Marketlens vs polybacktest.com
A browser-based service for crypto up/down markets where an AI agent writes and runs strategy code over sub-second book snapshots. Below is how it compares to Marketlens on market coverage, book resolution, history depth, backtesting, and price.
Last updated August 3, 2026
Competitor details as of August 2026, per each vendor's public site.
marketlens
polybacktest.com
How Marketlens differs from polybacktest.com
polybacktest.com's pitch: describe a strategy and its agent writes and runs the code in the browser, 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 the agent-writes-the-code workflow, the Marketlens MCP server gives Claude Code or Cursor direct access to data and backtesting, with your own agent doing the writing.
Which should you pick?
Pick marketlens
Every recurring Polymarket market type at millisecond book resolution, a permanent archive on every tier including free, backtesting with queue priority and fees, Parquet exports, and an MCP server. Pro is $29/mo.
Pick polybacktest.com
You do not write Python and want an in-browser agent to generate and run crypto up/down strategies end to end. Data plans start at $19.90/mo and the AI agent plan is $35/mo.
FAQ
Common questions
What is the best polybacktest.com alternative?
Marketlens, if you want full market coverage, permanent history, and code you own. It records millisecond L2 books for every recurring Polymarket market type, keeps the complete archive on every tier, and ships an open source Python SDK with execution realistic backtesting plus an MCP server for AI coding agents. Free tier included; Pro starts at $29/mo.
How much history does polybacktest.com keep?
A rolling 31 days on standard plans, extendable to 120 days with add-ons, as of August 2026. Marketlens keeps its full archive from March 2026 on every tier.
Can AI agents use Marketlens like polybacktest.com's agent?
Yes, through the MCP server. Claude Code, Claude Desktop, and Cursor can search markets, pull order books, and run backtests directly. The difference is that the strategy code lives in your repository and runs in your environment rather than inside a vendor's browser sandbox.
Does polybacktest.com cover sports or weather markets?
No. Its data covers crypto up/down markets plus a few equity index markets on paid plans, as of August 2026. Marketlens records every recurring Polymarket market type, including per game sports, daily weather, equities earnings, and structured multi-strike products.
Other alternatives: polymarketdata.co, depthfeed.com, polyhistorical.com, pmdata.dev, polytest.io, or the full provider comparison.
Try it
Judge the data, not the marketing
The free tier includes 5M events per day with full API and full archive access, no card required. Pull a book, replay a market, run a backtest.
$ pip install marketlens