Hyperliquid API SDK

Typescript SDK to more easily interact with Hyperliquid's API

All info on the Hyperliquid API can be found here: HyperLiquid API Documentation

Features

• Complete API coverage for both REST and WebSocket endpoints
• TypeScript support with comprehensive type definitions
• Browser and Node.js compatibility
• Automatic handling of trailing zeros in price and size fields
• Rate limiting support
• Comprehensive error handling

Installation

Choose your preferred installation method:

Package Managers

# npm
npm i --save hyperliquid

# yarn
yarn add hyperliquid

# pnpm
pnpm add hyperliquid

# bun
bun i hyperliquid

Node.js Version Requirements for WebSocket Functionality

This SDK uses native WebSocket implementation which requires Node.js version 22 or higher. If you're using an earlier version of Node.js, you'll need to install the ws package to use the WebSocket functionality:

npm install ws

Direct Web Usage

<!-- Global bundle (UMD) - Use this with script tags -->
<script src="https://unpkg.com/hyperliquid/dist/browser.global.js"></script>

<!-- ESM bundle - Use this with ES modules -->
<script type="module">
  import { Hyperliquid } from 'https://unpkg.com/hyperliquid/dist/browser.js';
</script>

The SDK provides two browser bundles:

• browser.global.js: UMD bundle that exposes the SDK globally as HyperliquidSDK. Use this with regular <script> tags.
• browser.js: ESM bundle for use with ES modules (import/export syntax).

For Browser usage, see Browser Usage Guide.

Usage

API Agent Wallet Usage: If you are using API Agent wallets everything works as normal but you need to add your actual account's wallet address in the Hyperliquid object field 'walletAddress'.

If you don't do this you will be unable to use some of the SDK methods successfully. If you are using your own Private Key then it's not necessary as the SDK can derive your wallet address from the Private key.

const { Hyperliquid } = require('hyperliquid');

const sdk = new Hyperliquid({
  enableWs: true, // boolean (OPTIONAL) - Enable/disable WebSocket functionality, defaults to true
  privateKey: <private_key - string>,
  testnet: <testnet - boolean (OPTIONAL)>,
  walletAddress: <walletAddress - string (Required if you are using an API Agent Wallet, otherwise not necessary)>,
  vaultAddress: <vaultAddress - string (OPTIONAL)>,
  maxReconnectAttempts: <number (OPTIONAL)>, // Default is 5, controls WebSocket reconnection attempts
  disableAssetMapRefresh: <boolean (OPTIONAL)>, // Default is false, set to true to disable automatic asset map refresh
  assetMapRefreshIntervalMs: <number (OPTIONAL)> // Default is 60000 (1 minute), controls how often asset maps are refreshed
});

// Use the SDK methods
sdk.info.getAllMids().then(allMids => {
  console.log(allMids);
});

Note: You don't have to provide your private key, but it is required if you want to use the exchange API to place, cancel or modify orders or access your accounts assets. WebSocket functionality is enabled by default but can be disabled by setting enableWs: false in the constructor options.

Key Features

Rate Limiting

The SDK implements Hyperliquid's token bucket rate limiting system:

• 100 tokens maximum capacity
• 10 tokens per second refill rate
• Automatic handling of rate limits with proper backoff

The SDK will automatically wait when rate limits are reached, ensuring your API calls succeed without overwhelming the server.

WebSocket Management

The SDK provides robust WebSocket connection handling:

• Automatic reconnection with exponential backoff
• Ping/pong heartbeat mechanism to detect stale connections
• Subscription limit tracking (maximum 1000 subscriptions per IP)
• Proper cleanup of subscriptions when no longer needed

Secure Nonce Generation

For authenticated requests, the SDK uses a secure nonce generation system:

• Monotonically increasing timestamps
• Handles multiple requests in the same millisecond
• Ensures compliance with Hyperliquid's nonce requirements

Asset Map Refresh Management

The SDK automatically maintains asset maps for symbol conversion between internal names (e.g., BTC-PERP) and exchange names (e.g., BTC). By default, these maps are refreshed every 60 seconds to stay up-to-date with new assets.

