cast-overview.md

Overview of cast

cast is Foundry's command-line tool for performing Ethereum RPC calls. You can make smart contract calls, send transactions, or retrieve any type of chain data - all from your command-line!

How to use cast

To use cast, use the cast keyword followed by a subcommand:

$ cast <subcommand>

Examples

Let's use cast to retrieve the total supply of the DAI token:

$ cast call 0x6b175474e89094c44da98b954eedeac495271d0f "totalSupply()(uint256)" --rpc-url <your_rpc_url>
9086622410684231497979028744

cast also provides many convenience functionalities, such as decoding calldata:

$ cast 4byte-decode 0x1F1F897F676d00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003e7
1) "fulfillRandomness(bytes32,uint256)"
0x676d000000000000000000000000000000000000000000000000000000000000
999

📚 Reference

See the cast Reference for a complete overview of all the available subcommands.