Polymarket

Polymarket is a decentralized prediction-market platform built on Polygon where users buy and sell binary outcome shares in real-world events. Settlement is on-chain via the UMA optimistic oracle, while order matching runs through a hybrid central-limit order book (CLOB). Developer surface includes the CLOB API for order placement and market data, the Gamma API for market and event metadata, a Data API for historical and analytical reads, a WebSocket stream, and official CLOB client SDKs in TypeScript, Python, and Rust.

Polymarket publishes 5 APIs on the APIs.io network, including WebSocket, CLOB Market Data API, CLOB Trade API, and 2 more. Tagged areas include Prediction Markets, DeFi, Polygon, Order Book, and Crypto.

The Polymarket catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

Polymarket’s developer surface includes authentication, documentation, GitHub presence, support, status page, and 13 more developer resources.

🌐 Visit website 📡 Source on GitHub

46.0/100 developing ▬ flat Agent 21/100 agent aware self hosted · MIT Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreeSelf serve⚡ Free to try

1 APIs

Prediction Markets DeFi Polygon Order Book Crypto Markets

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 46.0/100 · developing

Contract Quality 9.7 / 16

Developer Ergonomics 3.4 / 13

Access Clarity 3.8 / 13

Operational Transparency 4.4 / 8

Contract Governance 0.9 / 8

Discoverability 4.9 / 7

Regulatory Posture 4.5 / 15

Open Source Surface 10.0 / 10

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 21/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Securities & Market Data regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 65 points between them, because both conditional facets apply and carry 35 points together. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 65% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/polymarket: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 11

Individual APIs this provider publishes, each with its own machine-readable definition.

Polymarket CLOB API

Central-limit order book REST API for Polymarket - place, cancel, and query orders, list markets and tokens, fetch order books and trades, and look up user positions. Used by tr...

Polymarket Gamma API

Read-only metadata API for markets, events, tags, and categories - the surface that powers polymarket.com's listings and search. Useful for discovery and for stitching multiple ...

Polymarket Data API

Historical and analytical data API exposing trades, prices, volumes, holders, and time-series aggregates across Polymarket markets, intended for research, dashboards, and quanti...

Polymarket WebSocket

Real-time streaming feed for order book updates, trades, and market events on the Polymarket CLOB - used by trading clients to maintain a live view of the book without polling.

py-clob-client (Python SDK)

Official Python SDK for the Polymarket CLOB API - wallet signing, EIP-712 order construction, place / cancel / query, and market data helpers.

clob-client (TypeScript SDK)

Official TypeScript / JavaScript SDK for the Polymarket CLOB API - typed clients, wallet integration (viem), order construction, and market data helpers.

clob-client (Rust SDK)

Official Rust SDK for the Polymarket CLOB API.

Polymarket CLOB Market Data API

Public CLOB market data.

Polymarket CLOB Trade API

Order placement and management on the central-limit order book.

Polymarket Gamma Events API

Read-only event metadata.

Polymarket Gamma Markets API

Read-only market metadata.

Scroll for all 11

Open Collections 6

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Polymarket APIs (CLOB and Gamma) CLOB Market Data API

OPEN COLLECTION

Polymarket APIs (CLOB and Gamma) CLOB Market Data CLOB Trade API

OPEN COLLECTION

Polymarket APIs (CLOB and Gamma) CLOB Market Data Gamma Events API

OPEN COLLECTION

Polymarket APIs (CLOB and Gamma) CLOB Market Data Gamma Markets API

OPEN COLLECTION

Polymarket APIs (CLOB and Gamma)

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Polymarket Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Polymarket Rate Limits

2 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Polymarket Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Polymarket CLOB WebSocket API

Real-time streaming feed for Polymarket's central-limit order book (CLOB). Two channels are exposed: a public market channel that streams order book snapshots, price level updat...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Polymarket API Rules

6 rules · 1 errors 5 warnings

SPECTRAL

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Polymarket Authentication

apiKey · 1 scheme

SECURITY

Polymarket Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Polymarket Agentic Access

