Marketlens vs polybacktest.com

polybacktest.com's pitch: describe a strategy in plain English and its Backtest AI reports whether it would have made money, over crypto up/down data with a rolling window. That is a genuinely different workflow from Marketlens, which gives you the data and an open source Python SDK to build against directly, in your own environment, with your own tooling and version control.

The trade offs: Marketlens covers every recurring Polymarket market type, keeps a permanent archive rather than a rolling window, records change level books rather than sub-second samples, and its backtests model queue priority, latency, slippage, and fees explicitly. If you want an agent to write the code, the Marketlens MCP server gives Claude Code or Cursor direct access to data and backtesting, with your own agent doing the writing.