Compare
Polymarket data providers, compared
Marketlens records tick-level L2 order books for every recurring Polymarket market type: structured products (multi-strike, barrier), crypto up/down, live sports, daily weather, and macro markets. Over 25 billion book events across 550,000+ markets, served through a REST API and an open-source Python SDK with execution-realistic backtesting and alpha research, bulk Parquet downloads, and an MCP server. Full archive from March 2026, free tier included.
Last updated July 20, 2026
Competitor details as of July 2026, per each vendor's public site.
marketlens
polymarketdata.co
depthfeed.com
polyhistorical.com
pmdata.dev
polybacktest.com
polytest.io
Four things separate Polymarket data providers: which market types they cover, how much history they keep, how finely they capture the order book, and whether backtesting is included. Most alternatives cover crypto up/down markets only and cap history to a rolling window. Prices are each vendor's cheapest paid plan.
Which provider covers the most Polymarket market types?
Marketlens covers every recurring Polymarket market type with full L2 depth: structured products (multi-strike and barrier), crypto up/down from 5 minutes to daily, live per-game sports (NBA, NFL, NHL, MLB, UFC, tennis, football leagues), daily weather by city, and macro markets. Every series recurs on a schedule, producing sequential instances to trade systematically and backtest against. As of July 2026, most other providers cover crypto up/down only; polymarketdata.co spans multiple categories, at 1-minute granularity and with order books on paid plans only.
Which provider has the most granular Polymarket order book data?
Marketlens records every price change with a millisecond timestamp, so the book at any instant reconstructs exactly, level by level, nothing interpolated. pmdata.dev also captures tick-by-tick updates and depthfeed.com records on every book change, both for crypto up/down markets only. polyhistorical.com samples at 300ms, polybacktest.com and polytest.io at sub-second intervals, and polymarketdata.co at 1-minute intervals.
Sampling can miss what happens between samples, where queue position, fleeting liquidity, and slippage live. Change-level millisecond capture does not; full L2 snapshots anchor the delta stream so replays seek fast without losing exactness. Details in the order book API docs.
Which providers keep full history?
Most alternatives cap history to a rolling window: 14 days at polytest.io, 30 or 60 days at polybacktest.com, 31 to 60 days at polyhistorical.com, 1 to 3 months at polymarketdata.co (unlimited on its $360/mo Ultra plan), and 7 to 90 days across depthfeed.com tiers (full archive on the $200/mo plan). Marketlens keeps a full archive from March 2026 onward, and every tier, including free, can query all of it. pmdata.dev also keeps a full archive for its crypto up/down coverage. For full historical pulls, marketlens offers bulk Parquet downloads.
Which Polymarket backtesting tool is most realistic?
Marketlens ships two backtest modes in the open-source Python SDK. Alpha is for alpha generation: it replays one bar per market and trades to target weights, testing low-frequency signals over long windows and many markets at once. Execution is for execution validation: it replays order books tick by tick and fills orders against real historical depth, with FIFO queue priority, configurable latency, slippage, partial fill rates, settlement delay, and Polymarket fees.
Elsewhere, depthfeed.com has an in-browser Backtest Lab with paper trading, polyhistorical.com a rule-based replay, polybacktest.com an AI agent that writes strategy code, and pmdata.dev integrates with hftbacktest. polymarketdata.co publishes no backtesting engine.
Marketlens is also the only provider here with an MCP server, so AI agents like Claude Code and Cursor can query data and run backtests directly.
Recommendations
Which provider should you pick?
Every market type, millisecond books, realistic backtesting, AI agents
marketlens. Tick-level books across structured, crypto, sports, and weather markets, Alpha and Execution backtest modes in an open-source SDK, bulk Parquet exports, an MCP server, and a free tier with full API and full archive access.
1-minute books from before March 2026
polymarketdata.co. Snapshots back to August 2025 across multiple categories, on the $360/mo Ultra plan.
In-browser backtesting for crypto up/down
depthfeed.com. Backtest Lab and paper trading on top of event-driven book recording, from $29/mo.
