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Prediction Market Arbitrage: 6 Opportunities Live Now, Up to 277% ROI

Our cross-venue engine has identified six live prediction market arbitrage opportunities, allowing users to lock in guaranteed profits by betting on the same event across different platforms.

3 min read
Live prediction market arbitrage board across Polymarket, Kalshi and PredictIt on August 29, 2026
Key Takeaways
  • 1
    Six prediction market arbitrage opportunities are currently live across Polymarket, Kalshi/Robinhood, and PredictIt.
  • 2
    The most lucrative opportunity offers a 277.4% ROI on the 2026 South Carolina Senate election.
  • 3
    Other notable spreads include Trump's recognition of Somaliland and potential Putin-Zelenskyy meeting locations.
  • 4
    Arbitrage opportunities involve buying YES on one platform and NO on another for under $1 total, guaranteeing a profit.
  • 5
    Spreads can close quickly, and fees, KYC, and withdrawal limits will impact actual returns.

For those new to prediction markets, an arbitrage lock occurs when you can buy a 'YES' contract on one venue and a 'NO' contract on another for the same real-world event, with their combined cost being less than $1. This guarantees a payout, regardless of the outcome, as one of your contracts will always resolve to $1.

As of August 29, 2026, our engine has surfaced six such opportunities across Polymarket, Kalshi/Robinhood, and PredictIt. These spreads can close rapidly, and potential returns are subject to fees, KYC requirements, and withdrawal limits on each platform. This information is for educational purposes only and is not financial advice.

Track these live, or poll the free API

The board above refreshes on its own, so this page stays current long after today. The full cross-venue feed lives on the arbitrage board, and every match is also a free JSON API and an MCP tool, so a trading agent can poll live Polymarket, Kalshi and PredictIt arbitrage opportunities and act on them.

curl https://www.startuphub.ai/api/v1/arbitrage?arbs_only=1

Read the arbitrage API reference or open the live JSON endpoint.

Focused guides: Polymarket arbitrage, Kalshi arbitrage, and the arbitrage bot API.

Informational feed, not financial advice. Live arbitrages are often fleeting, and fees, gas, KYC and withdrawal limits eat into the spread. Verify each market’s resolution rules and costs before trading.

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#prediction markets#arbitrage#polymarket#kalshi#predictit