For users running multiple SDK instances or experiencing rate limiting issues, you can disable automatic refresh:

const sdk = new Hyperliquid({
  privateKey: 'your-private-key',
  testnet: false,
  enableWs: false,
  disableAssetMapRefresh: true, // Prevents automatic refresh calls
});

// If you need asset maps, refresh manually when needed:
await sdk.refreshAssetMapsNow();

Configuration options:

• disableAssetMapRefresh: true - Completely disables automatic asset map refresh
• assetMapRefreshIntervalMs: 300000 - Sets refresh interval to 5 minutes instead of 1 minute

Runtime control methods:

// Check if refresh is enabled
console.log(sdk.isAssetMapRefreshEnabled());

// Disable refresh at runtime
sdk.disableAssetMapRefresh();

// Enable refresh at runtime
sdk.enableAssetMapRefresh();

// Change refresh interval
sdk.setAssetMapRefreshInterval(300000); // 5 minutes

// Manual refresh
await sdk.refreshAssetMapsNow();

When to disable asset map refresh:

• Running multiple SDK instances from the same IP
• Only using the SDK for order placement/cancellation without symbol conversion
• Experiencing rate limiting issues (HTTP 429 errors)
• Using external price oracles and don't need real-time asset metadata

Symbol Naming Convention

Instead of using native symbols (which can be confusing, like @1, @4, @5 for spot and only the coin name for perps), we've implemented a more intuitive naming system:

• For perpetuals: <coin>-PERP (e.g., BTC-PERP, ETH-PERP)
• For spot: <coin>-SPOT (e.g., PURR-SPOT, BTC-SPOT)

This convention makes it easier to distinguish between spot and perpetual markets.

Examples

Exchange API Methods

// Place an order
sdk.exchange
  .placeOrder({
    coin: 'BTC-PERP',
    is_buy: true,
    sz: 1,
    limit_px: 30000,
    order_type: { limit: { tif: 'Gtc' } },
    reduce_only: false,
    vaultAddress: '0x...', // optional
  })
  .then(placeOrderResult => {
    console.log(placeOrderResult);
  })
  .catch(error => {
    console.error('Error placing order:', error);
  });

// Reserve additional actions for rate limits
// This costs 0.0005 USDC per request instead of trading to increase rate limits
sdk.exchange
  .reserveRequestWeight(1)
  .then(result => {
    console.log('Reserved additional actions:', result);
  })
  .catch(error => {
    console.error('Error reserving actions:', error);
  });

// Multiple orders can be passed as an array or order objects
// The grouping, vaultAddress and builder properties are optional
// Grouping determines how multiple orders are treated by the exchange endpoint in terms
// of transaction priority, execution and dependency. Defaults to 'na' if not specified.
sdk.exchange
  .placeOrder({
    orders: [
      {
        coin: 'BTC-PERP',
        is_buy: true,
        sz: 1,
        limit_px: 30000,
        order_type: { limit: { tif: 'Gtc' } },
        reduce_only: false,
      },
    ],
    vaultAddress: '0x...',
    grouping: 'normalTpsl',
    builder: {
      address: '0x...',
      fee: 999,
    },
  })
  .then(placeOrderResult => {
    console.log(placeOrderResult);
  })
  .catch(error => {
    console.error('Error placing order:', error);
  });

// Cancel an order
sdk.exchange
  .cancelOrder({
    coin: 'BTC-PERP',
    o: 123456, // order ID
  })
  .then(cancelOrderResult => {
    console.log(cancelOrderResult);
  })
  .catch(error => {
    console.error('Error cancelling order:', error);
  });

// Transfer between perpetual and spot accounts
sdk.exchange
  .transferBetweenSpotAndPerp(100, true) // Transfer 100 USDC from spot to perp
  .then(transferResult => {
    console.log(transferResult);
  })
  .catch(error => {
    console.error('Error transferring funds:', error);
  });

All methods supported can be found here: Hyperliquid Exchange Endpoint API Documentation

