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Overview

This tutorial shows how to bridge assets between HyperEVM (Hyperliquid’s EVM layer) and Plasma using the deBridge Liquidity Network (DLN) API. You will build a JavaScript application that creates cross-chain swap orders, executes bridge transactions, and monitors their status. By the end, you will have working code that:
  • Quotes bridge fees and estimated output amounts
  • Executes cross-chain transfers from HyperEVM to Plasma
  • Monitors order status until completion
  • Handles the reverse direction (Plasma to HyperEVM)

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Prerequisites

  • Chainstack account with Plasma and Hyperliquid nodes deployed
  • Node.js 18 or later
  • A wallet with assets on HyperEVM (HYPE, USDT, or other supported tokens)
  • Basic familiarity with ethers.js
deBridge supports both directions: HyperEVM → Plasma and Plasma → HyperEVM. This tutorial covers both.

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Network parameters

NetworkChain IDCurrencyRPC endpoint
HyperEVM Mainnet999HYPEhttps://rpc.hyperliquid.xyz/evm
Plasma Mainnet9745XPLhttps://rpc.plasma.to

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Token addresses

TokenHyperEVMPlasma
NativeHYPE (18 decimals)XPL (18 decimals)
USDTCheck deBridge0xB8CE59FC3717Ada4C02eadf9682A9e934F625ebb
Use your Chainstack endpoints for better reliability and higher rate limits compared to public RPCs.

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1. Set up the project

mkdir hyperevm-plasma-bridge
cd hyperevm-plasma-bridge
npm init -y
npm install ethers dotenv
Create a .env file: 
PRIVATE_KEY=your_wallet_private_key
CHAINSTACK_HYPEREVM_URL=YOUR_CHAINSTACK_HYPERLIQUID_ENDPOINT
CHAINSTACK_PLASMA_URL=YOUR_CHAINSTACK_PLASMA_ENDPOINT
Never commit private keys to version control. Use environment variables or a secrets manager in production.

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2. Initialize the bridge client

Create bridge.js: 
import { ethers } from 'ethers';
import dotenv from 'dotenv';

dotenv.config();

// Standard chain IDs (for RPC connections)
const HYPEREVM_ORIGINAL_CHAIN_ID = 999;
const PLASMA_ORIGINAL_CHAIN_ID = 9745;

// deBridge internal chain IDs (required for API calls)
// IMPORTANT: deBridge uses different IDs than standard chain IDs
// See: https://dln.debridge.finance/v1.0/supported-chains-info
const DEBRIDGE_HYPEREVM_CHAIN_ID = 100000022;
const DEBRIDGE_PLASMA_CHAIN_ID = 100000028;

// deBridge DLN API
const DLN_API_BASE = 'https://dln.debridge.finance/v1.0';

// Native token address (used for native assets like HYPE)
const NATIVE_TOKEN = '0x0000000000000000000000000000000000000000';

// Plasma USDT0 address
const PLASMA_USDT = '0xB8CE59FC3717Ada4C02eadf9682A9e934F625ebb';

// Set up providers
const hyperevmProvider = new ethers.JsonRpcProvider(
  process.env.CHAINSTACK_HYPEREVM_URL || 'https://rpc.hyperliquid.xyz/evm'
);
const plasmaProvider = new ethers.JsonRpcProvider(
  process.env.CHAINSTACK_PLASMA_URL || 'https://rpc.plasma.to'
);

// Create wallet for source chain
const wallet = new ethers.Wallet(process.env.PRIVATE_KEY, hyperevmProvider);

console.log('Wallet address:', wallet.address);

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3. Get a bridge quote

Add the quote function to fetch estimated amounts and fees: 
async function getBridgeQuote({
  srcChainId,
  dstChainId,
  srcTokenAddress,
  dstTokenAddress,
  amount,
  recipient,
}) {
  const params = new URLSearchParams({
    srcChainId: srcChainId.toString(),
    srcChainTokenIn: srcTokenAddress,
    srcChainTokenInAmount: amount,
    dstChainId: dstChainId.toString(),
    dstChainTokenOut: dstTokenAddress,
    dstChainTokenOutAmount: 'auto',
    dstChainTokenOutRecipient: recipient,
    srcChainOrderAuthorityAddress: recipient,
    dstChainOrderAuthorityAddress: recipient,
  });

  const url = `${DLN_API_BASE}/dln/order/create-tx?${params}`;
  console.log('\nFetching quote from deBridge...');

  const response = await fetch(url);
  if (!response.ok) {
    const error = await response.text();
    throw new Error(`Quote failed: ${error}`);
  }

  const data = await response.json();
  return data;
}

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4. Execute the bridge transaction

