Japan B LeaguePolymarket historical data and price history
Japan B League: a Polymarket sports series with markets recurring daily. Marketlens has captured 2 markets since October 22, 2026, of which 2 resolved, with $25.6K in traded volume. Every market's order book is captured as full depth L2 snapshots at regular intervals, alongside trades, candles, and the final resolution outcome.
For the sports archive as a whole, see Polymarket sports odds history.
Data as of 2026-10-26 · Polymarket series Japan B League · slug bkjpn
Resolution outcomes
Outcomes across 2 resolved markets with a recorded winning outcome. Settlement in the archive is by winning outcome, not by final traded price.
Markets in this series
Backtest this series
from datetime import datetime, timedelta, timezone
from marketlens import MarketLens, Strategy
class MyStrategy(Strategy):
def on_market_start(self, ctx, market, book):
ctx.buy_yes(size=10)
client = MarketLens()
end = datetime.now(timezone.utc) - timedelta(days=1)
result = client.backtest(
MyStrategy(), "bkjpn",
after=end - timedelta(minutes=15), before=end, initial_cash=1_000,
)
result.show() # inspect the run in the dashboardAvailable datasets
Common questions
How many Japan B League markets are in the archive?
2 markets from October 22, 2026 through now, of which 2 have resolved.
What data exists for each Japan B League market?
Full depth L2 order book snapshots at regular intervals, individual trades, OHLC candles, and the resolution outcome. All of it is queryable by the series slug "bkjpn" through the API and Python SDK, or downloadable as Parquet.
How much does a typical Japan B League market trade?
Average traded volume is $12.8K per market, $25.6K across the series.
Can I backtest strategies on Japan B League?
Yes. Pass the slug "bkjpn" to client.backtest() in the Python SDK. Execution mode replays order books against real historical depth; Alpha mode, one bar per market, covers every market in the series and suits its longer horizons.
Related series: ATP, MLB, WTA, NFL 2026, Premier League 2025, NBA 2026, or all sports series.
Try it
Pull Japan B League books in one call
The free tier includes 2M data rows and every market open in the last 7 days, no card required.
$ pip install marketlens