5 operations · 1 acting

AGENTIC

Resources

Documentation 3

Reference material describing how the API behaves

ContributionGuide

ContributionGuide

Documentation

Documentation

US Documentation

US Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LlmsText

LlmsText

Build 2

SDKs, sample code, and the tooling you integrate with

CodeOfConduct

CodeOfConduct

GitHub

GitHub

Access & Security 3

Authentication, authorization, and security posture

SecurityPolicy

SecurityPolicy

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 4

Status, limits, changes, and where to get help

IssueTracker

Releases

Support

Status

Commercial 1

Pricing, plans, and the legal terms of use

License

License

Company 2

The organization behind the API

Website

Website

LinkedIn

Other 1

Properties that don't map to a standard resource type

Builders Program

Builders Program

Source (apis.yml)

aid: polymarket
url: https://raw.githubusercontent.com/api-evangelist/polymarket/refs/heads/main/apis.yml
name: Polymarket
kind: company
description: Polymarket is a decentralized prediction-market platform built on Polygon where users buy and sell binary outcome
  shares in real-world events. Settlement is on-chain via the UMA optimistic oracle, while order matching runs through a hybrid
  central-limit order book (CLOB). Developer surface includes the CLOB API for order placement and market data, the Gamma
  API for market and event metadata, a Data API for historical and analytical reads, a WebSocket stream, and official CLOB
  client SDKs in TypeScript, Python, and Rust.
deliveryModel:
  model: self-hosted
  license: MIT
  open_source: true
  commercial: false
  callable_host: true
  label: Self-hosted open source · you run it yourself
  confidence: high
  source:
  - license
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: free
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Free · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/polymarket.png
tags:
- Prediction Markets
- DeFi
- Polygon
- Order Book
- Crypto
- Markets
created: '2026-05-23'
modified: '2026-05-29'
specificationVersion: '0.23'
apis:
- aid: polymarket:clob-api
  name: Polymarket CLOB API
  description: Central-limit order book REST API for Polymarket - place, cancel, and query orders, list markets and tokens,
    fetch order books and trades, and look up user positions. Used by traders and bots interacting with Polymarket's matched
    markets.
  humanURL: https://docs.polymarket.com/
  baseURL: https://clob.polymarket.com
  tags:
  - REST
  - Order
  - Order Book
  - Markets
  tags_raw:
  - REST
  - Orders
  - Order Book
  - Markets
  properties:
  - type: Documentation
    url: https://docs.polymarket.com/
- aid: polymarket:gamma-api
  name: Polymarket Gamma API
  description: Read-only metadata API for markets, events, tags, and categories - the surface that powers polymarket.com's
    listings and search. Useful for discovery and for stitching multiple binary markets into the broader events they belong
    to.
  humanURL: https://docs.polymarket.com/
  baseURL: https://gamma-api.polymarket.com
  tags:
  - REST
  - Markets
  - Event
  - Metadata
  tags_raw:
  - REST
  - Markets
  - Events
  - Metadata
  properties:
  - type: Documentation
    url: https://docs.polymarket.com/
- aid: polymarket:data-api
  name: Polymarket Data API
  description: Historical and analytical data API exposing trades, prices, volumes, holders, and time-series aggregates across
    Polymarket markets, intended for research, dashboards, and quantitative use.
  humanURL: https://docs.polymarket.com/
  baseURL: https://data-api.polymarket.com
  tags:
  - Data
  - Historical
  - Analytics
  properties:
  - type: Documentation
    url: https://docs.polymarket.com/
- aid: polymarket:websocket
  name: Polymarket WebSocket
  description: Real-time streaming feed for order book updates, trades, and market events on the Polymarket CLOB - used by
    trading clients to maintain a live view of the book without polling.
  humanURL: https://docs.polymarket.com/
  baseURL: wss://ws-subscriptions-clob.polymarket.com
  tags:
  - WebSocket
  - Streaming
  - Order Book
  properties:
  - type: Documentation
