metamask
Work with MetaMask wallet - add custom networks, import ERC-20 tokens, manage permissions, configure gas settings, and integrate with dApps.
Install
mkdir -p .claude/skills/metamask && curl -L -o skill.zip "https://mcp.directory/api/skills/download/8821" && unzip -o skill.zip -d .claude/skills/metamask && rm skill.zipInstalls to .claude/skills/metamask
About this skill
MetaMask Wallet
Installation
- Chrome: https://chrome.google.com/webstore/detail/metamask/nkbihfbeogaeaoehlefnkodbefgpgknn
- Firefox: https://addons.mozilla.org/firefox/addon/ether-metamask/
- Mobile: iOS App Store / Google Play
- Flask (dev): https://metamask.io/flask/
Add Popular Networks
Settings → Networks → Add Network
Polygon:
Network: Polygon Mainnet
RPC: https://polygon-rpc.com
Chain ID: 137
Symbol: MATIC
Explorer: https://polygonscan.com
Arbitrum:
Network: Arbitrum One
RPC: https://arb1.arbitrum.io/rpc
Chain ID: 42161
Symbol: ETH
Explorer: https://arbiscan.io
Optimism:
Network: Optimism
RPC: https://mainnet.optimism.io
Chain ID: 10
Symbol: ETH
Explorer: https://optimistic.etherscan.io
Base:
Network: Base
RPC: https://mainnet.base.org
Chain ID: 8453
Symbol: ETH
Explorer: https://basescan.org
BSC:
Network: BNB Smart Chain
RPC: https://bsc-dataseed.binance.org
Chain ID: 56
Symbol: BNB
Explorer: https://bscscan.com
Avalanche:
Network: Avalanche C-Chain
RPC: https://api.avax.network/ext/bc/C/rpc
Chain ID: 43114
Symbol: AVAX
Explorer: https://snowtrace.io
Import ERC-20 Token
Assets → Import Token → Custom Token
Common tokens (Ethereum):
USDC: 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48
USDT: 0xdAC17F958D2ee523a2206206994597C13D831ec7
DAI: 0x6B175474E89094C44Da98b954EescdeCB5BE3830
WETH: 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2
LINK: 0x514910771AF9Ca656af840dff83E8264EcF986CA
UNI: 0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984
Check Balance (CLI)
ETH balance:
cast balance YOUR_ADDRESS --ether --rpc-url https://eth.llamarpc.com
Token balance:
cast call 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 \
"balanceOf(address)(uint256)" YOUR_ADDRESS \
--rpc-url https://eth.llamarpc.com
ENS Names
Resolve ENS:
cast resolve-name vitalik.eth --rpc-url https://eth.llamarpc.com
Reverse lookup:
cast lookup-address YOUR_ADDRESS --rpc-url https://eth.llamarpc.com
Gas Settings
Settings → Advanced → Advanced Gas Controls
Check current gas:
cast gas-price --rpc-url https://eth.llamarpc.com | xargs -I {} cast --to-unit {} gwei
Transaction History
Via Etherscan:
https://etherscan.io/address/YOUR_ADDRESS
Via CLI:
cast etherscan-source YOUR_ADDRESS --etherscan-api-key YOUR_KEY
Connected Sites
Settings → Connected Sites → Manage permissions
Account Management
Create account: Account menu → Create Account Import: Account menu → Import Account
Hardware Wallet
- Connect Ledger/Trezor
- Account menu → Connect Hardware Wallet
- Select device and address
Custom Nonce
Settings → Advanced → Customize transaction nonce
Get current nonce:
cast nonce YOUR_ADDRESS --rpc-url https://eth.llamarpc.com
Speed Up / Cancel Transaction
Pending tx → Speed Up or Cancel
Replace with CLI:
# Check pending nonce
cast nonce YOUR_ADDRESS --rpc-url https://eth.llamarpc.com
Export Account
Account menu → Account details → Export
Network RPC Endpoints
| Network | Free RPC |
|---|---|
| Ethereum | https://eth.llamarpc.com |
| Polygon | https://polygon-rpc.com |
| Arbitrum | https://arb1.arbitrum.io/rpc |
| Optimism | https://mainnet.optimism.io |
| Base | https://mainnet.base.org |
| BSC | https://bsc-dataseed.binance.org |
Troubleshooting
Stuck transaction:
# Get pending nonce
cast nonce YOUR_ADDRESS --pending --rpc-url https://eth.llamarpc.com
Then send 0 ETH to yourself with same nonce + higher gas
Wrong token balance: Assets → Refresh list, or reimport token
Network not connecting: Settings → Networks → Edit RPC URL
Reset account: Settings → Advanced → Clear activity tab data
MetaMask Snaps
Extend functionality with Snaps: Settings → Snaps → Browse Snaps
Popular snaps:
- Transaction Insights
- Account Management
- Interoperability
Mobile Sync
- Mobile: Settings → Sync with Extension
- Scan QR code from extension
- Or use same recovery phrase
Security Tips
- Never share recovery phrase
- Verify URLs before connecting
- Review permissions before approving
- Use hardware wallet for large amounts
- Enable phishing detection
Notes
- MetaMask is EVM-only (Ethereum and compatible chains)
- Default network is Ethereum mainnet
- Supports EIP-1559 transactions
- Built-in swap via aggregators
- Mobile has built-in browser
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