One full MLB game (Arizona Diamondbacks @ Minnesota Twins, 2026-06-21), with Polymarket and
Kalshi prices aligned tick-for-tick and the settled outcome labeled on every row.
This is a single-game sample of a larger archive. The point it proves: across the whole game, both
venues priced the Twins' win probability within ~1¢ of each other on average — climbing together
from ~0.10 to ~0.99 as Minnesota (the eventual winner) pulled away.… See the full description on the dataset page:
https://huggingface.co/datasets/Coyevans/mlb-polymarket-kalshi-matched-book-sample.