    url: https://docs.polymarket.com/
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/polymarket/refs/heads/main/asyncapi/polymarket-asyncapi.yml
- aid: polymarket:py-clob-client
  name: py-clob-client (Python SDK)
  description: Official Python SDK for the Polymarket CLOB API - wallet signing, EIP-712 order construction, place / cancel
    / query, and market data helpers.
  humanURL: https://github.com/Polymarket/py-clob-client
  baseURL: https://github.com/Polymarket/py-clob-client
  tags:
  - SDK
  - Python
  - CLOB
  properties:
  - type: Repository
    url: https://github.com/Polymarket/py-clob-client
- aid: polymarket:clob-client-ts
  name: clob-client (TypeScript SDK)
  description: Official TypeScript / JavaScript SDK for the Polymarket CLOB API - typed clients, wallet integration (viem),
    order construction, and market data helpers.
  humanURL: https://github.com/Polymarket/clob-client
  baseURL: https://github.com/Polymarket/clob-client
  tags:
  - SDK
  - TypeScript
  - JavaScript
  - CLOB
  properties:
  - type: Repository
    url: https://github.com/Polymarket/clob-client
- aid: polymarket:clob-client-rust
  name: clob-client (Rust SDK)
  description: Official Rust SDK for the Polymarket CLOB API.
  humanURL: https://github.com/Polymarket/rust-clob-client
  baseURL: https://github.com/Polymarket/rust-clob-client
  tags:
  - SDK
  - Rust
  - CLOB
  properties:
  - type: Repository
    url: https://github.com/Polymarket/rust-clob-client
- aid: polymarket:polymarket-clob-market-data-api
  name: Polymarket CLOB Market Data API
  description: Public CLOB market data.
  humanURL: https://docs.polymarket.com/
  baseURL: https://clob.polymarket.com
  tags:
  - CLOB Market Data
  properties:
  - type: OpenAPI
    url: openapi/polymarket-clob-market-data-api-openapi.yml
- aid: polymarket:polymarket-clob-trade-api
  name: Polymarket CLOB Trade API
  description: Order placement and management on the central-limit order book.
  humanURL: https://docs.polymarket.com/
  baseURL: https://clob.polymarket.com
  tags:
  - CLOB Trade
  properties:
  - type: OpenAPI
    url: openapi/polymarket-clob-trade-api-openapi.yml
- aid: polymarket:polymarket-gamma-events-api
  name: Polymarket Gamma Events API
  description: Read-only event metadata.
  humanURL: https://docs.polymarket.com/
  baseURL: https://clob.polymarket.com
  tags:
  - Gamma Events
  properties:
  - type: OpenAPI
    url: openapi/polymarket-gamma-events-api-openapi.yml
- aid: polymarket:polymarket-gamma-markets-api
  name: Polymarket Gamma Markets API
  description: Read-only market metadata.
  humanURL: https://docs.polymarket.com/
  baseURL: https://clob.polymarket.com
  tags:
  - Gamma Markets
  properties:
  - type: OpenAPI
    url: openapi/polymarket-gamma-markets-api-openapi.yml
common:
- type: IssueTracker
  url: https://github.com/Polymarket/py-clob-client/issues
- type: Releases
  url: https://github.com/Polymarket/py-clob-client/releases
- type: SecurityPolicy
  url: https://github.com/Polymarket/py-clob-client/blob/main/SECURITY.md
- type: CodeOfConduct
  url: https://github.com/Polymarket/py-clob-client/blob/main/.github/CODE_OF_CONDUCT.md
- type: ContributionGuide
  url: https://github.com/Polymarket/py-clob-client/blob/main/.github/CONTRIBUTING.md
- type: License
  name: MIT
  url: https://github.com/Polymarket/py-clob-client/blob/main/LICENSE
- type: AgenticAccess
  url: agentic-access/polymarket-agentic-access.yml
- type: DomainSecurity
  url: security/polymarket-domain-security.yml
- type: Authentication
  url: authentication/polymarket-authentication.yml
- type: Website
  url: https://polymarket.com/
- type: Documentation
  url: https://docs.polymarket.com/
- type: US Documentation
  url: https://docs.polymarket.us/
- type: GitHub
  url: https://github.com/Polymarket
- type: Builders Program
  url: https://builders.polymarket.com/
- type: Support
  url: https://help.polymarket.com/
- type: Status
  url: https://status.polymarket.com/
- type: LinkedIn
  url: https://www.linkedin.com/company/polymarket/
- type: LlmsText
  url: https://docs.polymarket.us/llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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