Python Monitor Tracks Price Gaps Between Polymarket and Kalshi Prediction Markets
A DEV Community tutorial shows how to build a Python agent that polls prediction markets Polymarket and Kalshi for the same event's probabilities. The author cites an October 18, 2024 example in which the two platforms priced the Fed's October rate decision about four percentage points apart. Manually tracking several platforms is impractical, so the agent automates polling, normalizes contract prices to a 0-1 probability scale, and computes the spread. The design uses asyncio for concurrent requests, public APIs only, and explicit termination via a maximum iteration count or keyboard interrupt. The post also flags challenges such as differing API formats, inconsistent contract wording, and error handling.
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