General Info Methods

// Get all mids
sdk.info
  .getAllMids()
  .then(allMids => {
    console.log(allMids);
  })
  .catch(error => {
    console.error('Error getting all mids:', error);
  });

// Get user open orders
sdk.info
  .getUserOpenOrders('user_address_here')
  .then(userOpenOrders => {
    console.log(userOpenOrders);
  })
  .catch(error => {
    console.error('Error getting user open orders:', error);
  });

// Get L2 order book
sdk.info
  .getL2Book('BTC-PERP')
  .then(l2Book => {
    console.log(l2Book);
  })
  .catch(error => {
    console.error('Error getting L2 book:', error);
  });

All methods supported can be found here: Hyperliquid Info Endpoint API Documentation

WebSocket Methods

WebSocket Subscriptions

const { Hyperliquid } = require('hyperliquid');

async function testWebSocketSubscriptions() {
  // Create a new Hyperliquid instance
  // You can pass a privateKey in the options if you need authenticated access
  const sdk = new Hyperliquid({ enableWs: true });

  try {
    // Connect to the WebSocket
    await sdk.connect();
    console.log('Connected to WebSocket');

    // Subscribe to get latest prices for all coins
    sdk.subscriptions.subscribeToAllMids(data => {
      console.log('Received trades data:', data);
    });

    // Get updates anytime the user gets new fills
    sdk.subscriptions.subscribeToUserFills('<wallet_address_here>', data => {
      console.log('Received user fills data:', data);
    });

    // Get updates on 1 minute ETH-PERP candles
    sdk.subscriptions.subscribeToCandle('BTC-PERP', '1m', data => {
      console.log('Received candle data:', data);
    });

    // Keep the script running
    await new Promise(() => {});
  } catch (error) {
    console.error('Error:', error);
  }
}

testWebSocketSubscriptions();

WebSocket POST Requests

The SDK supports sending POST requests via WebSocket instead of HTTP, which provides lower latency and is ideal for high-frequency trading applications. The SDK includes a comprehensive WebSocket POST system with dynamic payload generation for all exchange methods.

Key Features

• Dynamic Payload Generation: All exchange methods can be executed via WebSocket POST with automatic payload generation
• Lower Latency: WebSocket connections provide faster response times compared to HTTP requests
• Unified Interface: Same method signatures as REST API but executed over WebSocket
• Automatic Authentication: Handles signing and nonce generation automatically for authorized requests
• Error Handling: Comprehensive error handling with detailed response information

Basic Usage

const { Hyperliquid } = require('hyperliquid');

async function testWebSocketPostRequests() {
  // Create a new Hyperliquid instance with WebSocket enabled
  const sdk = new Hyperliquid({
    enableWs: true,
    privateKey: 'your_private_key', // Required for exchange methods
    testnet: false, // Set to true for testnet
  });

  try {
    // Connect to the WebSocket
    await sdk.connect();
    console.log('Connected to WebSocket');

    // Wait for connection to be fully established
    await new Promise(resolve => setTimeout(resolve, 1000));

    // Example 1: Place Order via WebSocket POST
    const orderResponse = await sdk.wsPayloads.placeOrder({
      coin: 'BTC-PERP',
      is_buy: true,
      sz: '0.001',
      limit_px: '50000', // Far from market price for safety
      order_type: { limit: { tif: 'Gtc' } },
      reduce_only: false,
    });
    console.log('Place Order Response:', orderResponse);

    // Example 2: Cancel All Orders via WebSocket POST
    const cancelAllResponse = await sdk.wsPayloads.cancelAllOrders();
    console.log('Cancel All Orders Response:', cancelAllResponse);

    // Example 3: Transfer Between Spot and Perp via WebSocket POST
    const transferResponse = await sdk.wsPayloads.transferBetweenSpotAndPerp(1.0, true);
    console.log('Transfer Response:', transferResponse);
  } catch (error) {
    console.error('Error:', error);
  } finally {
    // Disconnect WebSocket when done
    sdk.disconnect();
  }
}

testWebSocketPostRequests();

Available WebSocket POST Methods

The SDK provides WebSocket POST support for all exchange methods:

Order Management:

• wsPayloads.placeOrder(orderParams) - Place single or multiple orders
• wsPayloads.cancelOrder(cancelParams) - Cancel a specific order
• wsPayloads.cancelAllOrders(symbol?) - Cancel all orders (optionally for a specific symbol)
• wsPayloads.modifyOrder(modifyParams) - Modify an existing order
• wsPayloads.batchModifyOrders(modifyParams[]) - Modify multiple orders

TWAP Orders:

• wsPayloads.placeTwapOrder(twapParams) - Place a TWAP order
• wsPayloads.cancelTwapOrder(twapId) - Cancel a TWAP order

Account Management:

• wsPayloads.updateLeverage(coin, leverageMode, leverage) - Update leverage
• wsPayloads.updateIsolatedMargin(coin, isBuy, ntli) - Update isolated margin

Transfers:

• wsPayloads.transferBetweenSpotAndPerp(amount, toPerp) - Transfer between spot and perp
• wsPayloads.usdTransfer(destination, amount) - Transfer USD to another address
• wsPayloads.spotTransfer(destination, token, amount) - Transfer spot tokens
• wsPayloads.initiateWithdrawal(destination, amount) - Initiate withdrawal
• wsPayloads.vaultTransfer(vaultAddress, isDeposit, usd) - Vault transfers

Advanced Features:

• wsPayloads.approveAgent(agentAddress, agentName?) - Approve trading agent
• wsPayloads.approveBuilderFee(builder, maxFeeRate) - Approve builder fees
• wsPayloads.scheduleCancel(time) - Schedule order cancellation
• wsPayloads.setReferrer(code) - Set referrer code

Advanced Usage with Custom Payloads

For advanced users, you can also generate and execute custom payloads:

// Generate a custom payload
const customPayload = await sdk.wsPayloads.generatePayload('placeOrder', {
  orders: [
    {
      coin: 'ETH-PERP',
      is_buy: true,
      sz: '0.1',
      limit_px: '3000',
      order_type: { limit: { tif: 'Gtc' } },
      reduce_only: false,
    },
  ],
});

// Execute the custom payload
const response = await sdk.wsPayloads.executeCustomMethod('placeOrder', {
  orders: [
    {
      coin: 'ETH-PERP',
      is_buy: true,
      sz: '0.1',
      limit_px: '3000',
      order_type: { limit: { tif: 'Gtc' } },
      reduce_only: false,
    },
  ],
});

Testing and Examples

For comprehensive testing and examples of all WebSocket POST methods, see the WebSocket Exchange Testing Example. This file demonstrates:

• All available WebSocket POST methods
• Proper error handling
• Response parsing
• Real-world usage patterns
• Safety considerations for live trading

⚠️ Important Notes:

• WebSocket POST requests require a private key for authentication
• The WebSocket connection must be fully established before sending requests
• All exchange methods that cost real money include safety warnings in the examples
• Test on testnet first before using on mainnet
• The SDK automatically handles nonce generation, signing, and payload formatting

Automatic Handling of Trailing Zeros

The Hyperliquid API requires that price (p) and size (s) fields do not contain trailing zeros. For example:

• 12345.0 should be 12345
• 0.123450 should be 0.12345

This SDK automatically handles this requirement for you in all relevant methods. When you use methods like placeOrder, modifyOrder, or batchModifyOrders, the SDK will automatically remove trailing zeros from price and size values.

You can also use string values for price and size fields, which will be properly formatted:

// Both of these will work correctly
await sdk.exchange.placeOrder({
  coin: 'BTC-PERP',
  is_buy: true,
  sz: '1.0000', // Will be automatically converted to "1"
  limit_px: '50000.00', // Will be automatically converted to "50000"
  reduce_only: false,
  order_type: { limit: { tif: 'Gtc' } },
});

await sdk.exchange.placeOrder({
  coin: 'BTC-PERP',
  is_buy: true,
  sz: 1, // Numeric values also work
  limit_px: 50000,
  reduce_only: false,
  order_type: { limit: { tif: 'Gtc' } },
});

If you're using the low-level signL1Action function directly, the SDK will also automatically normalize the action object to remove trailing zeros.