Add functions to handle token approval and transaction execution: 
const ERC20_ABI = [
  'function approve(address spender, uint256 amount) returns (bool)',
  'function allowance(address owner, address spender) view returns (uint256)',
  'function balanceOf(address account) view returns (uint256)',
  'function decimals() view returns (uint8)',
];

async function approveToken(tokenAddress, spender, amount, signer) {
  // Skip approval for native token
  if (tokenAddress === NATIVE_TOKEN) {
    console.log('Native token - no approval needed');
    return;
  }

  const contract = new ethers.Contract(tokenAddress, ERC20_ABI, signer);

  // Check existing allowance
  const allowance = await contract.allowance(signer.address, spender);
  if (allowance >= BigInt(amount)) {
    console.log('Sufficient allowance exists');
    return;
  }

  // Approve spending
  console.log('Approving token spend...');
  const tx = await contract.approve(spender, amount);
  const receipt = await tx.wait();
  console.log('Approval confirmed in block:', receipt.blockNumber);
}

async function executeBridge({
  srcChainId,
  dstChainId,
  srcTokenAddress,
  dstTokenAddress,
  amount,
  signer,
}) {
  const recipient = signer.address;

  // Get quote with transaction data
  const quote = await getBridgeQuote({
    srcChainId,
    dstChainId,
    srcTokenAddress,
    dstTokenAddress,
    amount,
    recipient,
  });

  if (!quote.tx) {
    throw new Error('No transaction data in response. Check parameters.');
  }

  // Log estimation details
  const estimation = quote.estimation;
  console.log('\n--- Bridge Quote ---');
  console.log('Input:', estimation.srcChainTokenIn.amount, estimation.srcChainTokenIn.symbol);
  console.log('Output:', estimation.dstChainTokenOut.amount, estimation.dstChainTokenOut.symbol);
  console.log('Recommended slippage:', estimation.recommendedSlippage, '%');
  console.log('Execution fee:', estimation.executionFee?.amount || 'included');

  // Calculate and validate price impact
  const inputUsd = estimation.srcChainTokenIn.approximateUsdValue || 0;
  const outputUsd = estimation.dstChainTokenOut.approximateUsdValue || 0;
  if (inputUsd > 0 && outputUsd > 0) {
    const priceImpact = ((inputUsd - outputUsd) / inputUsd) * 100;
    console.log('Price impact:', priceImpact.toFixed(2), '%');

    // Warn if price impact exceeds 5%
    if (priceImpact > 5) {
      console.warn('⚠️  WARNING: High price impact detected! Consider smaller amount.');
    }

    // Abort if price impact exceeds 10%
    if (priceImpact > 10) {
      throw new Error(`Price impact too high (${priceImpact.toFixed(2)}%). Aborting to prevent losses.`);
    }
  }

  // Approve token if ERC20
  await approveToken(
    srcTokenAddress,
    quote.tx.to,
    estimation.srcChainTokenIn.amount,
    signer
  );

  // Execute bridge transaction
  console.log('\nSending bridge transaction...');
  const tx = await signer.sendTransaction({
    to: quote.tx.to,
    data: quote.tx.data,
    value: quote.tx.value || '0',
    gasLimit: 500000,
  });

  console.log('Transaction hash:', tx.hash);
  console.log('Waiting for confirmation...');

  const receipt = await tx.wait();
  console.log('Confirmed in block:', receipt.blockNumber);

  return {
    txHash: tx.hash,
    orderId: extractOrderId(receipt),
    quote,
  };
}

function extractOrderId(receipt) {
  // The order ID can be found in the transaction logs
  // For simplicity, we'll use the tx hash for tracking
  return receipt.hash;
}

