Harmony

Harmony is an open blockchain with data sharding and fast finality. It enables micro-payments for social games and community AI, supports smart contracts for market pricing, and ensures data privacy with zero-knowledge proofs.

Networks Mainnet
Released 2019
Consensus Practical Byzantine Fault Tolerance (PBFT)
Smart contracts Yes
Block time ~2 seconds
Smart contract language(s) supported Solidity
Get started with Harmony

Bitcoin
Ethereum
XRP Ledger
Ethereum Classic
Bitcoin Cash
Dash
Litecoin
Dogecoin
Zilliqa
View all supported

The Harmony API — build without running a node

Access Harmony blockchain data through one unified REST API: transaction and address data, balances, block data, and real-time webhooks for on-chain events — with no Harmony node to run and maintain. Start free and scale as you grow.

Blockchain data

Read Harmony transactions, addresses, balances, UTXOs, and block data through one REST API.

Real-time webhooks

Subscribe to on-chain events — incoming and outgoing transactions, confirmations, and mined blocks.

No node to run

Skip the infrastructure — managed, always-synced access with no node to operate or maintain.

View the API docs Start building free

Building a full wallet? Explore Wallet as a Service.

What makes Harmony blockchain unique?

Utilizing onchain tokens, Harmony supports micro-payments for social games and community AI, along with smart contracts for market pricing and zero-knowledge proofs for data privacy. Harmony aims to scale trust and foster a fair economy through its decentralized, scalable, and secure platform, enabling transactions without reliance on trusted intermediaries.