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 11 API contracts indexed on the APIs.io network, including WebSocket, CLOB Market Data API, CLOB Trade API, and 8 more. Tagged areas include Prediction Markets, DeFi, Polygon, Order Book, and Cryptocurrency.

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 17 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

38.8/100 thin ▬ flat Agent 23/100 agent aware Front door AI 3/6 light Heartbeat 97/100 alive self hosted · MIT Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreeSelf serve⚡ Free to try

1 published contract

Prediction Markets DeFi Polygon Order Book Cryptocurrency Markets Polymarket Real-Time

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 38.8/100 · thin

Contract Quality 8.9 / 16

Developer Ergonomics 3.4 / 13

Access Clarity 0.7 / 13

Operational Transparency 3.1 / 8

Contract Governance 0.9 / 8

Discoverability 4.8 / 7

Regulatory Posture 2.5 / 15

Open Source Surface 10.0 / 10

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 23/100 · 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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

8 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 5.3 — up to +18.9 composite points
Developer Ergonomics scores 26.2 — up to +14.8 composite points
Contract Quality scores 54.7 — up to +11.3 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/polymarket/apis.yml: open an issue on github.com/api-evangelist/polymarket to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Raycast Store Extensions (first-party publishers + community-wrapped products)	covered	12.1 (thin)	-	-
IFTTT Services (service publishers)	covered	12.1 (thin)	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

AsyncAPI

measured — observed by APIs.io (published)

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 5

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

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

Polymarket API pricing

Not yet checked against Polymarket's own pricing page. Compiled by API Evangelist on 2026-05-22; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Pro Tier Default: 120 requests per minute

Compiled by API Evangelist, not yet checked against Polymarket's documentation. Rate-limit details →

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

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Polymarket

SLA

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 — asyncapi 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 5

Status, limits, changes, and where to get help

RateLimits

IssueTracker

Releases

Support

Status

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

License

License

Company 3

The organization behind the API

BlogRSS

BlogRSS

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
  gated: none
  gated_source:
  - onboarding
  label: Free · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/polymarket.png
x-docs-platform: mintlify
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
x-docs-hosting: vercel
tags:
- Prediction Markets
- DeFi
- Polygon
- Order Book
- Cryptocurrency
- Markets
- Polymarket
- Real-Time
tags_raw:
- Prediction Markets
- DeFi
- Polygon
- Order Book
- Crypto
- Markets
- Polymarket
- Real-Time
created: '2026-05-23'
modified: '2026-10-06'
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: Plans
  url: plans/polymarket-plans-pricing.yml
- type: RateLimits
  url: rate-limits/polymarket-rate-limits.yml
- type: FinOps
  url: finops/polymarket-finops.yml
- url: https://news.polymarket.com/feed
  type: BlogRSS
- 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

Polymarket API — frequently asked questions

Does Polymarket have an API?

Yes. APIs.io lists 11 APIs from Polymarket, including Polymarket CLOB API, Polymarket Gamma API and Polymarket Data API, and 8 more.

Is there an OpenAPI specification for the Polymarket API?

Yes. APIs.io indexes 4 OpenAPI specifications for Polymarket, each linked for download from this page.

How do I authenticate with the Polymarket API?

Polymarket uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as Polymarket Authentication.

How much does the Polymarket API cost?

APIs.io lists 1 pricing plan for Polymarket, with each plan's price, limits and inclusions under Pricing on this page.

Is the Polymarket API ready for AI agents?

Polymarket has a Kin Score of 38.8 out of 100 (thin) and an Agent Readiness score of 23.4 (agent-aware), scored by API Evangelist on 2026-11-06.

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