Guides

Prediction-market data guides

Practical, honest guides to getting and using prediction-market data — the Polymarket and Kalshi APIs, real-time delivery, whale tracking, and the resolution that makes it trustworthy.

Polymarket API: how to get real-time Polymarket data

Polymarket's own Gamma, CLOB, and Data APIs explained — and how to get normalised signals plus calibrated resolution without building the pipeline yourself.

Kalshi API: how to get real-time Kalshi data

Kalshi's REST and WebSocket APIs, what's hard about them, and getting Kalshi data alongside Polymarket in one schema.

Polymarket vs Kalshi: what's the difference?

How the two biggest prediction markets differ — regulation, settlement, infrastructure — for traders and for builders pulling their data.

How to track Polymarket whales

Why large-trade and smart-wallet data on Polymarket is public, what's hard about using it, and how to get whale-flow signals by API.

Real-time data: webhooks vs REST vs WebSocket

The three ways to move prediction-market data, when to reach for each, and how to skip building the ingestion layer.

Try it free, no signup. Idmon's /public/* endpoints serve most of the data at 60 requests/min with no key — see the docs. For real-time push and a commercial licence, request a key.