SmartStake/mlb-mainlines

SmartStake MLB Mainline Odds (2026)

Full-resolution pregame odds movements on MLB mainline markets from 67 sportsbooks, exchanges, and prediction markets, for every game from 30 June through 7 August 2026. Every row is one book's price for one selection at one moment. This is the raw material behind the study "Who's Actually Sharp on MLB Mainlines After CFTC Recognition?", a companion to SmartStake MLB Player Prop Odds and Results.

Coverage

• Games: 565 game ids with a scheduled first pitch from 30 June through 7 August 2026 (US Eastern dates). The All-Star Game (14 July) is included.
• Window: pregame only. Every row has ts < start_time.
• Markets: moneyline, run line, and total runs, each for the full game, the 1st half (first 5 innings), and the 1st inning.
• Books: 67, including Pinnacle, Kalshi, Polymarket, Novig, ProphetX, 4Caster, FanDuel, BetOnline, DraftKings, and Fanatics (the ten in the study).
• Rows: ~150 million.
• Coverage gap: the odds archive was down from 20 June until the evening of 30 June 2026 (UTC), so games on the first days of the window are missing their earliest quotes.

Schema

column	type	description
game_id	string	Per-game identity. Group on this.
start_time	timestamp	Scheduled first pitch (UTC). Subtract ts for time to first pitch.
home_team	string	Home team.
away_team	string	Away team.
market	string	moneyline, run line, total runs, or the same with a 1st half or 1st inning prefix.
line	double	The run line handicap or the total. Null for moneylines.
side	string	home or away for moneylines and run lines; over or under for totals.
book	string	Sportsbook / exchange / prediction market.
ts	timestamp	When the quote was recorded (UTC), millisecond resolution.
odds	double	Decimal odds as displayed by the book.
is_suspended	bool	true when odds <= 1.02: the market was pulled, not a real price.
is_alt	bool	true for an alternate (non-main) line.
is_deleted	bool	true when the book removed the selection at ts.
max_bet_size	double	The book's posted limit or the size resting at that price, where the feed carries one. Null otherwise.
contract_id	string	The exchange contract ticker (Kalshi and similar). Null for sportsbooks.
game_date	date	Partition key: the US Eastern date of first pitch.

Notes and caveats

• Suspensions are kept but flagged. A book (Pinnacle especially) often pulls a market before reposting a new number; those ticks carry odds <= 1.02 and is_suspended = true. Filter them out before treating odds as a price.
• Removed selections are kept but flagged. Rows with is_deleted = true mark a selection leaving the board, and their odds is often null.
• Odds are raw. Nothing is de-vigged. Devig each book's two sides yourself before comparing books.
• Exact duplicate rows are removed; nothing else is. Thin-book prints on the exchanges are left in on purpose, since they are part of what the study measures.
• Prediction markets list each team as its own contract. contract_id tells you which contract a quote came from.

Loading

import pandas as pd
df = pd.read_parquet("hf://datasets/SmartStake/mlb-mainlines/game_date=2026-07-10")

-- DuckDB, straight from the hub
SELECT book, count(*) FROM 'hf://datasets/SmartStake/mlb-mainlines/**/*.parquet' GROUP BY 1;

Provenance, license, and responsible use

Odds were collected from public sportsbook and exchange feeds. Released under CC BY 4.0 for research and educational use. This dataset is informational and historical: past prices do not predict future outcomes, and betting carries risk of loss. Not affiliated with any sportsbook. 21+.

Citation

SmartStake (2026). SmartStake MLB Mainline Odds (2026). Hugging Face.