Answered November 1, 2026

Prediction Market Sports Prices History

The Odds Gap's files carry sports prices from Kalshi, Polymarket US, ProphetX and Novig in the same rows as the sportsbooks, with fees in. The odds history starts June 4, 2026, each exchange has its own first date on the coverage page, and the free week is September 15 to 21, 2026.

1. The book column names the exchange, so one filter gives you its prices.
2. A marks column on the archive says where an early price has a known limit.
3. Each exchange's first date is on the coverage page.

Coverage by Book The Data Page

import pandas as pd
df = pd.read_csv('https://theoddsgap.com/api/odds-export.csv?sport=all')
df[df.book.isin(['kalshi', 'polymarket_us', 'prophetx', 'novig'])].head()

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