MetaMask supports testnets out of the box, but some networks need to be added manually. This guide covers the four most common EVM testnets.
Enable test networks in MetaMask
By default MetaMask hides testnets. To show them:
- Open MetaMask and click the network selector at the top.
- Toggle Show test networks to on.
- Sepolia will now appear in the list.
Sepolia (Ethereum testnet)
Sepolia is already built into MetaMask — just select it from the network dropdown.
| Parameter | Value |
|---|---|
| Chain ID | 11155111 |
| RPC | https://rpc.sepolia.org |
| Explorer | sepolia.etherscan.io |
Base Sepolia
Add it manually via Add a custom network:
| Parameter | Value |
|---|---|
| Network name | Base Sepolia |
| RPC URL | https://sepolia.base.org |
| Chain ID | 84532 |
| Currency symbol | ETH |
| Explorer | sepolia.basescan.org |
Polygon Amoy
| Parameter | Value |
|---|---|
| Network name | Polygon Amoy |
| RPC URL | https://rpc-amoy.polygon.technology |
| Chain ID | 80002 |
| Currency symbol | MATIC |
| Explorer | amoy.polygonscan.com |
BNB Smart Chain Testnet
| Parameter | Value |
|---|---|
| Network name | BNB Testnet |
| RPC URL | https://data-seed-prebsc-1-s1.bnbchain.org:8545 |
| Chain ID | 97 |
| Currency symbol | tBNB |
| Explorer | testnet.bscscan.com |
Tip
You can use the Tools → RPC Checker on this site to verify any RPC endpoint responds before adding it to MetaMask.