Layer

Layer is a prediction market API that connects trading bots and AI agents to Kalshi and Polymarket.

Layer is an API platform designed for trading bots and AI agents operating on prediction markets like Kalshi and Polymarket. It normalizes data, streams order books, finds matching bets across venues, and handles order execution and cancellation. The service compares prices and fees side by side, tracks positions and fills, and supports paper trading and backtesting using historical tick data. It is built for developers creating automated trading strategies who want to avoid integrating multiple venues separately. Security features include client-side API keys and budget limits with a manual kill switch.

Layer at a glance

Best for: Software engineer
Runs on: API, Web
Pricing: Free
Released: October 2026
Category: AI agent tool
Website: uselayer.sh

Key features

Unified API for prediction markets
Stream normalized order books
Find matching bets across venues
Place and cancel orders
Track positions and fills
Paper trading and backtesting
Budget limits and kill switch

Use it for

Run a trading bot across multiple prediction market venues
Arbitrage price differences between venues
Let an AI agent trade news events with budget limits
Backtest trading strategies on historical venue data

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