Can I use ENS names like 'vitalik.eth' to fetch code?

No, this skill currently requires the full 40-character hex contract address starting with 0x.

Does this work for contracts that haven't been verified?

No, this skill can only retrieve source code that has been publicly verified on the target chain's block explorer.

Do I need an API key to fetch contract source code?

Yes, you need an API key for the respective block explorer (e.g., Etherscan, Polygonscan) set as an environment variable.

What local dependencies are required?

You must have the Foundry toolkit installed, specifically the 'cast' binary, for the script to function.

Which blockchain networks are supported by this skill?

The skill supports Ethereum, Polygon (Matic), Arbitrum, Optimism, Base, and Binance Smart Chain (BSC).

EVM Smart Contract Source Fetcher

Name: EVM Smart Contract Source Fetcher
Author: cheolwanpark

bycheolwanpark

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Developer Tools

Fetches verified smart contract source code directly from block explorers for Ethereum and compatible EVM chains.

About

This skill enables Claude to retrieve the original, verified source code of smart contracts from major EVM-compatible networks including Ethereum, Polygon, Arbitrum, and more. By integrating with block explorer APIs like Etherscan and utilizing the Foundry 'cast' utility, it allows developers and security researchers to quickly analyze contract logic, verify implementations, and perform on-the-fly audits without leaving their terminal environment.

Key Features

Support for network-specific API keys for reliable data fetching
Automatic mapping of chain aliases for easier command execution
Multi-chain support including Ethereum, Polygon, Arbitrum, Optimism, Base, and BSC
Seamless integration with Foundry's 'cast' command-line tool
Retrieves original, multi-file verified source code from block explorers
2 GitHub stars

Use Cases

Studying production-grade DeFi protocol implementations for educational purposes
Conducting rapid security audits and vulnerability assessments of on-chain contracts
Verifying contract logic and state variables before interacting with Web3 applications

About

Key Features

Support for network-specific API keys for reliable data fetching
Automatic mapping of chain aliases for easier command execution
Multi-chain support including Ethereum, Polygon, Arbitrum, Optimism, Base, and BSC
Seamless integration with Foundry's 'cast' command-line tool
Retrieves original, multi-file verified source code from block explorers
2 GitHub stars

Use Cases

Studying production-grade DeFi protocol implementations for educational purposes
Conducting rapid security audits and vulnerability assessments of on-chain contracts
Verifying contract logic and state variables before interacting with Web3 applications