> Markdown version of [/tools/marketlens](https://launchpoly.com/tools/marketlens) — served by LaunchPoly, the directory of Polymarket, Kalshi and other prediction market tools. # Marketlens The historical data and backtesting API for Polymarket. Works with[Polymarket](/tools?market=polymarket) [Trading](/category/trading), [Data & APIs](/category/data), [Developer Tools](/category/api) · freemium · API, Web [Visit website](https://marketlens.trade/) Vote19 votes. Upvote Marketlens Share 1 / 2 ## About Marketlens Marketlens is a historical data and backtesting API covering roughly 4,000 live Polymarket markets, including 5-minute crypto up/down windows, monthly options strikes, per-game sports markets, and daily weather buckets across cities in the Americas, Europe, and Asia-Pacific. It records every order book at tick resolution, providing L2 snapshots and deltas, trades, and candles. A Python SDK offers auto-paginating iterators, DataFrame output, and bulk Parquet exports, and data can be streamed from the API or run fully offline from a downloaded export. The backtesting engine replays strategies against real historical book depth at millisecond resolution, modeling queue priority, latency, slippage, and fill realism rather than idealized fills. It also includes a bar-cadence mode where a strategy declares target exposures per signal and the engine trades toward them, along with tools for extracting implied probability distributions and survival curves from multi-outcome markets. The tool is aimed at people building or testing Polymarket trading bots and quantitative strategies who need real order book depth rather than just price history. Data collection is checked against CLOB ground truth with automatic reseeding on drift and redundant connections. Pricing is freemium: a free tier (180 requests/minute, 5M events/day, 1 API key) requires no card, with paid Pro ($39/month, 3,600 req/min, 5B events/day, 5 keys) and Enterprise ($199/month, 10,800 req/min, unlimited events/day, 25 keys) tiers for heavier use. The SDK is open source on GitHub, and the data can also be accessed through an MCP server for agent-based workflows. Marketlens is a freemium trading tool built for Polymarket traders — The historical data and backtesting API for Polymarket. It is listed in the LaunchPoly directory, where it was added on August 2, 2026 and currently has 19 community votes this round. Marketlens records every Polymarket order book at tick resolution. You get L2 snapshots and deltas, trades, and candles across ~4,000 live markets. Coverage spans Polymarket's recurring markets: 5-minute crypto up/down windows, monthly options strikes, per-game sports markets, and daily weather buckets. The Python SDK ships clients with auto-paginating iterators, DataFrame output, and bulk Parquet exports. The backtesting engine replays strategies against real book depth. Queue priority, latency, slippage, and fill realism are all modeled. For alpha research there is a bar-cadence mode: declare target exposures per signal and the engine trades to them. Data streams from the API, or runs fully offline from a downloaded export. Free tier included, no card required. ## Questions about Marketlens ### What is Marketlens? Marketlens is a freemium trading tool for Polymarket. The historical data and backtesting API for Polymarket. ### Is Marketlens free to use? Marketlens is freemium: there is a free tier, with paid plans for advanced features. ### What category does Marketlens belong to? Marketlens is listed under Trading, Data & APIs, Developer Tools on LaunchPoly's prediction market tools directory. ### How is Marketlens ranked on LaunchPoly? Marketlens is ranked by community votes from real traders. Votes reset every other Sunday, and it currently has 19 votes this round. ## At a glance Category Trading, Data & APIs, Developer Tools Pricing freemium Works with Polymarket Platforms API, Web Votes this round 19 Listed August 2, 2026 Updated October 15, 2026 ### Links [GitHub](https://github.com/marketlenstrade/marketlens-python)[X](https://x.com/marketlenstrade)[Docs](https://marketlens.trade/docs) Report Support this tool ## Boost Marketlens Give this listing a sponsored homepage card. Anyone can buy a Boost, including guests. - **3 days**$15 - **7 days**$29 - **14 days**$49 - Review available dates before paying - Clearly labelled as sponsored - Community votes and ranking stay unchanged Boost this listing One-time card payment. You are buying promotion, not ownership of the listing. [Choose another listing →](/boosts) Support this tool ## Boost Marketlens Give this listing a sponsored homepage card. Anyone can buy a Boost, including guests. - **3 days**$15 - **7 days**$29 - **14 days**$49 - Review available dates before paying - Clearly labelled as sponsored - Community votes and ranking stay unchanged Boost this listing One-time card payment. You are buying promotion, not ownership of the listing. [Choose another listing →](/boosts) ## More like this [All Trading](/category/trading) [ ### Gondor DeFi layer prediction market 53 votes this round ](/tools/gondor)[ ### Bullpen Trade token, perps and predictions 51 votes this round ](/tools/bullpen)[ ### Matchr The Aggregation Layer 43 votes this round ](/tools/matchr) ## Related guides [All guides](/blog) [ ### Top 10 Polymarket Trading Strategies That Actually Work (2026) Master these proven trading strategies to maximize your returns on Polymarket. 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