The Harmony RPC documentation provides developers with a detailed guide to interact with the Harmony blockchain programmatically. Harmony uses a unique sharding mechanism and an effective proof-of-stake (EPoS) consensus to offer scalable and fast transactions with low fees. The documentation includes key API endpoints for querying blockchain data, managing transactions, and interacting with smart contracts. Harmony’s architecture makes it ideal for scalable decentralized applications (dApps), particularly in decentralized finance (DeFi) and enterprise solutions.

– Related: 📚 Supported Blockchains • 🌐 RPC Nodes → Harmony • 🔗 Official Harmony Website

RPC Gateway for Harmony blockchain

Harmony RPC networks

▶️ Run in Postman 🚀 Get Started

✨

Harmony Mainnet S0

🕵️ Explorer

↳ JSON-RPC

https://harmony-mainnet-s0.gateway.tatum.io

🔍 Status

✨

Harmony Testnet S0

🕵️ Explorer

↳ JSON-RPC

https://harmony-testnet-s0.gateway.tatum.io

🔍 Status

✨

Harmony Devnet S0

↳ JSON-RPC

https://harmony-devnet-s0.gateway.tatum.io

🔍 Status

Connect to Harmony and Fetch the Latest Block

This widget lets you instantly query the latest block height (or equivalent) for Harmony using a chain-specific RPC method like eth_blockNumber, getblockcount, or getBlockHeight. Useful for connectivity checks, uptime monitoring, or API testing.

Retrieve Harmony Node Status or Client Version via RPC

Use this pre-configured request to get version or status information for your connected Harmony node. Whether it's web3_clientVersion, getblockchaininfo, or chain-specific endpoints, the method is optimized for each supported blockchain.

Test Harmony RPC Methods in Postman

Explore and test Harmony blockchain methods instantly using our pre-configured Postman collection. Perfect for developers who want to experiment with Harmony RPC endpoints, validate API responses, or integrate Harmony into their applications.

How to use the Harmony Postman Collection

Get your API key: Visit Tatum Dashboard to obtain your free API key
Import the collection: Click the "Run in Postman" button below to import the Harmony collection
Configure your environment: Update the gateway-api-key variable in the Tatum Gateway environment
Start testing: Execute any Harmony RPC method and see real-time responses

▶️ Run in Postman

RPC Gateway for Harmony blockchain

Harmony RPC networks

Harmony Mainnet S0

Harmony Testnet S0

Harmony Devnet S0

Connect to Harmony and Fetch the Latest Block

Retrieve Harmony Node Status or Client Version via RPC

Test Harmony RPC Methods in Postman

How to use the Harmony Postman Collection

Available Harmony interfaces

Harmony - Tatum API