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Installation

npm install @kalshi/trading-api

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Quick Start

import { Configuration, PortfolioApi } from '@kalshi/trading-api';

// Configure the SDK
const config = new Configuration({
    apiKey: 'your-api-key-id',
    privateKeyPath: 'path/to/your/private-key.pem', // or use privateKeyPem
    basePath: 'https://api.elections.kalshi.com/trade-api/v2'
});

// Create API instance
const portfolioApi = new PortfolioApi(config);

// Make API calls
const balance = await portfolioApi.getBalance();
console.log(`Balance: $${(balance.data.balance || 0) / 100}`);

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Authentication

The SDK uses RSA-PSS signing for authentication. You can provide your private key either as a file path or as a PEM string: 
// Using file path
const config = new Configuration({
    apiKey: 'your-api-key-id',
    privateKeyPath: 'path/to/private-key.pem',
    basePath: 'https://api.elections.kalshi.com/trade-api/v2'
});

// Using PEM string
const config = new Configuration({
    apiKey: 'your-api-key-id',
    privateKeyPem: '-----BEGIN RSA PRIVATE KEY-----\n...\n-----END RSA PRIVATE KEY-----',
    basePath: 'https://api.elections.kalshi.com/trade-api/v2'
});

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Source Code