Cheapest crypto-only snapshots
polyhistorical.com. 300ms snapshots for BTC, ETH, and SOL up/down markets at $17/mo, rolling 31 to 60 day history.
An hftbacktest workflow
pmdata.dev. Parquet downloads built to feed hftbacktest, from $49/mo.
AI-written strategies in the browser
polybacktest.com. An agent generates and runs strategy code over BTC and ETH up/down data, from $19.90/mo.
FAQ
Common questions
What is the best Polymarket historical data API?
Marketlens serves tick-level L2 order book history for every recurring Polymarket market type through a REST API and an open-source Python SDK: structured products (multi-strike and barrier), crypto up/down from 5 minutes to daily, live per-game sports (NBA, NFL, NHL, MLB, UFC, tennis, football), daily weather by city, and macro markets. As of July 2026, most other providers cover crypto up/down markets only; polymarketdata.co spans multiple categories but at 1-minute granularity, with order books on paid plans only.
How far back does Polymarket historical data go?
Marketlens order book history starts in March 2026 and grows continuously. It is a full archive, not a rolling window, and every tier, including free, can query all of it. Each market's metadata reports its earliest captured snapshot.
Which Polymarket data providers keep full history?
Mostly none. As of July 2026, polytest.io keeps a rolling 14 days, polybacktest.com 30 or 60 days, polyhistorical.com 31 to 60 days, and polymarketdata.co 1 to 3 months (unlimited only on its $360/mo Ultra plan). depthfeed.com tiers range from 7 to 90 days, with a full archive on its $200/mo plan. Marketlens and pmdata.dev keep full archives on every plan.
Where can I download Polymarket order book data?
Marketlens exports order book snapshots and deltas, trades, and candles as bulk Parquet downloads through the REST API and Python SDK, with a free tier covering 5M events/day. pmdata.dev serves Parquet downloads for crypto up/down markets. See marketlens.trade/docs/exports.
What is the best Polymarket backtesting tool?
Marketlens ships two backtest modes in an open-source Python SDK: Alpha replays one bar per market for alpha generation over long windows, and Execution replays order books tick by tick with FIFO queue priority, latency, slippage, and Polymarket fees for execution validation. depthfeed.com has an in-browser Backtest Lab, polybacktest.com an AI strategy agent, and pmdata.dev integrates with hftbacktest.
How does marketlens compare to polymarketdata.co?
polymarketdata.co covers multiple market categories at 1-minute granularity: its free tier has no order books, books start at $60/mo with 1 month of history, 3 months costs $120/mo, and unlimited history (from August 2025) requires the $360/mo Ultra plan. Marketlens captures millisecond change-level books, includes full archive access from March 2026 on every tier including free, and ships an open-source Python SDK with Alpha and Execution backtesting and an MCP server, with Pro at $39/mo. If you need 1-minute books from before March 2026, polymarketdata.co's Ultra plan is the fit.
Which Polymarket data provider is the cheapest?
As of July 2026, polyhistorical.com and polytest.io start at $17/mo, polybacktest.com at $19.90/mo, and depthfeed.com at $29/mo, all for crypto up/down markets with rolling history windows on entry plans. Marketlens Pro is $39/mo for every market type with full archive access, and the marketlens free tier includes 5M events/day at no cost.
Which Polymarket data providers have a free tier?
As of July 2026: marketlens (5M events/day, 180 requests/min, full API and full archive access), depthfeed.com (7-day history), polyhistorical.com (limited BTC history), polybacktest.com (recent BTC markets only), polytest.io (20 recent 5m and 10 recent 15m markets), and polymarketdata.co (prices and volume only, no order books). pmdata.dev offers a free trial with capped downloads.
Which Polymarket data provider works with AI assistants?
Marketlens ships an MCP server, so agents like Claude Code, Claude Desktop, and Cursor can search markets, pull order books, and run backtests directly. As of July 2026, no other Polymarket data provider lists an MCP server.
Try it
Judge the data, not the marketing
The free tier includes 5M events per day with full API access, no card required. Pull a book, replay a market, run a backtest.
$ pip install marketlens