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Put-Call Parity Arbitrage Calculator for KALSHI Trades

A put-call parity arbitrage calculator is a practical tool for Kalshi traders evaluating YES and NO spreads on binary markets. This article explains how the calculator identifies risk-defined edges when the best-ask prices on YES and NO don’t sum to a full dollar. By framing the edge in cents, you can target concrete, repeatable opportunities in intra-market arbitrage. Real-world use cases include evaluating single binary contracts and small combinatorial bundles under one event ticker. KalshiArb’s YES + NO < $1.00 alerts help you act when the edge appears.

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How put-call parity applies to Kalshi binary markets

In Kalshi’s binary markets, each contract has a YES and a NO side that together should approximate $1. A put-call parity arbitrage calculator looks at the best-ask prices for YES and NO and flags when their sum falls below $1.00. The resulting gap represents a risk-defined edge: buy both sides and lock in the profit as the market resolves, minus the per-contract fee. This edge is most visible on liquid markets with tight spreads and is dynamic as new quotes arrive.

Using the calculator for intra-market arbitrage

To use the calculator effectively, input the current YES and NO ask prices for a given market. If YES_ask plus NO_ask is less than $1.00, you have a taxable, self-contained edge. KalshiArb can monitor these conditions in real time and alert you when the edge crosses a threshold. Keep in mind that fees apply to both legs and can compress the apparent edge, so you must account for the fee curve when sizing positions.

Extending to combinatorial event children

Some Kalshi events are bundles of mutually exclusive child markets under one event ticker. The calculator can assess the sum of best-ask YES prices across all child markets. If the total is below $1.00, a complete set of child YES contracts can lock in a spread. This approach increases edge opportunities but also requires careful tracking of each leg’s liquidity and the impact of Kalshi’s fees on multi-contract positions.

Practical tips for deployment and alerts

Run the calculator alongside live REST data and WebSocket feeds to minimize latency between quote changes and execution decisions. KalshiArb’s alerting system can notify you the moment the edge materializes, enabling quick, non-custodial trading. Always verify that the resolution rule and data source for each market are current before placing any orders.

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Sign up to KalshiArb for alerts and fast execution on YES + NO arbitrage opportunities. Our non-custodial scanner stays off your funds, and pricing plans include access to edge alerts for Kalshi markets.

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FAQ

What is a put-call parity arbitrage calculator in Kalshi terms?
It is a tool that compares the YES and NO ask prices on a Kalshi binary market and flags when their sum is less than $1.00, signaling a potential risk-defined edge to buy both sides.
Does this edge guarantee profit?
No. The edge is contingent on execution, fees, and precise settlement timing. The calculator highlights a theoretical opportunity, not a guaranteed outcome.
Can I use this for combinatorial markets under one event ticker?
Yes. If the sum of best-ask YES prices across all child markets falls below $1.00, you can consider purchasing a full set of child YES contracts to lock in the spread, subject to liquidity and fees.
What should I watch besides the edge value?
Monitor Kalshi’s fee curve, minimum price increments, and per-contract fee impact. Also track resolution rules and data sources to ensure correct settlement.

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