Name: Polymarket Gamma API: editorial review
Rating: 4
Author: Polytoolhub

What is Polymarket Gamma API?

Gamma is the official discovery and metadata API. It explains what a market is, how it belongs to an event or recurring series and which outcome tokens correspond to it. Public data can be queried without account credentials, making it the natural starting point for a market browser or research index.

Who it is for

Developers building searchable market catalogs
Research pipelines that need market definitions and tags
Sports applications aligning games, teams and contract types

Features and coverage

Available on: REST API
Markets & venues: Polymarket

Event discovery
Read a known event or page through an event feed.
Market metadata
Fetch individual binary markets and the identifiers needed for downstream APIs.
Tags and filters
Limit listings by relevant category, status or supported attributes.
Recurring series
Group events under recurring themes.
Sports metadata
Discover leagues, teams and market types such as moneyline, spread and totals.
Game-linked events
Use game IDs to discover companion markets rather than guessing every possible slug suffix.

Workflows with Polymarket Gamma API

Build a catalog

Page through open events, retain stable IDs and slugs and map each market to its outcome tokens. Refresh status separately from live price data.

Link a sports feed

Resolve the game and team ordering, then use its game ID to discover related props and additional lines.

Open a pasted link

Resolve the event or market by URL or slug and use the returned identifiers for book queries.

Pricing and total cost

Public discovery requires no authentication. The guide does not list a separate subscription for these reads.

Getting started

Before you start: An event can contain several markets; it is not always one YES/NO contract.

Choose events, markets or series according to the level you need.
Start with a small filtered page.
Preserve IDs, slugs, tags and outcome-token mappings.
Use CLOB for executable prices and books after discovery.

Open documentation

Useful links

Community

What to check

An event can contain several markets; it is not always one YES/NO contract.
Market resolution rules and dates belong to the individual contract.
Sports home/away assignments can change after rescheduling.
Pagination is required for a complete catalog.

A closer look

Ratings & reviews

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Editorial rating

4.0/ 5

0 user reviews

Polytoolhub editorial

Our take on Polymarket Gamma API

Public discovery and structured event metadata make this a useful first integration for market catalogs. Complete coverage requires pagination and careful separation of events from individual contracts.

Based on documented features, setup and access terms. How we rate

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Frequently asked questions about Polymarket Gamma API

What is the difference between an event and a market?

An event groups one or more questions; a binary market identifies one YES/NO question.

Does Gamma place orders?

Order placement belongs to CLOB, not the discovery API.

Can I discover related sports markets?

Use the game ID and listing workflow to find the current companion events.

Polymarket Gamma API

Screenshots and interface