The ccxt for prediction markets. Hosted unified API for prediction markets — trade Polymarket, Kalshi, Opinion, and more from one API key. Open-source SDK and self-host option included.

Discord

Polymarket Polymarket Polymarket US Polymarket US 🇺🇸 Kalshi Kalshi Limitless Limitless Probable Myriad Myriad Opinion Opinion Metaculus Metaculus Smarkets Smarkets Hyperliquid Hyperliquid Gemini Titan Gemini Titan Rain Rain

Feature Support & Compliance.

Different prediction market platforms have different APIs, data formats, and conventions. pmxt provides a single, consistent interface to work with all of them.

• Hosted API. Get a key at pmxt.dev/dashboard, construct a client, trade. PMXT handles custody, signing infrastructure, and on-chain settlement.
• Open source (MIT). Self-host the local server for full control — your keys, your machine, no PMXT in the loop. See Self-hosted.
• Language-agnostic. Python and TypeScript SDKs today, with HTTP access for any other language. No lock-in to a single ecosystem.
• Drop-in Dome API replacement. Automatic codemod (dome-to-pmxt) for teams migrating after the Polymarket acquisition.
• Unified trading, not just data. Place orders across Polymarket, Kalshi, and Limitless with a single interface.
• MCP-native. Use pmxt directly from Claude, Cursor, and other AI agents.

Ensure that Node.js (>= 18) is installed and the node command is available on your PATH. The Python SDK requires Python >= 3.8.

pip install pmxt

npm install pmxtjs

npm install -g @pmxt/cli
pmxt polymarket markets --query Trump --limit 5
pmxt polymarket fetchMarkets --query Trump --limit 5
pmxt auth status

git clone https://github.com/pmxt-dev/pmxt.git
cd pmxt
npm install
npm run dev

npx -y @pmxt/mcp

See @pmxt/mcp for setup with Claude, Cursor, and other MCP-compatible clients.

If you're currently using Dome API, pmxt is a drop-in replacement with a unified interface for Polymarket and Kalshi.

Check out pmxt as a Dome API alternative for a detailed migration guide, API comparison, and automatic codemod tool (dome-to-pmxt) to help you transition your code.

# Automatically migrate your codebase
npx dome-to-pmxt ./src

Get your API key at pmxt.dev/dashboard. For reads, only pmxt_api_key and wallet_address are required. For trading, also pass private_key — the SDK auto-wraps it into an EIP-712 signer.

import pmxt
# Reads — pmxt_api_key + wallet_address only
client = pmxt.Polymarket(
 pmxt_api_key="pmxt_live_...",
 wallet_address="0xYourWalletAddress",
)
positions = client.fetch_positions()
balance = client.fetch_balance()
markets = client.fetch_markets(query="nba")
# Trading — also pass private_key
trader = pmxt.Polymarket(
 pmxt_api_key="pmxt_live_...",
 wallet_address="0xYourWalletAddress",
 private_key="0xYourPrivateKey",
)
order = trader.create_order(
 market_id="market-uuid",
 outcome_id="outcome-uuid",
 side="buy",
 order_type="market",
 amount=5.0,
 denom="usdc",
 slippage_pct=30.0,
)

Note: Named imports do not work in ESM. Use import pmxt from 'pmxtjs' (default import) for the namespaced form, or import Polymarket from pmxtjs only via the CJS build.

import { Polymarket } from "pmxtjs";
// Reads — pmxtApiKey + walletAddress only
const client = new Polymarket({
 pmxtApiKey: "pmxt_live_...",
 walletAddress: "0xYourWalletAddress",
});
const positions = await client.fetchPositions();
const balance = await client.fetchBalance();
// Trading — also pass privateKey
const trader = new Polymarket({
 pmxtApiKey: "pmxt_live_...",
 walletAddress: "0xYourWalletAddress",
 privateKey: "0xYourPrivateKey",
});
const order = await trader.createOrder({
 marketId: "market-uuid",
 outcomeId: "outcome-uuid",
 side: "buy",
 type: "market",
 amount: 5.0,
 denom: "usdc",
 slippage_pct: 30.0,
} as any);

Prediction markets are structured in a hierarchy to group related information.

• Event: The broad topic (e.g., "Who will Trump nominate as Fed Chair?")
• Market: A specific tradeable question (e.g., "Will Trump nominate Kevin Warsh as the next Fed Chair?")
• Outcome: The actual share you buy (e.g., "Yes" or "No")

pmxt supports unified trading across exchanges. The hosted API is the default — see Quickstart above for the basic flow.

With a PMXT API key, you only need your wallet address and a private key to sign orders. PMXT handles custody, signer infrastructure, and on-chain settlement.

import pmxt
trader = pmxt.Polymarket(
 pmxt_api_key="pmxt_live_...",
 wallet_address="0xYourWalletAddress",
 private_key="0xYourPrivateKey",
)
# 1. Check balance
balance = trader.fetch_balance()
print(f"Available balance: {balance[0].available}")
# 2. Fetch markets
markets = trader.fetch_markets(query='Trump')
# 3. Place an order
order = trader.create_order(
 market_id=markets[0].market_id,
 outcome_id=markets[0].yes.outcome_id,
 side='buy',
 order_type='market',
 amount=5.0,
 denom='usdc',
 slippage_pct=30.0,
)
print(f"Order status: {order.status}")

Use this when you self-host the local server. See Self-hosted for setup. You provide venue credentials directly — no pmxt_api_key required. For detailed credential setup instructions, see the exchange-specific guides: Polymarket, Kalshi, Limitless.

exchange = pmxt.Polymarket(
 private_key=os.getenv('POLYMARKET_PRIVATE_KEY'),
 proxy_address=os.getenv('POLYMARKET_PROXY_ADDRESS'), # Optional: For proxy trading
 signature_type='gnosis-safe' # Default
)

 exchange = pmxt.Kalshi(
 api_key=os.getenv('KALSHI_API_KEY'),
 private_key=os.getenv('KALSHI_PRIVATE_KEY') # RSA Private Key
)

exchange = pmxt.Limitless(
 api_key=os.getenv('LIMITLESS_API_KEY'),
 private_key=os.getenv('LIMITLESS_PRIVATE_KEY') # For order signing (EIP-712)
)

To self-host pmxt-core on your own machine: pip install pmxt-core (Python) or npm install pmxt-core (Node.js), then construct any venue client without pmxt_api_key. The SDK spawns a local PMXT service; you supply venue credentials directly. See the self-hosted guide for details.

See the API Reference for detailed documentation and more examples.

Check out the directory for more use cases:

TypeScript Python

Stargazers repo roster for @pmxt-dev/pmxt