Show HN: Layer – One API for Polymarket and Kalshi

Category: devtools

Tags: prediction-markets, api-wrapper, trading-bots, defi, ai-agents

Score: 7.3/10 (Innovation: 7, Technical: 8, Documentation: 3, Utility: 7)

Layer provides a unified API that abstracts over prediction markets like Kalshi and Polymarket, enabling developers to build trading bots and AI agents that can operate across multiple venues without platform-specific code. It normalizes equivalent markets, order books, and order execution, which is a non-trivial engineering challenge in a fragmented and emerging domain.

Target audience: backend developers and quantitative traders building automated trading strategies or AI agents

Repository: https://uselayer.sh

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