---
name: web3-polymarket-bb5998ae3da9
description: Polymarket integration for prediction market trading on Polygon. Covers authentication (L1 EIP-712, L2 HMAC-SHA256, builder headers), order placement (GTC/GTD/FOK/FAK, batch, post-only, heartbeat), market data (Gamma API, Data API, orderbook, subgraph), WebSocket streaming (market/user/sports channels), CTF operations (split, merge, redeem, negative risk), bridge (deposits, withdrawals, multi-chain), and gasless relayer transactions. Use when building AI agents, autonomous market makers, prediction market UIs, or any application integrating with Polymarket on Polygon.
compatibility: Requires network access to Polymarket APIs (clob.polymarket.com, gamma-api.polymarket.com) and Polygon RPC
---

# Polymarket Skill

## When to use this skill

Use this skill when the user asks about or needs to build:
- Polymarket API authentication (L1/L2, API keys, HMAC signing)
- Placing or managing orders (limit, market, GTC, GTD, FOK, FAK, batch, cancel)
- Reading orderbook data (prices, spreads, midpoints, depth)
- Market data fetching (events, markets, by slug, by tag, pagination)
- WebSocket subscriptions (market channel, user channel, sports)
- CTF operations (split, merge, redeem positions)
- Negative risk markets (multi-outcome, conversion, augmented neg risk)
- Bridge operations (deposits, withdrawals, multi-chain)
- Gasless transactions (relayer client, order attribution)
- Builder program integration (order attribution, API keys, tiers)
- Polymarket SDK usage (TypeScript @polymarket/clob-client, Python py-clob-client)

## API Configuration

| API | Base URL | Auth | Purpose |
|-----|----------|------|---------|
| CLOB | `https://clob.polymarket.com` | L2 for trade endpoints | Orderbook, prices, order submission |
| Gamma / Data | `https://gamma-api.polymarket.com` | None | Events, markets, search |
| Data API | `https://data-api.polymarket.com` | None | Trades, positions, user data |
| WebSocket (Market) | `wss://ws-subscriptions-clob.polymarket.com/ws/market` | None | Real-time orderbook |
| WebSocket (User) | `wss://ws-subscriptions-clob.polymarket.com/ws/user` | API creds in message | Trade/order updates |
| WebSocket (Sports) | `wss://sports-api.polymarket.com/ws` | None | Live scores |
| Relayer | `https://relayer-v2.polymarket.com/` | Builder headers | Gasless transactions |
| Bridge | `https://bridge.polymarket.com` | None | Deposits/withdrawals |

## Contract Addresses (Polygon)

| Contract | Address |
|----------|---------|
| USDC (USDC.e) | `0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174` |
| CTF (Conditional Tokens) | `0x4D97DCd97eC945f40cF65F87097ACe5EA0476045` |
| CTF Exchange | `0x4bFb41d5B3570DeFd03C39a9A4D8dE6Bd8B8982E` |
| Neg Risk CTF Exchange | `0xC5d563A36AE78145C45a50134d48A1215220f80a` |
| Neg Risk Adapter | `0xd91E80cF2E7be2e162c6513ceD06f1dD0dA35296` |

## Client Setup

### TypeScript
```typescript
import { ClobClient, Side, OrderType } from "@polymarket/clob-client";
import { Wallet } from "ethers"; // v5.8.0

const HOST = "https://clob.polymarket.com";
const CHAIN_ID = 137;
const signer = new Wallet(process.env.PRIVATE_KEY);

// Step 1: L1 — derive API credentials
const tempClient = new ClobClient(HOST, CHAIN_ID, signer);
const apiCreds = await tempClient.createOrDeriveApiKey();

// Step 2: L2 — init trading client
const client = new ClobClient(
  HOST,
  CHAIN_ID,
  signer,
  apiCreds,
  2,                // signatureType: 0=EOA, 1=POLY_PROXY, 2=GNOSIS_SAFE
  "FUNDER_ADDRESS"  // proxy wallet address from polymarket.com/settings
);
```

### Python
```python
from py_clob_client.client import ClobClient
import os

host = "https://clob.polymarket.com"
chain_id = 137
pk = os.getenv("PRIVATE_KEY")

# Step 1: L1 — derive API credentials
temp_client = ClobClient(host, key=pk, chain_id=chain_id)
api_creds = temp_client.create_or_derive_api_creds()

# Step 2: L2 — init trading client
client = ClobClient(
    host,
    key=pk,
    chain_id=chain_id,
    creds=api_creds,
    signature_type=2,  # 0=EOA, 1=POLY_PROXY, 2=GNOSIS_SAFE
    funder="FUNDER_ADDRESS",
)
```

## Quick Reference: Order Types

| Type | Behavior | Use Case |
|------|----------|----------|
| **GTC** | Rests on book until filled or cancelled | Default limit orders |
| **GTD** | Active until expiration (UTC seconds). Min = `now + 60 + N` | Auto-expire before events |
| **FOK** | Fill entirely immediately or cancel | All-or-nothing market orders |
| **FAK** | Fill what's available, cancel rest | Partial-fill market orders |

