Foundry's cast CLI for Ethereum interactions. Use when querying blockchain data, calling contracts, sending transactions, encoding/decoding data, or debugging on-chain issues. Triggers on "cast", "get balance", "call contract", "decode calldata", "check tx", "get block".
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See how to installReview the instructions the agent will receive before you install.
Cast is your swiss army knife for interacting with EVM chains from the command line.
# Mainnet
--rpc-url https://eth.llamarpc.com
# Arbitrum One
--rpc-url https://arb1.arbitrum.io/rpc
# Arbitrum Sepolia
--rpc-url https://sepolia-rollup.arbitrum.io/rpc
# Sepolia
--rpc-url https://rpc.sepolia.org
# Get ETH balance
cast balance <address> --rpc-url <rpc>
# Get ERC20 balance
cast call <token> "balanceOf(address)(uint256)" <address> --rpc-url <rpc>
# Get nonce
cast nonce <address> --rpc-url <rpc>
# Get contract code
cast code <address> --rpc-url <rpc>
# Get storage slot
cast storage <address> <slot> --rpc-url <rpc>
# Basic call
cast call <contract> "functionName(argTypes)(returnTypes)" <args> --rpc-url <rpc>
# Examples
cast call 0xdead "name()(string)" --rpc-url https://arb1.arbitrum.io/rpc
cast call 0xdead "totalSupply()(uint256)" --rpc-url https://arb1.arbitrum.io/rpc
cast call 0xdead "getReserves()(uint112,uint112,uint32)" --rpc-url https://arb1.arbitrum.io/rpc
# Send tx with private key
cast send <to> "function(types)" <args> --private-key <key> --rpc-url <rpc>
# Send ETH
cast send <to> --value 1ether --private-key <key> --rpc-url <rpc>
# With gas settings
cast send <to> "function()" --gas-limit 500000 --gas-price 1gwei --private-key <key> --rpc-url <rpc>
# Get tx details
cast tx <txhash> --rpc-url <rpc>
# Get tx receipt
cast receipt <txhash> --rpc-url <rpc>
# Trace/replay tx locally
cast run <txhash> --rpc-url <rpc>
# Decode tx
cast decode-transaction <raw_tx>
# Latest block number
cast block-number --rpc-url <rpc>
# Block details
cast block <block_number_or_hash> --rpc-url <rpc>
# Block timestamp
cast age <block_number> --rpc-url <rpc>
# Base fee
cast base-fee --rpc-url <rpc>
# Find block by timestamp
cast find-block <timestamp> --rpc-url <rpc>
# Encode function call
cast calldata "transfer(address,uint256)" 0xdead 1000000000000000000
# Encode without selector
cast abi-encode "transfer(address,uint256)" 0xdead 1000000000000000000
# Decode calldata
cast decode-calldata "transfer(address,uint256)" 0xa9059cbb...
# Decode output
cast decode-abi "uint256" 0x000000...
# Get function selector
cast sig "transfer(address,uint256)"
# Returns: 0xa9059cbb
# Lookup selector
cast 4byte 0xa9059cbb
# Wei conversions
cast to-wei 1.5 ether # 1500000000000000000
cast from-wei 1000000000000000000 ether # 1
# Hex/decimal
cast to-dec 0xff # 255
cast to-hex 255 # 0xff
# Checksummed address
cast to-check-sum-address 0xdead...
# Bytes32 padding
cast to-bytes32 0xdead
# String encoding
cast format-bytes32-string "hello"
cast parse-bytes32-string 0x68656c6c6f...
# Resolve name to address
cast resolve-name vitalik.eth --rpc-url https://eth.llamarpc.com
# Reverse lookup
cast lookup-address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 --rpc-url https://eth.llamarpc.com
# Get namehash
cast namehash vitalik.eth
# Get verified source
cast source <address> --etherscan-api-key <key> --chain mainnet
# Get constructor args
cast constructor-args <address> --etherscan-api-key <key> --chain arbitrum
# Get logs by topic
cast logs --from-block 0 --to-block latest --address <contract> "Transfer(address,address,uint256)" --rpc-url <rpc>
# Decode event
cast decode-event "Transfer(address indexed,address indexed,uint256)" <topics> <data>
# Estimate gas
cast estimate <to> "function(types)" <args> --rpc-url <rpc>
# Current gas price
cast gas-price --rpc-url <rpc>
# Keccak256 hash
cast keccak "hello"
# EIP-191 message hash
cast hash-message "hello"
# Compute CREATE2 address
cast create2 --starts-with 0xdead --init-code <bytecode> --deployer <factory>
# Compute deployment address
cast compute-address <deployer> --nonce <nonce>
# RPC call
cast rpc eth_blockNumber --rpc-url <rpc>
# Generate new wallet
cast wallet new
# Get address from private key
cast wallet address --private-key <key>
# Sign message
cast wallet sign "message" --private-key <key>
# Check L2 tx on Arbitrum
cast tx <hash> --rpc-url https://arb1.arbitrum.io/rpc
# Get L1 base fee on Arbitrum
cast call 0x000000000000000000000000000000000000006C "getL1BaseFeeEstimate()(uint256)" --rpc-url https://arb1.arbitrum.io/rpc
# Check ArbOS version
cast call 0x0000000000000000000000000000000000000064 "arbOSVersion()(uint256)" --rpc-url https://arb1.arbitrum.io/rpc
export ETH_RPC_URL=https://arb1.arbitrum.io/rpc
export ETHERSCAN_API_KEY=your_key
export PRIVATE_KEY=your_key
With ETH_RPC_URL set, omit --rpc-url from commands.
cast code <address>--json for machine-readable output: cast tx <hash> --jsoncast run <hash> --tracecast 4byte-decode <calldata>No reviews yet. Tell others what you thought.
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Arbitrum L2 development best practices. Use when implementing bridges, Orbit chains, SDK integrations, or debugging cross-chain transactions. Triggers on Arbitrum, L2, rollup, bridge, retryable, Orbit, Nitro, or cross-chain contexts.
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Create or improve lightweight, brand-consistent SVG concept diagrams for the Arbitrum docs, using the official Google Drive infographic asset kit as the palette/style source. Use when asked to "make a diagram more efficient", replace a bloated haw-*.svg (draw.io PNG-in-SVG exports), replace an ASCII / box-drawing diagram in an MDX page with a real image, author a new concept diagram for content/docs/how-arbitrum-works or similar, or build a diagram from the Arbitrum brand assets. Hand-authored lean vector SVG — not Mermaid, not a full Excalidraw/draw.io pipeline.
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Use when asked to rebrand, restyle, re-pace, resize, or re-render an existing explainer video, when a video's labels are baked-in raster pixels that cannot be edited, or when building a new animated explainer for the Arbitrum docs from a prompt or a doc section.
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Run full documentation quality audit, covering sidebar orphans, unused-file review, MDX structure, internal links, glossary references, contract addresses, variables, formatting, frontmatter, tests, and types. Triggers on "audit docs", "check docs quality", "find problems", "content audit".
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LLM Utility: Generate minimal project context map before starting any workflow. ALWAYS run this first at session start, before /prd, before /implement, or after context loss. Triggers on 'context prep', 'orient me', 'start', 'new session'.
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Create new Arbitrum development rules following best practices format. Use when capturing a reusable pattern, common mistake, or architectural decision. Triggers on "create rule", "add rule", "new rule", "document this pattern".
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