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Overview

Explore Harmony, the open blockchain with 2-second finality, low fees, and secure cross-chain bridges for Ethereum apps. Dive into historical data now!
GoldRush offers the most comprehensive Harmony Data API suite for developers, analysts, and enterprises. Whether you’re building a DeFi dashboard, a wallet, a trading bot, an AI agent or a compliance platform, our Harmony Data APIs provide fast, accurate, and developer-friendly access to the essential onchain data you need.

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Supported APIs

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Mainnet

PropertyValue
Chain Nameharmony-mainnet
Chain ID1666600000
Network TypeArchived Chain
Support Levelarchived
Block ExplorerExplorer
Official WebsiteHarmony Website
Native Gas TokenONE

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Testnet

PropertyValue
Chain Nameharmony-testnet
Chain ID1666700000
PurposeDevelopment and testing network
Support Levelarchived
Block ExplorerExplorer
Official WebsiteHarmony Testnet Website
Native Gas TokenONE

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API Usage

To use this blockchain network in GoldRush API calls, use:

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Chain Name

  • harmony-mainnet (mainnet)
  • harmony-testnet (testnet)

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Example Streaming Subscription

subscription {
  walletTxs(
    chain_name: HARMONY_MAINNET,
    wallet_addresses: ["0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"]
  ) {
    block_signed_at
    block_height
    tx_hash
    tx_offset
    successful
    decoded_type
  }
}
Connect via WebSocket at wss://streaming.goldrushdata.com/graphql with your API key in the connection parameters. See the Streaming API Quickstart for full setup details.

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Additional Resources