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The Bonus Power Index (BPI) rankings system is bonus.com’s proprietary rating system for sweepstakes casinos. No amount of affiliate money can influence these rankings. They are based entirely around 6 core, quantifiable metrics that are weighted on the basis of how much they impact the user. Popularity (derived via total monthly search volume figures) (20%) One of the most unique features of the BPI is its use of a logarithmic curve to calculate star ratings (1–5). This prevents a single massive outlier (like a casino offering a billion Gold Coins) from making every other competitor look like a 1-star platform.

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