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5. Monitor order status

Add status tracking to monitor the cross-chain transfer: 
async function getOrderStatus(txHash, srcChainId) {
  const url = `https://stats-api.dln.trade/api/Order/filteredList?fromAddress=${wallet.address}`;

  try {
    const response = await fetch(url);
    const data = await response.json();

    // Find our order
    const order = data.orders?.find(
      (o) => o.createTx?.toLowerCase() === txHash.toLowerCase()
    );

    if (order) {
      return {
        status: order.status,
        orderId: order.orderId,
        srcChainId: order.srcChainId,
        dstChainId: order.dstChainId,
        fulfilled: ['Fulfilled', 'SentUnlock', 'ClaimedUnlock'].includes(order.status),
      };
    }

    return null;
  } catch (error) {
    console.error('Status check failed:', error.message);
    return null;
  }
}

async function waitForCompletion(txHash, srcChainId, maxWaitMs = 300000) {
  console.log('\nMonitoring cross-chain transfer...');
  const startTime = Date.now();
  const pollInterval = 10000; // 10 seconds

  while (Date.now() - startTime < maxWaitMs) {
    const status = await getOrderStatus(txHash, srcChainId);

    if (status) {
      console.log(`Status: ${status.status}`);

      if (status.fulfilled) {
        console.log('✓ Bridge transfer completed!');
        return status;
      }
    } else {
      console.log('Order not yet indexed, waiting...');
    }

    await new Promise((resolve) => setTimeout(resolve, pollInterval));
  }

  throw new Error('Bridge transfer timed out');
}

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6. Bridge from HyperEVM to Plasma

Add the main bridging function: 
async function bridgeHyperEVMToPlasma(tokenIn, tokenOut, amount) {
  console.log('\n=== Bridging from HyperEVM to Plasma ===');

  // Check balance
  const balance = await hyperevmProvider.getBalance(wallet.address);
  console.log('HYPE balance:', ethers.formatEther(balance));

  // Validate sufficient balance
  if (BigInt(amount) > balance) {
    throw new Error(`Insufficient balance. Have: ${ethers.formatEther(balance)}, need: ${ethers.formatEther(amount)}`);
  }

  try {
    const result = await executeBridge({
      srcChainId: DEBRIDGE_HYPEREVM_CHAIN_ID,  // Use deBridge internal ID
      dstChainId: DEBRIDGE_PLASMA_CHAIN_ID,    // Use deBridge internal ID
      srcTokenAddress: tokenIn,
      dstTokenAddress: tokenOut,
      amount: amount,
      signer: wallet,
    });

    // Wait for completion
    await waitForCompletion(result.txHash, DEBRIDGE_HYPEREVM_CHAIN_ID);

    return result;
  } catch (error) {
    console.error('Bridge failed:', error.message);
    throw error;
  }
}

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7. Bridge from Plasma to HyperEVM

Add the reverse direction: 
async function bridgePlasmaToHyperEVM(tokenIn, tokenOut, amount) {
  console.log('\n=== Bridging from Plasma to HyperEVM ===');

  // Create wallet connected to Plasma
  const plasmaWallet = new ethers.Wallet(process.env.PRIVATE_KEY, plasmaProvider);

  // Check balance
  const balance = await plasmaProvider.getBalance(plasmaWallet.address);
  console.log('XPL balance:', ethers.formatEther(balance));

  // Validate sufficient balance
  if (BigInt(amount) > balance) {
    throw new Error(`Insufficient balance. Have: ${ethers.formatEther(balance)}, need: ${ethers.formatEther(amount)}`);
  }

  try {
    const result = await executeBridge({
      srcChainId: DEBRIDGE_PLASMA_CHAIN_ID,    // Use deBridge internal ID
      dstChainId: DEBRIDGE_HYPEREVM_CHAIN_ID,  // Use deBridge internal ID
      srcTokenAddress: tokenIn,
      dstTokenAddress: tokenOut,
      amount: amount,
      signer: plasmaWallet,
    });

    // Wait for completion
    await waitForCompletion(result.txHash, DEBRIDGE_PLASMA_CHAIN_ID);

    return result;
  } catch (error) {
    console.error('Bridge failed:', error.message);
    throw error;
  }
}

