Harmony Node API

Number of APIs: 30

Harmony is a fast and secure blockchain for decentralized applications. Our production Mainnet supports 2 shards of 500 nodes, producing blocks in 2 seconds with finality.

Our Effective Proof-of-Stake (EPoS) reduces centralization while supporting stake delegation, reward compounding, and double-sign slashing.

API Frameworks

There are 2 API frameworks to interact with the nodes on the Harmony network:

RPCs (Remote Procedure Calls)
Rosetta

SDKs

Harmony has several SDKs that you can use to interact with the network.

Language	Github	Documentation
Javascript	https://github.com/harmony-one/sdk	https://harmony.one/js-sdk
Golang	https://github.com/harmony-one/go-sdk	N/A
Java	https://github.com/harmony-one/harmonyj	N/A
Python	https://github.com/harmony-one/pyhmy	N/A

Rosetta SDKs

Harmony is in the process of updating the main SDKs to use the Harmony Rosetta API.
Rosetta and the community has full SDKs for any Rosetta enabled network, including Harmony.

Language	Github	Documentation
Javascript	https://github.com/SmartArray/rosetta-node-sdk	https://www.rosetta-api.org/docs/welcome.html
Golang	https://github.com/coinbase/rosetta-sdk-go	https://www.rosetta-api.org/docs/welcome.html

Any Harmony specific details for Rosetta is documented in the section below.