An EVM-compatible sharded Harmony test network, Shard 0 (chain ID 1666700000) offering fast finality, low-cost ONE fees, and EPoS-driven scalability for dApp testing.
Harmony Testnet Shard 0 is the primary shard of Harmony’s public test network, mirroring mainnet EVM behavior for pre-production dApp, contract, and cross-chain bridge testing. It enables rapid, low-risk iterations with faucet ONE and measurable performance: block time ≈ 2s, avg gas price ≈ 1 gwei (simple transfer ≈ 21k gas ≈ 0.000021 ONE; typical contract calls 100k–300k gas ≈ 0.0001–0.0003 ONE), and observed testnet throughput ~10–50 TPS per shard (theoretical network-wide >2,000 TPS).
Harmony Testnet Shard 0 stands out with sharded EVM execution, FBFT consensus with BLS aggregation, and Effective Proof-of-Stake, delivering ~2s deterministic finality and ultra-low fees compared with most EVM testnets. It supports native cross-shard messaging and parallelism so developers can validate sharded routing and performance-sensitive workflows using standard Ethereum tooling. In practice, you get fast confirmations under light-to-moderate public activity with clear metrics for comparison: ~2s blocks, ~1 gwei gas, ~10–50 TPS on testnet loads, and sub-cent-equivalent fees (in ONE) for typical transactions.
Harmony Testnet Shard 0 uses ONE as the gas token for transaction fees. You can obtain ONE by bridging from other chains or purchasing using thirdweb Bridge, or through faucets (for testnet).
To bridge ONE to Harmony Testnet Shard 0, connect your wallet to thirdweb bridge, select your source chain, choose the token you want to bridge, select Harmony Testnet Shard 0 as the destination, enter the amount, and confirm the transaction. The bridge will handle the cross-chain transfer instantly.
To build on Harmony Testnet Shard 0 you can use thirdweb, which provides an easy way to build, monetize and scale your apps, games or agents. You can find detailed guides and documentation on https://portal.thirdweb.com to get started quickly.
To add Harmony Testnet Shard 0 to your wallet, you can connect your wallet and click on [Add to Wallet] button at the top of the page. Alternatively, you can add the network manually using the RPC URL and chain details and add it to your wallet's network settings.
To send ONE on Harmony Testnet Shard 0, ensure your wallet is connected to the Harmony Testnet Shard 0 network, enter the recipient's address, specify the amount of ONE to send, review the gas fee, and confirm the transaction in your wallet.
