Polymarket Historical Data & Order Book API

Trusted by researchers at leading institutions

Bridging the Professional Data Gap

The difference between basic price tracking and a robust infrastructure built for professional-grade research.

Feature	Public API	Our Database
Order Book History Full History (Bids/Asks Depth)	Only Last Snapshot	Full History (Bids/Asks Depth)
Market Metrics Hist. Spread, Volume, Liquidity	Limited	Hist. Spread, Volume, Liquidity
Resolved Events Fully Queryable	Not available	Fully Queryable
Data Structure Flexible (SQL, Parquet, CSV, JSON)	JSON	Flexible (SQL, Parquet, CSV, JSON)

Engineered for Trading and Research

API access is our primary product for integrating Polymarket historical data into research and trading systems, with export and direct-delivery options for batch workflows.

API-First Access
GET /v1/markets/{id}/books
Access series, events, markets, prices, metrics, and order books over API for reproducible quantitative research and production trading systems.
Complete Historical Model
series → events → markets
Query the full hierarchy of series, events, and markets with historical market state, resolution outcomes, and metadata for backtests and analytics.
Exports and Direct Delivery
S3 · Parquet · CSV
Beyond API calls, we support recurring exports and direct delivery so teams can run large historical pipelines without changing internal tooling.

See API docs

SELECT * FROM series WHERE type = 'Politics' ORDER BY updated_at DESC

Series: 2028 Presidential Electionser_0x1a64...

Event: Who will win the U.S. presidential election?

Market: Winner of 2028 Election

Market: Popular vote winner

updated_at: 00:00:00 UTC

Series: Fed Policy Outlookser_0x42111...

Event: Will the Fed cut rates before July?

Market: Rate cut before July

Market: Terminal rate below 4.00%

updated_at: 00:00:01 UTC

Series: Crypto Macro Regimeser_0x9f1be...

Event: Will BTC close above 120k by year-end?

Market: BTC above 120k

Market: ETH above 7k

updated_at: 00:00:02 UTC

19B+

Rows

1M+

Unique Markets

Res

Data Your Way

Bulk S3 exports, direct REST API access, a Python SDK, or a custom cut of exactly the data you need.

s3://your-bucket/polymarket/

├─ markets.parquet

├─ prices/2025-10-15.parquet

├─ books/2025-10-15.parquet

└─ books/2025-10-16.parquet

S3 Dumps

Full dataset drops in Parquet, CSV, or JSON — one-time or on a schedule.

GET /v1/markets/{id}/prices

?resolution=1m&limit=1000

200 · cursor: next

REST API

Query markets, trades, and prices programmatically with your API key.

from polymarketdata import PolymarketDataClient

client = PolymarketDataClient()

usage = client.utility.usage()

>>> usage.plan

Python SDK

Pull data with a Python-first client for faster research and backtesting workflows.

range 2025-08-01 → 2025-09-30

Politics1hCSV

Custom Exports

Pick a time range, filter by category, and get exactly the slice you need.

FAQ

Quick answers about API access, data coverage, and enterprise options.

The Polymarket public API only returns live market state — there's no historical endpoint. We store and serve complete time series: every minute of price history, market metrics, and L2 order book snapshots from August 2025 onward. You also get structured discovery across 1M+ unique markets and consistent formats built for pipelines, not one-off lookups.

Choose your plan

Pick the access level that matches your request volume and granularity. You can upgrade or downgrade anytime.

Enterprise & Institutional

Licensed data, dedicated delivery and support for organisations of any size.

Provided by Qelso, our enterprise service.

Visit Qelso

25% off yearly

View full pricing details