EVM Contract Source Fetcher

Fetches verified smart contract source code from block explorers (Etherscan, Polygonscan, etc.).

Usage

Run the script with address and optional chain:

${CLAUDE_PLUGIN_ROOT}/scripts/crypto-evm-contract-source.sh <address> [chain]

Arguments

• address (required): Contract address in hex format (0x + 40 hex characters). ENS names are NOT supported.
• chain (optional): Chain name - ethereum (default), polygon, arbitrum, optimism, base, bsc

Supported Chains

| Chain | Aliases | Explorer | |-------|---------|----------| | ethereum | eth, mainnet | Etherscan | | polygon | matic | Polygonscan | | arbitrum | arb | Arbiscan | | optimism | op | Optimism Etherscan | | base | - | Basescan | | bsc | binance | BSCScan |

Requirements

• cast (Foundry) must be installed
• API key must be set for the target chain:
  • ETHERSCAN_API_KEY for Ethereum (also used as fallback for other chains)
  • POLYGONSCAN_API_KEY for Polygon
  • ARBISCAN_API_KEY for Arbitrum
  • OPTIMISM_API_KEY for Optimism
  • BASESCAN_API_KEY for Base
  • BSCSCAN_API_KEY for BSC

Examples

# Get WETH source on Ethereum
${CLAUDE_PLUGIN_ROOT}/scripts/crypto-evm-contract-source.sh 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2

# Get QuickSwap Router source on Polygon
${CLAUDE_PLUGIN_ROOT}/scripts/crypto-evm-contract-source.sh 0xa5E0829CaCEd8fFDD4De3c43696c57F7D7A678ff polygon

Note

For Solana program IDL, use the sol-program-idl skill instead.