- FOK/FAK BUY: `amount` = dollar amount to spend
- FOK/FAK SELL: `amount` = number of shares to sell
- Post-only: GTC/GTD only — rejected if would cross spread

## Quick Reference: Signature Types

| Type | Value | Description |
|------|-------|-------------|
| EOA | `0` | Standard Ethereum wallet (MetaMask). Funder is the EOA address and will need POL for gas. |
| POLY_PROXY | `1` | Custom proxy wallet for Magic Link email/Google users who exported PK from Polymarket.com. |
| GNOSIS_SAFE | `2` | Gnosis Safe multisig proxy wallet (most common). Use for any new or returning user. |

## Core Pattern: Place an Order

### TypeScript
```typescript
const response = await client.createAndPostOrder(
  {
    tokenID: "TOKEN_ID",
    price: 0.50,
    size: 10,
    side: Side.BUY,
  },
  {
    tickSize: "0.01",  // from client.getTickSize(tokenID) or market object
    negRisk: false,    // from client.getNegRisk(tokenID) or market object
  },
  OrderType.GTC
);
console.log(response.orderID, response.status);
```

### Python
```python
from py_clob_client.clob_types import OrderArgs, OrderType
from py_clob_client.order_builder.constants import BUY

response = client.create_and_post_order(
    OrderArgs(token_id="TOKEN_ID", price=0.50, size=10, side=BUY),
    options={"tick_size": "0.01", "neg_risk": False},
    order_type=OrderType.GTC,
)
print(response["orderID"], response["status"])
```

## Core Pattern: Read Orderbook

### TypeScript
```typescript
// No auth needed
const readClient = new ClobClient("https://clob.polymarket.com", 137);
const book = await readClient.getOrderBook("TOKEN_ID");
console.log("Best bid:", book.bids[0], "Best ask:", book.asks[0]);

const mid = await readClient.getMidpoint("TOKEN_ID");
const spread = await readClient.getSpread("TOKEN_ID");
```

### Python
```python
read_client = ClobClient("https://clob.polymarket.com", chain_id=137)
book = read_client.get_order_book("TOKEN_ID")
mid = read_client.get_midpoint("TOKEN_ID")
spread = read_client.get_spread("TOKEN_ID")
```

## Core Pattern: WebSocket Subscribe

```typescript
const ws = new WebSocket("wss://ws-subscriptions-clob.polymarket.com/ws/market");

ws.onopen = () => {
  ws.send(JSON.stringify({
    type: "market",
    assets_ids: ["TOKEN_ID"],
    custom_feature_enabled: true,
  }));
  // Send PING every 10s to keep alive
  setInterval(() => ws.send("PING"), 10_000);
};

ws.onmessage = (event) => {
  if (event.data === "PONG") return;
  const msg = JSON.parse(event.data);
  // msg.event_type: "book" | "price_change" | "last_trade_price" | "tick_size_change" | "best_bid_ask" | "new_market" | "market_resolved"
};
```

## Reference files (load on demand)

Only read these when the task requires deeper detail on a specific topic:

- **Authentication** (L1/L2, builder headers, credential lifecycle): [authentication.md](authentication.md)
- **Order patterns** (GTC/GTD/FOK/FAK, tick sizes, cancel, heartbeat, errors): [order-patterns.md](order-patterns.md)
- **Market data** (Gamma API, Data API, CLOB orderbook, subgraph): [market-data.md](market-data.md)
- **WebSocket** (market/user/sports channels, subscribe, heartbeat): [websocket.md](websocket.md)
- **CTF operations** (split, merge, redeem, neg risk, token IDs): [ctf-operations.md](ctf-operations.md)
- **Bridge** (deposits, withdrawals, supported chains/tokens, status): [bridge.md](bridge.md)
- **Gasless transactions** (relayer client, wallet deployment, builder setup): [gasless.md](gasless.md)


---
Source attribution: Polymarket
Original project: https://github.com/Polymarket/agent-skills
License: MIT
License information: https://opensource.org/license/mit
Original upstream instructions; downloaded from Mega AI Hub.

## Upstream license notice

MIT License

Copyright (c) 2026 Gabriel Moreira

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.



# Mega AI Hub resource metadata

Creator / publisher: Polymarket
Original project: https://github.com/Polymarket/agent-skills
Attribution basis: Upstream repository explicitly recorded in package mirror path

Fields of work: Data & Analytics, Development & Engineering, Marketing
Roles: Backend Developer, Data Analyst, Growth Marketer, ML / AI Engineer, Product Marketer
Specialties: API, Backend
Tools: Polygon, Polymarket
Country applicability: Country not specified
Classification basis: Source catalog labels
Instruction SHA-256: 9ed5099e3c0d682bd2decfdeef3856957fdbe967533629c7f623fbd36cd43435