Harmony RPC Endpoint

Fast, flat-rate Harmony RPC node provider — free tier, no KYC, HTTP & WebSocket.

Harmony is a sharded proof-of-stake Layer 1 with EVM compatibility, using its native ONE token for gas and staking. It launched mainnet in 2019 and targets fast, low-fee transactions.

About Harmony

Harmony (chain ID 1666600000) launched its mainnet in June 2019. It uses Effective Proof-of-Stake (EPoS) for validator selection and Fast BFT (FBFT) for consensus, with roughly 2-second block times and single-block finality.

Harmony is EVM-compatible, so contracts deploy with standard Ethereum tooling, while addresses can also be represented in the bech32 'one1...' format. The native token is ONE, used for gas, staking, and governance.

Common Use Cases on Harmony

• Low-fee DeFi
• Cross-chain finance
• NFTs
• Staking
• EVM dApp deployment

Harmony Ecosystem

Harmony hosts EVM DeFi and bridge applications across its shards.

HTTP Endpoint

WebSocket Endpoint

Quick Start: Connect to Harmony

cURL

curl -X POST https://rpc.swiftnodes.io/rpc/harmony?key=YOUR_API_KEY \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}'

ethers.js

import { JsonRpcProvider } from "ethers";

const provider = new JsonRpcProvider(
  "https://rpc.swiftnodes.io/rpc/harmony?key=YOUR_API_KEY"
);

const blockNumber = await provider.getBlockNumber();
console.log("Harmony block:", blockNumber);

viem

import { createPublicClient, http } from "viem";

const client = createPublicClient({
  transport: http("https://rpc.swiftnodes.io/rpc/harmony?key=YOUR_API_KEY"),
});

const blockNumber = await client.getBlockNumber();

web3.py

from web3 import Web3

w3 = Web3(Web3.HTTPProvider("https://rpc.swiftnodes.io/rpc/harmony?key=YOUR_API_KEY"))
print("Harmony block:", w3.eth.block_number)

Add Harmony to MetaMask

Bridging to Harmony

Harmony's Horizon bridge connects to Ethereum and other chains; additional third-party bridges support asset transfers.

Features of SwiftNodes for Harmony

• Multiple load-balanced upstream nodes for high availability
• Health-checked every 60 seconds with automatic failover
• Free tier available — no credit card or KYC required
• Flat-rate monthly pricing with no per-request fees
• HTTP and WebSocket support
• One API key works across all 75+ supported chains, including Harmony

Rate Limits

Frequently Asked Questions: Harmony