Prediction market arbitrage and odds comparison

MarketMaster focuses on comparing prices and potential cross-market opportunities.

• Free and paid
• Polymarket
• Kalshi

PolyScalping combines a Polymarket market scanner with wallet analytics and reward research. Its public site also presents trading-fee leaderboards and historical fee statistics. Those venue-fee statistics are not a subscription price for PolyScalping.

• Free option
• Polymarket

OddsFantasy focuses on comparing prices and potential cross-market opportunities.

• Free and paid
• Polymarket

ArbEdge focuses on comparing prices and potential cross-market opportunities.

• Paid or fee-based
• Polymarket
• Kalshi

Arbitrage Agent focuses on comparing prices and potential cross-market opportunities.

• Paid or fee-based
• Polymarket
• Kalshi

CrossOdds focuses on comparing prices and potential cross-market opportunities.

• Free and paid
• Polymarket
• Kalshi

Prediction Market Intelligence Platform focuses on comparing prices and potential cross-market opportunities.

• Free and paid
• Polymarket
• Kalshi

SpreadCore compares bookmaker prices with Polymarket and provides a terminal and hedge-sizing workflow. Its homepage describes direct Polymarket orders while showing the bookmaker stake to place separately. Price differences alone do not establish that both legs can fill or settle on identical terms.

• Polymarket

Premarket focuses on comparing prices and potential cross-market opportunities.

• Polymarket
• Opinion

ArbiTrack focuses on comparing prices and potential cross-market opportunities.

• Polymarket
• Kalshi
• PredictIt

DOZOR.BET focuses on comparing prices and potential cross-market opportunities.

• Polymarket
• Kalshi

AlertPilot’s arbitrage view compares quoted prices across Polymarket, Kalshi, Opinion and Probable. It presents potential cross-platform spreads through a browser interface with mobile and desktop layouts.

• Polymarket
• Kalshi

CRYPTOLINE describes a terminal for comparing Polymarket and Kalshi spreads, with alerts and a Telegram Mini App.

• Polymarket
• Kalshi

DOZOR.BET focuses on comparing prices and potential cross-market opportunities.

• Polymarket
• Kalshi

WEB3 BET describes esports arbitrage scanning across bookmakers, Polymarket and Kalshi, with staking calculations, order books and a profit-and-loss journal.

• Polymarket
• Kalshi

Rust arbitrage bot for cross-platform trades between Kalshi and Polymarket. Configured through environment variables with a dry-run paper mode by default and live execution when disabled.

• Free option
• Polymarket
• Kalshi

Python bot scanning thousands of Polymarket and Kalshi markets for cross-platform and YES+NO bundle mispricings, with market making, risk limits, fee accounting, a web dashboard and simulation mode.

• Free option
• Polymarket
• Kalshi

FastAPI backend and Next.js dashboard that poll Polymarket CLOB and Kalshi every second for Bitcoin 1-hour price markets, flagging opposing-position combinations costing under $1. Detection only.

• Free option
• Polymarket
• Kalshi

Educational Node.js bot built on pmxt that buys YES on one platform and NO on the other when Polymarket and Kalshi prices sum below $1. Market orders; dry run default.

• Free option
• Polymarket
• Kalshi

Free calculator for event-contract arbitrage: enter odds from Kalshi, Polymarket, Robinhood or Interactive Brokers and it returns fee-adjusted spreads and stake splits.

• Free option
• Polymarket
• Kalshi
• Robinhood

Scanner that flags YES/NO price gaps across Polymarket, Kalshi and Opinion (990+ matched pairs), with alerts and a REST API on higher tiers. Does not place trades.

Website did not answer at the last check

• Paid or fee-based
• Polymarket
• Kalshi
• Opinion