Sonic - Fastest EVM Layer-1 Documentation

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

  // Sonic's fast finality means confirmations are near-instant
  console.log('Transaction confirmed in block:', receipt.blockNumber);

  return receipt;
}

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

// Get current gas price
const gasPrice = await provider.getGasPrice();

// Total cost in S tokens
const totalCost = gasEstimate * gasPrice;
console.log('Transaction cost:', totalCost, 'S');

// Query events with automatic retry and pagination
async function getEvents(contract, eventName, fromBlock = 0) {
  const filter = contract.filters[eventName]();
  const events = [];
  const batchSize = 10000; // Sonic can handle larger batches

  const currentBlock = await provider.getBlockNumber();

  for (let i = fromBlock; i <= currentBlock; i += batchSize) {
    const batch = await contract.queryFilter(
      filter,
      i,
      Math.min(i + batchSize - 1, currentBlock)
    );
    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 SonicProvider {
  static instance = null;

  static getInstance() {
    if (!this.instance) {
      this.instance = new JsonRpcProvider(
        'https://api-sonic-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);
}

// Check balance before sending transaction
const balance = await provider.getBalance(address);
const gasEstimate = await provider.estimateGas(tx);
const gasPrice = await provider.getGasPrice();
const totalRequired = gasEstimate * gasPrice + tx.value;

if (balance < totalRequired) {
  throw new Error(`Need ${totalRequired - balance} more S tokens`);
}

// 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 1: Check connection
const chainId = await provider.getNetwork();
console.assert(chainId.chainId === 146n, 'Connected to Sonic mainnet');

// Test 2: Query recent block
const block = await provider.getBlock('latest');
console.log('Current block:', block.number);

// Test 3: Check USDC contract
const usdcAddress = '0x29219dd400f2Bf60E5a23d13Be72B486D4038894';
const code = await provider.getCode(usdcAddress);
console.assert(code !== '0x', 'USDC contract exists');

// Before (Fantom)
const provider = new JsonRpcProvider('https://rpc.ftm.tools');

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

// Smart contracts work identically
// Same tooling and libraries
// Note: Different chain ID (146 vs 250)
// Note: New native token (S instead of FTM)
// 1:1 token swap available