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polymarket-knowledge

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Polymarket CLOB API knowledge base for order management, WebSocket events, and trading operations. Use when working with order lifecycle (place, fill, cancel), debugging WebSocket USER_TRADE/USER_ORDER events, understanding API field mappings, or implementing trading logic.

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How to use this skill

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Source SKILL.md: https://github.com/cyl19970726/poly-sdk/blob/HEAD/.claude/skills/polymarket-knowledge/SKILL.md

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Polymarket Knowledge

Overview

Comprehensive reference for Polymarket CLOB API integration, focusing on order management and real-time event handling.

Quick Reference

Order Types

TypeBehaviorUse Case
GTCGood Till CancelledMaker orders, liquidity provision
GTDGood Till DateTime-limited orders
FOKFill Or KillMust fill completely or cancel
FAKFill And KillFill what you can, cancel rest

Order Requirements

  • Minimum order value: $1 USDC
  • Minimum shares: 5
  • Tick size: 0.01 (prices must be 0.01, 0.02, ... 0.99)

Order State Machine

See references/order-state-machine.md for complete state diagram and transitions.

States: PENDING → OPEN → PARTIALLY_FILLED → FILLED/CANCELLED/EXPIRED

API Status Mapping:

  • live → OPEN
  • matched (partial) → PARTIALLY_FILLED
  • matched (full) → FILLED
  • delayed → PENDING
  • cancelled → CANCELLED
  • expired → EXPIRED

WebSocket Events

See references/websocket-events.md for field mappings and examples.

Key Endpoints:

  • Market: wss://ws-subscriptions-clob.polymarket.com/ws/market
  • User: wss://ws-subscriptions-clob.polymarket.com/ws/user (authenticated)

USER_ORDER Event Types: PLACEMENT, UPDATE, CANCELLATION USER_TRADE Statuses: MATCHED, MINED, CONFIRMED, RETRYING, FAILED

Common Pitfalls

  1. Wrong field names: API uses matched_amount not matched_size, size_matched not matched_size
  2. Wrong endpoint: USER events require /ws/user, not /ws/market
  3. USDC type: Polymarket uses USDC.e (bridged), not native USDC

Resources