Harmony RPC Node
Fast & Affordable
Connect to Harmony, the sharded EVM blockchain with 2-second finality. Experience ultra-low fees, high throughput, and seamless cross-chain connectivity.
Connect to Harmony, the sharded EVM blockchain with 2-second finality. Experience ultra-low fees, high throughput, and seamless cross-chain connectivity.
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Network Uptime
Average Response Time
Technical Support
Technical characteristics and available endpoints
Mainnet & Testnet Support
Harmony is a sharded proof-of-stake blockchain delivering 2-second transaction finality through innovative Fast Byzantine Fault Tolerance (FBFT) consensus and 4-shard parallel processing architecture. With transaction fees averaging ~$0.000001 and full EVM compatibility, Harmony enables high-performance DeFi, NFT, and gaming applications. The extensive Horizon Bridge ecosystem connects Harmony to Ethereum, Binance Smart Chain, Bitcoin, and other major chains, creating a cross-chain DeFi hub.
https://rpc.crypto-chief.com/harmony/{YOUR_API_KEY}
wss://rpc.crypto-chief.com/harmony/ws/{YOUR_API_KEY}
Replace {YOUR_API_KEY} with your actual API key from the dashboard.
Access sharded blockchain infrastructure
A Harmony RPC node provides applications with access to a sharded EVM-compatible blockchain achieving 2-second finality and ultra-low fees through innovative sharding and consensus technology. Harmony's unique architecture enables high-performance decentralized applications while maintaining security and decentralization, making it ideal for DeFi protocols, NFT marketplaces, and gaming platforms requiring fast, affordable transactions.
Traditional blockchains take minutes for transaction finality. Even fast chains require 10-15 seconds. Harmony's 2-second finality enables truly responsive user experiences — instant DEX swaps, real-time gaming interactions, and seamless NFT trading. Combined with fees averaging ~$0.000001, Harmony makes high-frequency blockchain interactions economically viable.
Harmony advantages:
Harmony uses state sharding with 4 parallel shards processing transactions simultaneously. Each shard maintains its own state and validators, enabling horizontal scaling impossible on single-chain architectures. Fast Byzantine Fault Tolerance (FBFT) consensus achieves 2-second block times while maintaining security through randomized validator selection and cross-shard communication protocols.
How Harmony sharding works:
Harmony's Horizon Bridge and partner bridges create seamless connectivity to Ethereum, BSC, Bitcoin, and other major blockchains. This positions Harmony as a cross-chain liquidity hub where assets from multiple ecosystems converge for trading, lending, and yield farming. Developers can build applications accessing liquidity across the entire crypto ecosystem.
This cross-chain positioning creates unique opportunities for arbitrage, multi-chain yield strategies, and composable DeFi protocols.
Quick start for developers
Harmony supports all standard Ethereum JSON-RPC methods plus Harmony-specific extensions:
const { ethers } = require('ethers');
const provider = new ethers.JsonRpcProvider('https://rpc.crypto-chief.com/harmony/YOUR_API_KEY');
// Verify connection to Harmony
const network = await provider.getNetwork();
console.log('Chain ID:', network.chainId); // 1666600000
console.log('Network:', network.name); // harmony
// Get ONE balance
const address = '0x...';
const balance = await provider.getBalance(address);
console.log('ONE Balance:', ethers.formatEther(balance));
// Deploy contract with 2-second finality
const factory = new ethers.ContractFactory(abi, bytecode, wallet);
const contract = await factory.deploy();
const receipt = await contract.waitForDeployment();
console.log('Contract deployed in ~2 seconds!');
console.log('Address:', await contract.getAddress());
console.log('Block:', receipt.blockNumber);from web3 import Web3
w3 = Web3(Web3.HTTPProvider('https://rpc.crypto-chief.com/harmony/YOUR_API_KEY'))
print('Connected to Harmony:', w3.is_connected())
print('Chain ID:', w3.eth.chain_id) # 1666600000
print('Latest block:', w3.eth.block_number)
# Ultra-low gas price
gas_price = w3.eth.gas_price
print(f'Gas price: {w3.from_wei(gas_price, "gwei")} Gwei')
# Get ONE balance
address = '0x...'
balance = w3.eth.get_balance(address)
print(f'ONE Balance: {w3.from_wei(balance, "ether")} ONE')
# Fast transaction confirmation
tx_hash = w3.eth.send_raw_transaction(signed_tx)
receipt = w3.eth.wait_for_transaction_receipt(tx_hash, timeout=5)
print(f'Transaction confirmed in {receipt.blockNumber} block')
print('Finality achieved in ~2 seconds!')const { ethers } = require('ethers');
const provider = new ethers.WebSocketProvider('wss://rpc.crypto-chief.com/harmony/ws/YOUR_API_KEY');
let lastBlockTime = Date.now();
// Monitor rapid block production
provider.on('block', async (blockNumber) => {
const now = Date.now();
const timeSinceLastBlock = (now - lastBlockTime) / 1000;
lastBlockTime = now;
const block = await provider.getBlock(blockNumber);
console.log(`Block ${blockNumber}: ${timeSinceLastBlock.toFixed(2)}s since last`);
console.log(`Transactions: ${block.transactions.length}`);
});
// Monitor cross-chain bridge events
const HORIZON_BRIDGE = '0x...'; // Horizon Bridge contract
const bridgeFilter = {
address: HORIZON_BRIDGE,
topics: [ethers.id('TokensLocked(address,uint256,uint256,uint256)')]
};
provider.on(bridgeFilter, (log) => {
const decoded = ethers.AbiCoder.defaultAbiCoder().decode(
['address', 'uint256', 'uint256', 'uint256'],
log.data
);
console.log('Cross-chain bridge activity:');
console.log('User:', decoded[0]);
console.log('Amount:', ethers.formatEther(decoded[1]));
});Sharded blockchain infrastructure
Infrastructure delivering true 2-second finality with <60ms RPC latency for responsive user experiences.
Production-grade infrastructure with Fast BFT consensus achieving 99.9% uptime and proven security since 2019.
Comprehensive monitoring of 4-shard activity, cross-shard communication, bridge volumes, and network performance.
Strategically deployed nodes across continents ensuring low-latency access to Harmony's sharded blockchain.
Infrastructure designed to scale with Harmony's sharded architecture supporting growing transaction volumes.
24/7 support from engineers specialized in sharding, FBFT consensus, and cross-chain bridge integration.
Build fast & affordable dApps
Harmony's 2-second finality and ultra-low fees enable responsive DeFi protocols, cross-chain applications, NFT platforms, and high-frequency gaming applications.
Build decentralized exchanges aggregating liquidity from Ethereum, BSC, Bitcoin via Horizon Bridge with instant swaps.
Create multi-chain yield optimization platforms leveraging Harmony's bridges to access opportunities across ecosystems.
Deploy lending, trading, and derivatives platforms where 2-second finality enables responsive user interactions.
Launch NFT platforms where ultra-low fees make minting, trading, and collecting economically viable.
Build games leveraging 2-second finality for real-time interactions and ~$0.000001 fees for frequent actions.
Develop payment systems where instant finality and minimal fees enable micro-transactions and remittances.
Start building on Web3 — no credit card.
Flexible pay-as-you-go for any workload.
From $500 monthly plus 20% extra value.
Tailored solution for expert builders
All Subscription features plus: