Build a Baseball Live Odds App: Architecture & Code

Core architecture for baseball odds

• Ingestion: Poll /baseball/odds endpoint every 1-2 minutes for pre-game lines
• Processing: Normalize moneyline, run line, and totals across bookmakers
• Delivery: Push updates to clients, highlight line movements

Baseball betting markets

The Baseball API returns three primary markets for each game:

Moneyline

Pick the winner outright. Negative odds indicate favorite, positive indicate underdog.

Run Line (Baseball Spread)

Typically -1.5/+1.5 runs. Favorite must win by 2+, underdog can lose by 1.

Totals (Over/Under)

Combined runs scored by both teams.

Fetching baseball odds

Line movement detection

Track odds changes over time to identify sharp money and value:

Polling vs real-time

• Pre-game (24h out): Poll every 5-10 minutes
• Pre-game (1h out): Poll every 1-2 minutes
• During game: Odds typically locked, minimal polling needed

Best odds finder

Compare across bookmakers to find the best available line:

UI/UX patterns for baseball odds

• Show team logos and matchup prominently
• Highlight line movements with up/down arrows and colors
• Display odds in American format (-145, +125) for US users
• Show opening line vs current line comparison
• Group games by date and start time

Latency optimization

• Cache odds responses for 60 seconds minimum
• Use edge locations close to users
• Batch requests for multiple games
• Implement stale-while-revalidate pattern