How to change the RPC URL in MetaMask? (Node Settings)

Accessing Network Settings in MetaMask

1. Open the MetaMask browser extension or mobile application and ensure you are logged into your wallet.

2. Click or tap the network name displayed in the top-left corner—typically labeled “Ethereum Mainnet” or similar.

3. A dropdown menu appears showing all available networks; select “Edit Network” if the desired RPC endpoint is already listed, or choose “Add Network” to introduce a new one.

4. On desktop, this opens a modal window with editable fields including Network Name, New RPC URL, Chain ID, Currency Symbol, and Block Explorer URL.

5. On mobile, navigate to Settings → Networks → Select Network → Edit to reach the same configuration interface.

Entering Custom RPC Configuration

1. Input a descriptive Network Name, such as “Arbitrum One Custom” or “Base Testnet”.

2. Paste the full RPC URL into the designated field—this must be a valid HTTPS or WSS endpoint, for example: https://arb1.arbitrum.io/rpc.

3. Provide the correct Chain ID; mismatched values prevent proper transaction signing and block synchronization.

4. Specify the native token symbol—commonly ETH, but may differ on L2s like MATIC on Polygon or BNB on BSC.

5. Enter a valid Block Explorer URL, such as https://arbiscan.io, to enable transaction verification outside MetaMask.

Verifying RPC Connectivity

1. After saving the network, MetaMask attempts an immediate connection to the RPC endpoint.

2. If the URL is unreachable or returns malformed JSON-RPC responses, MetaMask displays an error: “Could not fetch chain ID” or “Network not supported”.

3. Users can test connectivity manually by using curl or Postman to send a sample request: {'jsonrpc':'2.0','method':'eth_chainId','params':[],'id':1}.

4. Timeouts exceeding 10 seconds often indicate firewall restrictions, CORS misconfigurations on the node server, or invalid SSL certificates.

5. Switching to alternative providers—such as Alchemy, Infura, or QuickNode—may resolve persistent connectivity failures due to rate limiting or regional outages.

Managing Multiple RPC Endpoints

1. MetaMask allows storing multiple custom networks, each with its own RPC URL, enabling rapid switching between environments like mainnet, testnets, and sidechains.

2. To replace an existing RPC without deleting the network, revisit the Edit Network screen and overwrite the current RPC URL field.

3. Some third-party dApps inject their own RPC via wallet_connect or EIP-3085 requests, temporarily overriding user-defined settings during session scope.

4. Exported network configurations are not stored in browser local storage beyond the MetaMask vault; reinstalling the extension requires re-entering all custom RPC details.

5. Community-maintained lists—like ChainList.org—offer verified RPC URLs and auto-import functionality through a secure connection handshake.

Frequently Asked Questions

Q1. Can I use HTTP instead of HTTPS for my RPC URL?MetaMask enforces HTTPS for all custom RPC endpoints on desktop browsers due to mixed-content security policies. HTTP URLs will be rejected outright.

Q2. Why does MetaMask show “Unknown Network” after changing the RPC URL?This occurs when the Chain ID returned by the new RPC does not match the one saved in the network configuration. Recheck the response to eth_chainId and update the Chain ID field accordingly.

Q3. Does changing the RPC URL affect my private keys or wallet balance?No. The RPC URL only determines how MetaMask communicates with the blockchain’s consensus layer. Private keys remain encrypted locally, and balances are recalculated from on-chain data fetched via the new endpoint.

Q4. Can I set different RPC URLs for the same network across devices?Yes. Each MetaMask instance maintains independent network configurations. Desktop, mobile, and browser extensions store RPC settings separately unless synced via the same seed phrase and cloud backup toggle.