MLB historical data
MLB is a Polymarket sports series with markets recurring daily. Marketlens has captured 18,720 markets since June 19, 2026, of which 18,651 resolved, with $110.4M in traded volume. Every market's order book is stored in full: periodic L2 snapshots plus every individual price change with a millisecond timestamp, alongside trades, candles, and the final resolution outcome.
Data as of 2026-08-10 · series slug mlb
Markets by bet type
Market counts by bet type across the series. Pass any of these as subtype= to backtest that type on its own.
Recent markets in this series
- Will there be a run scored in the first inning?: Houston Astros vs. San Diego Padres
- Houston Astros vs. San Diego Padres
- Freddy Fermin: Home Runs O/U 1.5
Backtest this series
from marketlens import MarketLens
client = MarketLens()
result = client.backtest(
MyStrategy(), "mlb", subtype="moneyline",
after="2026-08-03", before="2026-08-11", initial_cash=1_000,
)
result.show() # inspect the run in the dashboardAvailable datasets
Common questions
How many MLB markets are in the archive?
18,720 markets from June 19, 2026 through August 10, 2026, of which 18,651 have resolved and 69 are active.
What data exists for each MLB market?
Full L2 order book history (snapshots plus every price change at millisecond resolution), individual trades, OHLC candles, and the resolution outcome. All of it is queryable by the series slug "mlb" through the API and Python SDK, or downloadable as Parquet.
How much does a typical MLB market trade?
Average traded volume is $14.7K per market, $110.4M across the series.
Can I backtest strategies on MLB?
Yes. Pass the slug "mlb" to client.backtest() in the Python SDK. Execution mode replays every market's order book tick by tick and fills simulated orders against real historical depth with queue priority, latency, and fee modelling; Alpha mode replays one bar per market for slower signals over long windows. This series mixes several bet types, so pass subtype= (e.g. "moneyline") to backtest one type at a time.
Related series: FIFA World Cup, ATP, WTA, UFC, MLS 2025, Liga MX 2025, or all sports series.
Try it
Replay MLB tick by tick
The free tier includes 5M events per day with full API and full archive access, no card required.
$ pip install marketlens