Data & APIs

PolyOrderBooks

PolyOrderBooks archives historical L2 order books for Polymarket crypto markets, so your backtests reflect real depth and slippage.

Be the first to rate Safety reviewed Updated
Launch PolyOrderBooks
Preview of PolyOrderBooks

PolyOrderbooks: Historical Order Book Data API for Polymarket Crypto

What is PolyOrderBooks?

PolyOrderbooks is a historical data API and Python SDK that archives Level 2 order book snapshots, prices, and liquidity metrics for Polymarket crypto markets so researchers and traders can backtest strategies against real market depth.

Ready to try PolyOrderBooks?

Open the official site and get started in a few clicks.

Launch PolyOrderBooks

PolyOrderBooks Overview

PolyOrderbooks stores historical Level 2 order book data for Polymarket crypto markets. Its collectors snapshot open books every second, so the full bid and ask ladders survive even after a market moves or resolves. Prices and liquidity metrics sit on the same timeline, and closed markets stay in the archive with their winning outcome. The index covers hundreds of thousands of markets and hundreds of millions of snapshots.

The tool is for quantitative researchers, strategy developers, and bot builders who need realistic backtests. Mid price charts tell you where a market traded, but not whether your size could have filled. If you have ever watched a paper strategy fall apart live because the book was thin, this archive answers that question before you risk money. Analysts who study prediction market microstructure get spread behavior and depth patterns across many markets and time windows.

You sign up, generate an API key in the dashboard, and search markets by keyword through the discovery endpoints. History endpoints take a start timestamp, end timestamp, and resolution, then return the matching books, prices, and metrics. A cursor handles pagination on long ranges. Access comes through a REST API, an official Python SDK (pip install polyorderbooks), or enterprise S3 bulk exports in Parquet, CSV, or JSON. The free Starter plan gives you 60 second resolution and a 7 day history window. Pro at 19 dollars per month opens 1 second snapshots and 31 days of history, and Scale at 49 dollars extends that to 90 days.

What sets it apart is market depth instead of mid prices. Most Polymarket data APIs hand you a price series and leave you guessing about fills. Here you walk the actual ladder, estimate slippage for a given order size, and check whether liquidity existed when your signal fired. The aligned timestamps across books, prices, and metrics save real pipeline work. I also like that the limits are plain. The usage endpoint tells you where you stand before you hit a wall, and the free tier is enough to validate the data before you pay anything.

PolyOrderBooks Key features

  • Historical L2 snapshots

    PolyOrderbooks stores full bid and ask ladders as price size pairs for each outcome. You can replay market depth at any captured moment and estimate fill price and slippage for a given order size.

  • Aligned price history

    Prices and liquidity metrics share the same capture timeline as the books. Queries with the same start and end timestamps return series that join without extra alignment work.

  • Market discovery

    Search markets by keyword and filter by status, volume, dates, and tags. Each result includes the slug, question, outcomes, and identifiers you need for history calls.

  • Resolved market archive

    Closed markets stay queryable after they settle. You can pull the historical books and the final winning outcome for post event analysis.

  • Flexible resolution

    Collectors snapshot open markets every second. You can query at 1 second on higher plans or at 60 second to 1 day buckets on any plan.

  • Multiple access methods

    Use the REST API with any language, the official Python SDK, or enterprise S3 bulk exports in Parquet, CSV, or JSON.

  • Usage endpoint

    One endpoint reports your current plan, remaining limits, allowed granularity, and history window. Your code can check bounds before it hits a rate limit.

  • Cursor pagination

    Long time ranges return a next cursor so you can fetch the full history page by page with no gaps.

PolyOrderBooks Fees

  • Starter plan Starter is free with no credit card required, and includes 60 second resolution, a 7 day history window, 60 requests per minute, and 1,000 requests per day.
  • Pro plan Pro costs 19 dollars per month and unlocks 1 second resolution, a 31 day history window, 300 requests per minute, and 50,000 requests per day, plus email support.
  • Scale plan Scale costs 49 dollars per month and keeps 1 second resolution, extends history to 90 days, and raises limits to 1,000 requests per minute and 200,000 requests per day with priority support.
  • Enterprise plan Enterprise is custom priced and supports negotiated rate limits, longer history, SLAs, and bulk S3 exports on one time or scheduled delivery.
  • Payment methods Paid plans accept card or a wide range of cryptocurrencies, and plan changes and cancellations are handled in the dashboard billing portal.

How to use PolyOrderBooks

  1. Create your account

    Go to the signup page and register with your email and a password, or sign up with Google.

  2. Verify your email

    Check your inbox and confirm your address if the site asks you to. API keys are only issued after verification.

  3. Generate an API key

    Open the dashboard, go to the API keys section, and create a new key. Copy it immediately since you will need it for every request.

  4. Set up authentication

    Store the key as an environment variable, or pass it in the X-API-Key header. The Authorization Bearer header works too.

  5. Test your key

    Call the usage endpoint to confirm everything works. The response shows your current plan, remaining limits, allowed granularity, and history window.

  6. Search for markets

    Query the discovery endpoint with a keyword like bitcoin, set a limit, and filter by status if needed. Note the slug of the market you want to study.

  7. Request order book history

    Send a history request for that slug with start_ts and end_ts in UTC ISO format, plus a resolution your plan allows. Starter plans get 60s, while Pro and above get 1s.

  8. Paginate through results

    If the response includes a next_cursor, pass it in your next request to fetch the following page. Repeat until no cursor comes back.

  9. Install the Python SDK

    Run pip install polyorderbooks, then create the client with your API key. Use its methods to list markets and fetch books, prices, or metrics with the same time parameters.

  10. Ask about bulk exports

    For large scale needs, email the enterprise contact to arrange S3 drops in Parquet, CSV, or JSON on a one time or scheduled basis.

Is PolyOrderBooks safe & legit?

An independent team runs PolyOrderBooks, and it states clearly that it is not affiliated with or endorsed by Polymarket; no founder names or team bios are public. The service is read only, so it never executes trades, holds funds, or asks for a wallet connection, and the independent prediction markets wiki lists it with high verification confidence. The one real red flag is that limited team transparency, so start on the free plan and validate sample data against markets you know before paying.

X account intel @polyorderbooks

  • Based in India
  • Joined X May 2026 3 months ago
  • Username changes 2 renames last on Aug 2, 2026
  • Signup source India App Store

Public profile signals from X. Use as one input alongside other due-diligence.

PolyOrderBooks Reviews & Comments

Rate PolyOrderBooks

Be the first to rate

No reviews yet. Be the first to share your experience.

Leave a comment

Email is not shown publicly. Comments are reviewed before appearing.

PolyOrderBooks alternatives

Other Polymarket tools that do a similar job. Compare and pick what fits your workflow.

  • Predexon

    Predexon gives developers one API to read data and execute trades across Polymarket, Kals…

    Web
    Compare

  • Polymarket CLI

    Developers and AI agents get full terminal access to Polymarket markets, order books, tra…

    Free
    Compare

  • Polymarket Analytics

    Traders who want to copy top Polymarket wallets or spot fading opportunities use Polymark…

    WebFree
    Compare

  • Polybacktest

    Polybacktest provides granular historical order book data to help traders simulate strate…

    Compare

Recommended reading

In-depth guides for Data & APIs — get more out of tools like PolyOrderBooks.

Ready to try PolyOrderBooks?

Open the official site and get started in a few clicks.

Launch PolyOrderBooks
For builders

List your tool in front of thousands of traders — free to submit, reviewed in a few days.

Submit your tool