---
name: metamask-df59d39537af
description: Work with MetaMask wallet - add custom networks, import ERC-20 tokens, manage permissions, configure gas settings, and integrate with dApps.
metadata: {"openclaw":{"requires":{"bins":["cast"]},"install":[{"id":"foundry","kind":"shell","command":"curl -L https://foundry.paradigm.xyz | bash && foundryup","bins":["cast"],"label":"Install Foundry (cast)"}]}}
---

# 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:
```bash
cast balance YOUR_ADDRESS --ether --rpc-url https://eth.llamarpc.com
```

Token balance:
```bash
cast call 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 \
  "balanceOf(address)(uint256)" YOUR_ADDRESS \
  --rpc-url https://eth.llamarpc.com
```

## ENS Names

Resolve ENS:
```bash
cast resolve-name vitalik.eth --rpc-url https://eth.llamarpc.com
```

Reverse lookup:
```bash
cast lookup-address YOUR_ADDRESS --rpc-url https://eth.llamarpc.com
```

## Gas Settings

Settings → Advanced → Advanced Gas Controls

Check current gas:
```bash
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:
```bash
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

1. Connect Ledger/Trezor
2. Account menu → Connect Hardware Wallet
3. Select device and address

## Custom Nonce

Settings → Advanced → Customize transaction nonce

Get current nonce:
```bash
cast nonce YOUR_ADDRESS --rpc-url https://eth.llamarpc.com
```

## Speed Up / Cancel Transaction

Pending tx → Speed Up or Cancel

Replace with CLI:
```bash
# 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:**
```bash
# 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

1. Mobile: Settings → Sync with Extension
2. Scan QR code from extension
3. 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


---
Source attribution: kbarbel640-del
Original project: https://github.com/kbarbel640-del/skills/blob/e7e336ac628c3e3bd771aff1aaa469c93778f94a/skills/sakaen736jih/metamask/SKILL.md
License: MIT
License information: https://opensource.org/license/mit
Original upstream instructions; downloaded from Mega AI Hub.

## Upstream license notice

MIT License

Copyright (c) 2026 clawdbot

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.



# Mega AI Hub resource metadata

Creator / publisher: kbarbel640-del
Original project: https://github.com/kbarbel640-del/skills/blob/e7e336ac628c3e3bd771aff1aaa469c93778f94a/skills/sakaen736jih/metamask/SKILL.md
Attribution basis: Source repository record

Fields of work: Development & Engineering, Product Management
Roles: Backend Developer, Full-Stack Developer, Product Manager
Specialties: API, Backend
Tools: Cast, Metamask
Country applicability: Country not specified
Classification basis: Source catalog labels
Instruction SHA-256: d76bbef0168697e732bc4ca9f4ee09e78034839b6f3e0b8d0376b582a1af252a