). On every machine we track, that edge is negative — the house edge. Opening packs is negative-expected-value gambling; the math just says how negative.
How we verify — published vs. reality
Published odds are a promise. For on-chain platforms (such as Courtyard on Polygon and Collector Crypt on Solana), we can check whether that promise holds: we read the actual pulls off the blockchain and compare what really landed against what the platform advertised. That is our odds audit — "published X%, actually Y% over N pulls." Most odds trackers compute EV from published numbers and stop there. We check them. For off-chain platforms we can't read a chain, so we track the platform's own recorded pulls and are explicit about the difference.
VGEV — why an average EV can mislead
A pack can show a healthy-looking EV while a typical open returns pennies on the dollar, because the average is propped up by a rare "grail" that almost no one hits. So alongside EV we show:
- Typical open — the median result. Half of opens return less than this.
- Loss chance — the share of opens that come back worth less than the pack cost.
- Volatility — how wildly outcomes swing (Low / Med / High).
- VGEV (volatility-adjusted EV) — the EV docked in proportion to that swing (VGEV = EV minus one-half of the standard deviation of returns), so grail-lottery packs are penalized for the risk their headline EV hides.
Averages describe a crowd; these describe you.
Limits & honesty
- Small samples are noisy — early data on a machine can swing a lot; we flag low-volume reads.
- Published odds are not guarantees, and platforms can change them at any time.
- Past pulls don't change your odds. A machine "running hot" is recent variance, not a prediction.
- It's still gambling. Every machine is negative-EV long-run; none of this is a way to make money, and none of it is financial or gambling advice. Never spend money you can't afford to lose. US help: call or text 1-800-GAMBLER.