Prediction Market to Sports Odds Converter
Extension Actions
CRX ID
clpgallnkfmpjoaodbbpjfjfknghojoa
Description from extension meta
Append sportsbook-style odds next to prediction market prices (Decimal, American, Fractional) with optional fee adjustment.
Image from store
Description from store
Chrome extension that appends sportsbook-style odds next to prediction market prices on Polymarket and Kalshi. Shows Decimal, American, and Fractional. Optional fee adjustment (in percentage points) to model effective probability before conversion.
- Finds text like `55%` or `$0.55` and computes:
- Decimal: 1 / p
- American: if p >= 0.5 → -(p/(1-p))*100, else ((1-p)/p)*100
- Fractional: (1 - p) / p as a simplified fraction (approx.)
- Works on SPA updates using a `MutationObserver`.
- Avoids duplicate badges via a data-attribute.