Spot Info Methods

//Get spot metadata
sdk.info.spot
  .getSpotMeta()
  .then(spotMeta => {
    console.log(spotMeta);
  })
  .catch(error => {
    console.error('Error getting spot metadata:', error);
  });

// Get spot clearinghouse state
sdk.info.spot
  .getSpotClearinghouseState('user_address_here')
  .then(spotClearinghouseState => {
    console.log(spotClearinghouseState);
  })
  .catch(error => {
    console.error('Error getting spot clearinghouse state:', error);
  });

All methods supported can be found here: Hyperliquid Spot Info Endpoint API Documentation

Perpetuals Info Methods

// Get perpetuals metadata
sdk.info.perpetuals
  .getMeta()
  .then(perpsMeta => {
    console.log(perpsMeta);
  })
  .catch(error => {
    console.error('Error getting perpetuals metadata:', error);
  });

// Get user's perpetuals account summary
sdk.info.perpetuals
  .getClearinghouseState('user_address_here')
  .then(clearinghouseState => {
    console.log(clearinghouseState);
  })
  .catch(error => {
    console.error('Error getting clearinghouse state:', error);
  });

All methods supported can be found here: Hyperliquid Perpetuals Info Endpoint API Documentation

Custom Methods

// Cancel all orders
sdk.custom
  .cancelAllOrders()
  .then(cancelAllResult => {
    console.log(cancelAllResult);
  })
  .catch(error => {
    console.error('Error cancelling all orders:', error);
  });

// Cancel all orders for a specific symbol
sdk.custom
  .cancelAllOrders('BTC-PERP')
  .then(cancelAllBTCResult => {
    console.log(cancelAllBTCResult);
  })
  .catch(error => {
    console.error('Error cancelling all BTC-PERP orders:', error);
  });

// Get all tradable assets
const allAssets = sdk.custom.getAllAssets();
console.log(allAssets);

All Custom methods are listed above. These are custom methods that are not part of the official Hyperliquid API. As more are added we will add examples for them here.

WebSocket Subscription Limits

The Hyperliquid API imposes a limit of 1000 WebSocket subscriptions per IP address. The SDK automatically tracks and manages these subscriptions to prevent exceeding this limit. If you attempt to create more than 1000 subscriptions, the SDK will throw an error.

To manage your subscriptions effectively:

• Unsubscribe from feeds you no longer need
• Reuse existing subscriptions where possible
• Monitor your subscription count with sdk.ws.getSubscriptionCount()

Initialization

In most cases the SDK will automatically initialize itself when required. However, in some cases you may need to explicitly initialize the SDK. You can use this method to initialize the SDK:

await sdk.connect();

p.s. You only need to worry about this if the SDK throws you an error telling you that it needs to be initialized.

Star History

Documentation

For more detailed documentation on all available methods and their parameters, please refer to the official Hyperliquid API documentation.

Disclaimer

If you don't have an existing referral and use this SDK then your referral will be set by the SDK. This gives you a 4% discount on fees and gives me a percentage of the fees you pay so that I can keep working on and maintaining the SDK. You get a 4% fee discount & an easy-to-use SDK and in return I get some compensation for maintaining it, win-win

p.s. All referral commissions from this SDK will go towards buying HYPE and other HL-related coins, so it will function as an extension of the assistance fund essentially

Reporting Issues

If you encounter any issues with the SDK, please use the bug report template when creating a new issue on GitHub. This helps us gather all the necessary information to diagnose and fix the problem efficiently.

To report a bug:

1. Go to the Issues tab
2. Click "New Issue"
3. Select the "Bug Report" template
4. Fill in all the requested information, including:
   • Description of the issue
   • Steps to reproduce
   • Expected behavior
   • Actual behavior
   • Environment details (OS, Node.js version, etc.)
   • Any relevant logs or screenshots

Using the bug report template ensures we have all the necessary information to address your issue quickly and effectively.

License

MIT