Layer
One API for Polymarket and Kalshi
About Layer
One API for prediction markets. Find markets, stream normalized data, place orders, and track positions across Kalshi and Polymarket.
Before you try it
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In the maker’s words
Hi HN, I'm David. I built Layer, an API + SDK or building trading bots/ai agents across prediction markets. The idea came from something i kept running into while playing with trading bots. Once your bot needs access to more than 1 venue, you suddenly have to deal with different market schemas, contract definitions, prices, fees and APIs before you can reason about where to trade. That gets messy real fast, especially with prediction markets. The same real-world event can exist on Kalshi & Polymarket, but the contracts can be represented differently. Here's my broader thesis: as more trading becomes automated, bots/agents will need a common interface to access different financial markets. Prediction markets felt like a good place to start because the fragmentation is obvious. With Layer's SDK, you can: - pull normalized prediction-market data - match equivalent markets across Kalshi and …
Where people found it
- Hacker NewsShow HN: Layer – One API for Polymarket and Kalshi4 points1 comments2 days ago
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