ethereum – OpenClaw Skill

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name: ethereum description: Interact with Ethereum blockchain - check ETH and ERC-20 balances, view transactions, gas prices, and ENS lookups. Works with MetaMask addresses. 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)"}]}}

Ethereum Wallet CLI

Setup

Install Foundry (includes cast):

curl -L https://foundry.paradigm.xyz | bash
foundryup

Set RPC (optional):

export ETH_RPC_URL="https://eth.llamarpc.com"

Check ETH Balance

cast balance <ADDRESS> --rpc-url https://eth.llamarpc.com

In ether (human readable):

cast balance <ADDRESS> --ether --rpc-url https://eth.llamarpc.com

ENS Lookup

Resolve ENS to address:

cast resolve-name vitalik.eth --rpc-url https://eth.llamarpc.com

Reverse lookup (address to ENS):

cast lookup-address <ADDRESS> --rpc-url https://eth.llamarpc.com

ERC-20 Token Balance

# USDC balance (6 decimals)
cast call 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 \
  "balanceOf(address)(uint256)" <ADDRESS> \
  --rpc-url https://eth.llamarpc.com

# Format with decimals
cast call 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 \
  "balanceOf(address)(uint256)" <ADDRESS> \
  --rpc-url https://eth.llamarpc.com | xargs -I {} cast --to-unit {} 6

Token Info

# Token name
cast call <TOKEN_CONTRACT> "name()(string)" --rpc-url https://eth.llamarpc.com

# Token symbol
cast call <TOKEN_CONTRACT> "symbol()(string)" --rpc-url https://eth.llamarpc.com

# Decimals
cast call <TOKEN_CONTRACT> "decimals()(uint8)" --rpc-url https://eth.llamarpc.com

# Total supply
cast call <TOKEN_CONTRACT> "totalSupply()(uint256)" --rpc-url https://eth.llamarpc.com

Transaction Info

cast tx <TX_HASH> --rpc-url https://eth.llamarpc.com

Transaction receipt:

cast receipt <TX_HASH> --rpc-url https://eth.llamarpc.com

Gas Price

Current gas price:

cast gas-price --rpc-url https://eth.llamarpc.com

In gwei:

cast --to-unit $(cast gas-price --rpc-url https://eth.llamarpc.com) gwei

Block Info

Latest block:

cast block latest --rpc-url https://eth.llamarpc.com

Specific block:

cast block 17000000 --rpc-url https://eth.llamarpc.com

NFT (ERC-721) Owner

cast call <NFT_CONTRACT> "ownerOf(uint256)(address)" <TOKEN_ID> --rpc-url https://eth.llamarpc.com

Account Nonce

cast nonce <ADDRESS> --rpc-url https://eth.llamarpc.com

Chain Info

cast chain-id --rpc-url https://eth.llamarpc.com

Common Token Contracts

Token	Contract
USDC	0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48
USDT	0xdAC17F958D2ee523a2206206994597C13D831ec7
DAI	0x6B175474E89094C44Da98b954EescdeCB5BE3830
WETH	0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2
LINK	0x514910771AF9Ca656af840dff83E8264EcF986CA

Public RPC Endpoints

Provider	URL
LlamaRPC	https://eth.llamarpc.com
Ankr	https://rpc.ankr.com/eth
PublicNode	https://ethereum.publicnode.com
Cloudflare	https://cloudflare-eth.com

Notes

• Addresses are 0x-prefixed hex (42 characters)
• 1 ETH = 10^18 wei
• Gas prices fluctuate; check before transactions
• Rate limits apply on public RPCs
• Use --rpc-url or set ETH_RPC_URL environment variable