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8. Run the bridge

Add the main execution and example usage: 
async function main() {
  const args = process.argv.slice(2);
  const direction = args[0] || 'to-plasma';
  const amount = args[1] || '1000000000000000'; // 0.001 in 18 decimals

  console.log('Direction:', direction);
  console.log('Amount:', amount);

  try {
    if (direction === 'to-plasma') {
      // Bridge HYPE from HyperEVM to XPL on Plasma
      await bridgeHyperEVMToPlasma(
        NATIVE_TOKEN, // HYPE (native)
        NATIVE_TOKEN, // XPL (native)
        amount
      );
    } else if (direction === 'to-hyperevm') {
      // Bridge XPL from Plasma to HYPE on HyperEVM
      await bridgePlasmaToHyperEVM(
        NATIVE_TOKEN, // XPL (native)
        NATIVE_TOKEN, // HYPE (native)
        amount
      );
    } else {
      console.log('Usage: node bridge.js [to-plasma|to-hyperevm] [amount]');
      return;
    }

    console.log('\n✓ Bridge completed successfully!');
  } catch (error) {
    console.error('\n✗ Bridge failed:', error.message);
    process.exit(1);
  }
}

main();
Update package.json for ES modules: 
{
  "type": "module"
}

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9. Test the bridge

Run the bridge in either direction: 
# Bridge from HyperEVM to Plasma
node bridge.js to-plasma 1000000000000000

# Bridge from Plasma to HyperEVM
node bridge.js to-hyperevm 1000000000000000
Expected output: 
Wallet address: 0x1234...5678
Direction: to-plasma
Amount: 1000000000000000

=== Bridging from HyperEVM to Plasma ===
HYPE balance: 0.5

Fetching quote from deBridge...

--- Bridge Quote ---
Input: 1000000000000000 HYPE
Output: 980000000000000 XPL
Recommended slippage: 0.5 %
Execution fee: included
Native token - no approval needed

Sending bridge transaction...
Transaction hash: 0xabcd...ef01
Waiting for confirmation...
Confirmed in block: 1234567

Monitoring cross-chain transfer...
Status: Created
Status: Fulfilled
✓ Bridge transfer completed!

✓ Bridge completed successfully!

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Alternative: Using the deBridge UI

For manual transfers without code:
  1. Visit app.debridge.finance
  2. Connect your wallet
  3. Select HyperEVM as source chain
  4. Select Plasma as destination chain
  5. Choose token and amount
  6. Click Swap and confirm

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Troubleshooting

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”Quote failed” error

Check that both chains are supported by deBridge and the token addresses are correct. Use the native token address (0x0000...0000) for HYPE and XPL.

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Transaction stuck

Cross-chain transfers typically complete in 1-5 minutes. If stuck longer:
  1. Check order status at stats-api.dln.trade
  2. Contact deBridge support with your transaction hash

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Insufficient balance

Ensure you have enough:
  • Source tokens for the bridge amount
  • Native tokens for gas (HYPE on HyperEVM, XPL on Plasma)

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Rate limiting

The public RPC endpoints have rate limits:
  • HyperEVM public: 100 requests/minute
  • Plasma public: varies
Use Chainstack endpoints for higher limits and better reliability.

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Supported tokens

deBridge supports bridging various tokens between HyperEVM and Plasma. Check the deBridge app for the current list of supported assets. Common routes:
  • HYPE ↔ XPL (native tokens)
  • USDT on HyperEVM ↔ USDT0 on Plasma
  • ETH variants ↔ wrapped versions

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Conclusion

You now have working code to bridge assets between HyperEVM and Plasma using the deBridge DLN API. The same pattern works for bridging between any chains supported by deBridge. For production applications, consider:
  • Adding comprehensive error handling
  • Implementing retry logic with exponential backoff
  • Setting up monitoring for stuck transactions
  • Using webhooks for status notifications

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Resources

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About the author

8_Bi4fdM_400x400

Ake

Director of Developer Experience @ Chainstack Talk to me all things Web320 years in technology | 8+ years in Web3 full time years experienceTrusted advisor helping developers navigate the complexities of blockchain infrastructure