# Polymarket

**Canonical:** https://apis.io/providers/polymarket/  
**Website:** https://polymarket.com/  
**APIs profiled:** 11

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.

## Kin Score — 38.6 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 38.6).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 61.6 |
| Governance | 11.4 |
| Contract Governance | 11.4 |
| Operational Transparency | 26.3 |
| Developer Ergonomics | 26.2 |
| Commercial Clarity | 28.9 |
| Access Clarity | 28.9 |

Regulatory layer — **Securities & Market Data**: 30.0 (matched via tags).

## Agent readiness — 30.3 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | derived |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Free · Self-serve signup — onboarding: self-serve, pricing: free, trial: no (confidence: high).

## APIs (11)

- **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.

## Agentic access (1)

- **Polymarket Agentic Access** — 5 operations · 1 acting

## Security (2)

- **Polymarket Authentication** — apiKey · 1 scheme
- **Polymarket Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC

## Plans (1)

- **Polymarket Plans Pricing**

## Tags

Prediction Markets, DeFi, Polygon, Order Book, Crypto, Markets

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/polymarket/). Scores are computed from the provider's own public artifacts under a published rubric.