How do I install the Ethereum skill?

Run npx skillmds@latest add knownasnaffy/ethereum in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Ethereum safe to use?

This skill has not completed SkillMD's automated safety review yet. Independent scanners report: SkillSpector: CAUTION, Skill Scanner: WARNING. Capability flags: makes network calls, reads secrets. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Ethereum?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Ethereum free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Ethereum?

knownasnaffy (@knownasnaffy) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Ethereum by knownasnaffy — Agent Skill

Name: Ethereum
Rating: 4.2 (5 reviews)
Author: knownasnaffy

File contents

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

---name: ethereumdescription: Interact with Ethereum blockchain - check ETH and ERC-20 balances, view transactions, gas prices, and ENS lookups. Works with MetaMask addresses.--- # Ethereum Wallet CLI ## Setup Install Foundry (includes `cast`): ```bash curl -L https://foundry.paradigm.xyz | bash foundryup ``` Set RPC (optional): ```bash export ETH_RPC_URL="https://eth.llamarpc.com" ``` ## Check ETH Balance ```bash cast balance <ADDRESS> --rpc-url https://eth.llamarpc.com ``` In ether (human readable): ```bash cast balance <ADDRESS> --ether --rpc-url https://eth.llamarpc.com ``` ## ENS Lookup Resolve ENS to address: ```bash cast resolve-name vitalik.eth --rpc-url https://eth.llamarpc.com ``` Reverse lookup (address to ENS): ```bash cast lookup-address <ADDRESS> --rpc-url https://eth.llamarpc.com ``` ## ERC-20 Token Balance ```bash # 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 ```bash # 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 ```bash cast tx <TX_HASH> --rpc-url https://eth.llamarpc.com ``` Transaction receipt: ```bash cast receipt <TX_HASH> --rpc-url https://eth.llamarpc.com ``` ## Gas Price Current gas price: ```bash cast gas-price --rpc-url https://eth.llamarpc.com ``` In gwei: ```bash cast --to-unit $(cast gas-price --rpc-url https://eth.llamarpc.com) gwei ``` ## Block Info Latest block: ```bash cast block latest --rpc-url https://eth.llamarpc.com ``` Specific block: ```bash cast block 17000000 --rpc-url https://eth.llamarpc.com ``` ## NFT (ERC-721) Owner ```bash cast call <NFT_CONTRACT> "ownerOf(uint256)(address)" <TOKEN_ID> --rpc-url https://eth.llamarpc.com ``` ## Account Nonce ```bash cast nonce <ADDRESS> --rpc-url https://eth.llamarpc.com ``` ## Chain Info ```bash 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

Frequently asked questions

Ethereum