Ethereum RPC with Dwellir

// Watch for transaction confirmation
async function waitForTransaction(txHash) {
  const receipt = await provider.waitForTransaction(txHash, 1);

  // Check transaction status
  if (receipt.status === 1) {
    console.log('Transaction successful');
  } else {
    console.log('Transaction failed');
  }

  return receipt;
}

// Get current fee data (EIP-1559)
const feeData = await provider.getFeeData();

// Estimate gas for transaction
const gasEstimate = await provider.estimateGas(tx);

// Calculate total cost
const totalCost = gasEstimate * feeData.gasPrice;
console.log('Estimated cost:', totalCost);

// Query events with automatic retry and pagination
async function getEvents(contract, eventName, fromBlock = 0) {
  const filter = contract.filters[eventName]();
  const events = [];
  const batchSize = 2000; // Recommended batch size
  const latestBlock = await provider.getBlockNumber();

  for (let i = fromBlock; i <= latestBlock; i += batchSize) {
    const toBlock = Math.min(i + batchSize - 1, latestBlock);
    const batch = await contract.queryFilter(filter, i, toBlock);
    events.push(...batch);
  }

  return events;
}

const batch = [
  { method: 'eth_blockNumber', params: [] },
  { method: 'eth_gasPrice', params: [] },
  { method: 'eth_getBalance', params: [address, 'latest'] }
];

const results = await provider.send(batch);

// Singleton pattern for provider
class EthereumProvider {
  static instance = null;

  static getInstance() {
    if (!this.instance) {
      this.instance = new JsonRpcProvider(
        'https://api-ethereum-mainnet.n.dwellir.com/YOUR_API_KEY'
      );
    }
    return this.instance;
  }
}

const cache = new Map();

async function getCachedBlockData(blockNumber) {
  const key = `block_${blockNumber}`;

  if (!cache.has(key)) {
    const block = await provider.getBlock(blockNumber);
    cache.set(key, block);
  }

  return cache.get(key);
}

// Always account for gas in balance checks
const balance = await provider.getBalance(address);
const gasPrice = await provider.getGasPrice();
const gasLimit = await provider.estimateGas(tx);
const gasCost = gasPrice * gasLimit;

if (balance < (tx.value + gasCost)) {
  throw new Error(`Need ${(tx.value + gasCost) - balance} more wei`);
}

// Get current fee data
const feeData = await provider.getFeeData();

const tx = {
  to: recipient,
  value: amount,
  maxFeePerGas: feeData.maxFeePerGas,
  maxPriorityFeePerGas: feeData.maxPriorityFeePerGas,
  gasLimit: 21000n
};

async function callWithRetry(fn, maxRetries = 3) {
  for (let i = 0; i < maxRetries; i++) {
    try {
      return await fn();
    } catch (error) {
      if (error.code === 429 && i < maxRetries - 1) {
        await new Promise(r => setTimeout(r, 2 ** i * 1000));
      } else {
        throw error;
      }
    }
  }
}

# Test Ethereum mainnet
curl -X POST https://api-ethereum-mainnet.n.dwellir.com/YOUR_API_KEY \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}'

# Test Ethereum Sepolia
curl -X POST https://api-ethereum-sepolia.n.dwellir.com/YOUR_API_KEY \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}'

// Test mainnet connection
const mainnetProvider = new JsonRpcProvider(
  'https://api-ethereum-mainnet.n.dwellir.com/YOUR_API_KEY'
);

const blockNumber = await mainnetProvider.getBlockNumber();
const network = await mainnetProvider.getNetwork();

console.log('Block number:', blockNumber);
console.log('Chain ID:', network.chainId); // Should be 1n

from web3 import Web3

# Test connection
web3 = Web3(Web3.HTTPProvider(
  'https://api-ethereum-mainnet.n.dwellir.com/YOUR_API_KEY'
))

print('Connected:', web3.is_connected())
print('Chain ID:', web3.eth.chain_id)  # Should be 1
print('Block number:', web3.eth.block_number)

// Before
const provider = new JsonRpcProvider('https://other-provider.com');

// After
const provider = new JsonRpcProvider(
  'https://api-ethereum-mainnet.n.dwellir.com/YOUR_API_KEY'
);

// All existing code works identically
// Same JSON-RPC methods supported
// Same response formats
// Note: Update your API endpoint URL
// Note: Add your Dwellir API key