Kalshi arbitrage scanner
Live Kalshi and Robinhood arbitrage, matched against Polymarket and PredictIt, with the spread flagged the moment combined cost drops under $1.
Kalshi arbitrage is buying opposing outcomes for the same event on Kalshi and another venue for a combined price under $1.00, locking a guaranteed $1 payout for less than a dollar. Because Robinhood's prediction markets settle on Kalshi's exchange, a Kalshi leg is tradeable on either at the same price. The most common setup is cross-platform: the same event prices a few cents apart on Kalshi versus Polymarket, so you buy the cheap Yes on one and the cheap No on the other.
This scanner pulls Kalshi alongside Polymarket and PredictIt, normalizes every market to a single Yes/No price, confirms both markets resolve on identical criteria, and flags the pair the instant the combined cost drops under $1. Kalshi is a US-regulated (CFTC) exchange, which is why it often prices sharper than the crowd-driven crypto venues: those small, persistent gaps are the edge this board tracks.
The spreads are usually thin and short-lived, and fees plus slight differences in each venue's resolution rules can eat them, so verify before you trade. Each live arb comes with a step-by-step walkthrough, and the same data is a free API and MCP tool if you would rather a bot watch Kalshi for you.
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Free arbitrage API and MCP tool for bots
Every match on this page is also a free JSON endpoint and an MCP tool, so a trading bot or AI agent can poll live opportunities and act on them without scraping each venue.
Questions
- What is Kalshi arbitrage?
- Buying the Yes on one venue and the No on another for the same Kalshi-listed event, for a combined cost under $1, so the $1 payout is locked regardless of the outcome. Usually it is Kalshi versus Polymarket.
- Is Kalshi and Robinhood the same for arbitrage?
- Effectively yes. Robinhood’s event contracts trade on Kalshi’s exchange (KalshiEX) at the same price, so a Kalshi leg on this board is tradeable on either.
- Kalshi vs Polymarket arbitrage: which is cheaper?
- It varies by event and by the minute. Kalshi is US-regulated and often prices sharper; Polymarket is crypto-settled and moves on crowd flow. The board lays both side by side so you can see which side is the cheap leg right now.
- Is Kalshi arbitrage profitable?
- Edges are typically 1-5% and fleeting, and fees plus resolution-wording differences can erase a thin one. On real, verified mismatches with fast execution it can pay, which is exactly what this scanner surfaces.
- Is there a Kalshi arbitrage bot or API?
- Yes. The free JSON API (
/api/v1/arbitrage) and theget_arbitrageMCP tool return every matched Kalshi pair and its live prices, so a bot or agent can poll and act without scraping Kalshi.