How to Add Harmony to MetaMask

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Adding Harmony (ONE) to your MetaMask wallet opens the door to a high-performance, EVM-compatible blockchain known for fast transactions, low fees, and an expanding ecosystem of decentralized applications (dApps). Whether you're interested in staking, trading, or exploring NFT marketplaces on Harmony, integrating it with MetaMask is a simple and essential first step. This guide walks you through the process while providing valuable context about the Harmony blockchain, its features, and why it’s worth considering in 2025.

What Is Harmony (ONE)?

Harmony is a blockchain platform launched in 2018 by Stephen Tse, a former software engineer at Apple and Google. Designed to address the blockchain trilemma—security, scalability, and decentralization—Harmony goes a step further by incorporating privacy as a fourth core principle. The network achieved mainnet launch in June 2019 and introduced validator node participation in May 2020, fostering a more decentralized infrastructure.

One of Harmony’s standout technical features is sharding, a method that splits the network into smaller, parallel chains (shards). Each shard can process up to 500 transactions per second (TPS), allowing the entire network to achieve around 2,000 TPS—with room to scale further as more shards are added. This makes Harmony significantly faster than many first-generation blockchains.

👉 Learn how to connect high-speed blockchains like Harmony to your wallet in seconds.

Despite being built independently, Harmony supports the Ethereum Virtual Machine (EVM), enabling seamless compatibility with Ethereum-based tools, dApps, and smart contracts. This means developers can deploy or migrate their projects to Harmony with minimal changes, making it an attractive alternative for those seeking lower fees and faster confirmation times.

dApps and Ecosystem Growth on Harmony

Harmony hosts over 40 active decentralized applications, with its ecosystem growing steadily thanks to EVM compatibility. Popular Ethereum-based protocols such as SushiSwap, Curve Finance, and Aave have expanded to Harmony, offering users familiar DeFi experiences at a fraction of the cost.

In addition to these cross-chain migrations, Harmony has nurtured native innovations. Projects like LMA Art Gallery and daVinci NFT Marketplace showcase the platform’s support for digital art and collectibles. The ability to create HRC-20 (fungible), HRC-721 (single NFT), and HRC-1155 (multi-token standard) tokens further empowers creators and developers—functionally equivalent to Ethereum’s ERC standards but optimized for Harmony’s architecture.

This blend of interoperability and innovation makes Harmony a compelling choice for users exploring beyond Ethereum’s congested network.

Understanding the ONE Token

The ONE token is the native cryptocurrency of the Harmony blockchain. It serves several critical functions:

While only validators can directly vote on governance proposals, token holders can delegate their stake to validators who align with their views—effectively influencing decisions without running a node.

An important economic detail: ONE has an annual inflation rate of approximately 3%, designed to incentivize staking. However, this inflation is counterbalanced by a built-in token burn mechanism—all transaction fees paid in ONE are permanently removed from circulation. This dynamic helps maintain long-term supply stability without risking deflation.

Staking ONE Tokens for Passive Income

Staking on Harmony offers attractive yields, typically around 10% APY, whether you're a validator or a delegator.

By staking, you contribute to network security while earning rewards. Many centralized exchanges like Binance and KuCoin also support Harmony staking, but using non-custodial wallets like MetaMask gives you full control over your assets.

Bridging Assets to Harmony

Most users bring assets to Harmony via cross-chain bridges. The Horizen Bridge (formerly Zendoo) is one popular option for transferring BEP-20 tokens from Binance Smart Chain (BSC) to Harmony.

⚠️ Important: Never send tokens directly to a wallet address without using a bridge. Doing so may result in permanent loss of funds.

Bridging allows you to convert ERC-20 or BEP-20 tokens into their HRC equivalents on Harmony—unlocking access to DeFi platforms and NFT markets within the ecosystem.

👉 Discover how bridging works and securely move assets across chains today.

Smart Contracts and Developer Adoption

Harmony’s EVM compatibility has fueled rapid adoption among developers. Deploying smart contracts on Harmony is nearly identical to Ethereum, requiring only minor configuration changes. As a result, the number of active contracts has grown from hundreds to thousands.

For dApps facing high gas costs or congestion on Ethereum, migrating to Harmony offers a scalable solution. Additionally, launching tokens as HRC-20 or HRC-721 standards allows projects to tap into multiple ecosystems—increasing visibility, liquidity, and utility.

Wallets That Support Harmony

While Harmony offers its own browser extension wallet, most users prefer MetaMask due to its familiarity and broad support. Any wallet that allows custom EVM network additions can integrate with Harmony by inputting the correct RPC settings.

Other compatible wallets include:

To check your ONE balance or interact with dApps, your wallet connects to Harmony’s block explorer: explorer.harmony.one.

You can purchase ONE tokens on major exchanges like Binance, Coinbase, and Kraken. Always verify prices using trusted sources like CoinGecko or CoinMarketCap before trading.

Note: This article does not constitute financial advice. Always conduct your own research before investing.

How to Add Harmony to MetaMask – Step by Step

Follow these steps to add the Harmony network to your MetaMask wallet:

  1. Open MetaMask in your browser or mobile app.
  2. Click the network dropdown (usually showing “Ethereum Mainnet”).
  3. Select “Add Network” > “Add a Custom RPC Network.”

  4. Enter the following details:

    • Network Name: Harmony One
    • RPC URL: https://api.harmony.one
    • Chain ID: 1666600000
    • Currency Symbol: ONE
    • Block Explorer URL: https://explorer.harmony.one
  5. Click Save.

Once added, you can switch to the Harmony network anytime via the network selector. Your wallet will now display your ONE token balance and allow interaction with Harmony-based dApps.

To send or receive tokens, always confirm you're on the correct network—switching between EVM chains like Ethereum, BSC, and Harmony is seamless but requires attention to avoid errors.

👉 Start exploring EVM-compatible networks with one secure wallet setup.

Frequently Asked Questions (FAQ)

Q: Is Harmony compatible with MetaMask?
A: Yes. Since Harmony supports the Ethereum Virtual Machine (EVM), it works seamlessly with MetaMask by adding a custom RPC network.

Q: Can I lose my funds if I send them directly to MetaMask?
A: Only if you're sending from another chain without using a bridge. Always use official cross-chain bridges when transferring assets between networks.

Q: Do I need ONE tokens to use Harmony dApps?
A: Yes. Like ETH on Ethereum, ONE is required to pay gas fees when interacting with smart contracts or transferring tokens on the network.

Q: What is the Chain ID for Harmony?
A: The mainnet Chain ID is 1666600000. Ensure this matches when adding the network to avoid connection issues.

Q: Can I stake ONE tokens directly in MetaMask?
A: Not natively. You’ll need to use a staking platform or dApp that integrates with MetaMask, such as the official Harmony staking portal.

Q: Are transaction fees on Harmony low compared to Ethereum?
A: Significantly lower. Gas fees on Harmony are typically fractions of a cent, making it ideal for frequent transactions or micro-interactions.

By integrating Harmony into MetaMask, you gain access to a fast, affordable, and developer-friendly blockchain ecosystem. With growing adoption in DeFi and NFTs, now is an excellent time to explore what Harmony has to offer—securely and efficiently.