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UB Smart Chain(testnet)

Add UB Smart Chain(testnet) to Your Wallet — MetaMask, OKX, Rabby, Trust Wallet

Testnet
Chain ID: 99998·Symbol: UBC

UB Smart Chain(testnet) is an EVM-compatible blockchain with Chain ID 99998 and native token UBC. This page lets you add UB Smart Chain(testnet) to MetaMask, Rabby Wallet, OKX Wallet or Trust Wallet in one click — no manual Chain ID or RPC entry required.

RPC Endpoints
https://testnet.rpc.uschain.network

What is UB Smart Chain(testnet)?

UB Smart Chain(testnet) 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 UB Smart Chain(testnet) once you add the network configuration.

Why do you need to add UB Smart Chain(testnet) to your wallet?

MetaMask and most wallets only come pre-configured with Ethereum Mainnet. To transact, swap tokens, or use dApps on UB Smart Chain(testnet), 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 UB Smart Chain(testnet) 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 UB Smart Chain(testnet) network.

  2. 2

    Confirm in your wallet

    Your wallet shows the UB Smart Chain(testnet) network details: Chain ID 99998, native token UBC. 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 UB Smart Chain(testnet). You can start transacting right away — you will need UBC to pay gas fees.

UB Smart Chain(testnet) network technical details

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

NameUB Smart Chain(testnet)
Chain ID99998
Native tokenUBC
Decimals18
RPC Endpointhttps://testnet.rpc.uschain.network

Important notice

  • •Always verify Chain ID 99998 before confirming — attackers sometimes create fake networks with similar names but different Chain IDs
  • •You need UBC tokens in your wallet to pay gas fees for transactions on UB Smart Chain(testnet)
  • •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 UB Smart Chain(testnet) 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 UB Smart Chain(testnet) Chain ID?▾
The Chain ID of UB Smart Chain(testnet) is 99998. This unique number identifies the network and prevents MetaMask and other EVM wallets from mixing up transactions across different chains.
Do I need UBC tokens to use UB Smart Chain(testnet)?▾
Yes. Every transaction on UB Smart Chain(testnet) requires UBC to pay gas fees. You can purchase UBC on exchanges and bridge it to UB Smart Chain(testnet), or use a faucet if this is a testnet.
What is the UB Smart Chain(testnet) RPC endpoint?▾
An RPC endpoint is the server address your wallet uses to communicate with the UB Smart Chain(testnet) blockchain — sending transactions, reading balances, and checking state. One popular UB Smart Chain(testnet) RPC is https://testnet.rpc.uschain.network. This page shows live latency for each RPC so you can pick the fastest one.
My wallet says UB Smart Chain(testnet) already exists when I click Add — what do I do?▾
That's completely normal. If UB Smart Chain(testnet) is already in your wallet, it will simply switch to that network instead of adding a duplicate — no error or conflict.
I added UB Smart Chain(testnet) 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.