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Harmony Devnet Shard 1

Add Harmony Devnet Shard 1 to Your Wallet — MetaMask, OKX, Rabby, Trust Wallet

Testnet
Chain ID: 1666900001·Symbol: ONE

Harmony Devnet Shard 1 is an EVM-compatible blockchain with Chain ID 1666900001 and native token ONE. This page lets you add Harmony Devnet Shard 1 to MetaMask, Rabby Wallet, OKX Wallet or Trust Wallet in one click — no manual Chain ID or RPC entry required.

RPC Endpoints
https://api.s1.ps.hmny.io

What is Harmony Devnet Shard 1?

Harmony Devnet Shard 1 is an EVM (Ethereum Virtual Machine) compatible blockchain network. Any EVM wallet — MetaMask, Rabby, OKX Wallet, Trust Wallet, Coinbase Wallet — can connect and transact on Harmony Devnet Shard 1 once you add the network configuration.

Why do you need to add Harmony Devnet Shard 1 to your wallet?

MetaMask and most wallets only come pre-configured with Ethereum Mainnet. To transact, swap tokens, or use dApps on Harmony Devnet Shard 1, you need to add the network first. Entering an incorrect Chain ID or RPC can put your assets at risk. Use the "Add to wallet" button above — data sourced directly from chainid.network, the canonical Ethereum chain registry.

How to add Harmony Devnet Shard 1 to your wallet

  1. 1

    Click Add to wallet

    Press the "Add to wallet" button above. MetaMask, OKX Wallet, Rabby Wallet or Trust Wallet will show a popup asking you to confirm adding the Harmony Devnet Shard 1 network.

  2. 2

    Confirm in your wallet

    Your wallet shows the Harmony Devnet Shard 1 network details: Chain ID 1666900001, native token ONE. Verify the Chain ID is correct, then click "Approve" or "Add Network".

  3. 3

    Switch to the new network

    After confirming, your wallet automatically switches to Harmony Devnet Shard 1. You can start transacting right away — you will need ONE to pay gas fees.

Harmony Devnet Shard 1 network technical details

To add manually, go to Settings → Networks → Add Network in MetaMask (or your wallet's equivalent) and enter the details below:

NameHarmony Devnet Shard 1
Chain ID1666900001
Native tokenONE
Decimals18
RPC Endpointhttps://api.s1.ps.hmny.io

Important notice

  • •Always verify Chain ID 1666900001 before confirming — attackers sometimes create fake networks with similar names but different Chain IDs
  • •You need ONE tokens in your wallet to pay gas fees for transactions on Harmony Devnet Shard 1
  • •Data on this page is sourced from chainid.network — the community-verified Ethereum chain registry
  • •If the "Add to wallet" button doesn't work, your wallet may not support wallet_addEthereumChain — add the network manually using the details below

Frequently asked questions

Is it safe to add Harmony Devnet Shard 1 to MetaMask?▾
Yes, if you use the "Add to wallet" button on this page. Data is sourced from chainid.network — the community-audited Ethereum registry. Adding a network does not expose your private key or grant any permissions to the dApp.
What is Harmony Devnet Shard 1 Chain ID?▾
The Chain ID of Harmony Devnet Shard 1 is 1666900001. This unique number identifies the network and prevents MetaMask and other EVM wallets from mixing up transactions across different chains.
Do I need ONE tokens to use Harmony Devnet Shard 1?▾
Yes. Every transaction on Harmony Devnet Shard 1 requires ONE to pay gas fees. You can purchase ONE on exchanges and bridge it to Harmony Devnet Shard 1, or use a faucet if this is a testnet.
What is the Harmony Devnet Shard 1 RPC endpoint?▾
An RPC endpoint is the server address your wallet uses to communicate with the Harmony Devnet Shard 1 blockchain — sending transactions, reading balances, and checking state. One popular Harmony Devnet Shard 1 RPC is https://api.s1.ps.hmny.io. This page shows live latency for each RPC so you can pick the fastest one.
My wallet says Harmony Devnet Shard 1 already exists when I click Add — what do I do?▾
That's completely normal. If Harmony Devnet Shard 1 is already in your wallet, it will simply switch to that network instead of adding a duplicate — no error or conflict.
I added Harmony Devnet Shard 1 but the network won't load — what's wrong?▾
The most common cause is a broken or overloaded RPC endpoint. Your wallet uses RPC to connect to the blockchain — if the RPC is down, the network won't load even if it was added correctly. Fix: copy a different RPC from the list above (prefer green low-latency ones), then go to Settings → Networks in your wallet and replace the old RPC with the new one. Watch the tutorial video above for step-by-step instructions on updating your RPC.