keypo-us/keypo-cli/weth-base-sepolia

Claude Code and agent skill by keypo-us/keypo-cli

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Interact with Wrapped Ether (WETH) at 0x4200000000000000000000000000000000000006 on Base Sepolia. Wrap and unwrap ETH, check balances, and manage ERC-20 WETH allowances. Use with keypo-wallet for transaction execution — use `cast calldata` to encode function calls and pipe to `keypo-wallet send` or `keypo-wallet batch`.

Install

npx vskill@latest install keypo-us/keypo-cli/weth-base-sepolia

SKILL.md

Wrapped Ether — WETH (Base Sepolia)

FieldValue
Address0x4200000000000000000000000000000000000006
ChainBase Sepolia (Chain ID: 84532)
TypeToken (ERC-20 wrapper for native ETH)
Decimals18
SymbolWETH
RPChttps://sepolia.base.org

Auto-generated from verified ABI. Do not modify the address or function signatures.

Read Functions

Use cast call — no wallet needed, no gas cost.

name
bash
cast call 0x4200000000000000000000000000000000000006 "name()(string)" --rpc-url https://sepolia.base.org
symbol
bash
cast call 0x4200000000000000000000000000000000000006 "symbol()(string)" --rpc-url https://sepolia.base.org
decimals
bash
cast call 0x4200000000000000000000000000000000000006 "decimals()(uint8)" --rpc-url https://sepolia.base.org
totalSupply
bash
cast call 0x4200000000000000000000000000000000000006 "totalSupply()(uint256)" --rpc-url https://sepolia.base.org
balanceOf
bash
cast call 0x4200000000000000000000000000000000000006 "balanceOf(address)(uint256)" <account> --rpc-url https://sepolia.base.org
allowance
bash
cast call 0x4200000000000000000000000000000000000006 "allowance(address,address)(uint256)" <owner> <spender> --rpc-url https://sepolia.base.org

Write Functions

Encode calldata with cast calldata, then execute via keypo-wallet.

deposit

Wrap ETH into WETH. Send ETH with the transaction and receive an equal amount of WETH.

bash
# This function is payable — specify the ETH amount to wrap in --value (wei)
keypo-wallet send --key <key-name> --to 0x4200000000000000000000000000000000000006 --value <wei-amount>

No calldata needed — calling the contract with ETH triggers the fallback/deposit. To use the explicit deposit() function:

bash
CALLDATA=$(cast calldata "deposit()")
keypo-wallet send --key <key-name> --to 0x4200000000000000000000000000000000000006 --data $CALLDATA --value <wei-amount>

Verify: Check your WETH balance after wrapping:

bash
cast call 0x4200000000000000000000000000000000000006 "balanceOf(address)(uint256)" <your-address> --rpc-url https://sepolia.base.org
withdraw

Unwrap WETH back into native ETH. Burns WETH and returns ETH to your wallet.

bash
CALLDATA=$(cast calldata "withdraw(uint256)" <wad>)
keypo-wallet send --key <key-name> --to 0x4200000000000000000000000000000000000006 --data $CALLDATA

Verify: Check your WETH balance decreased:

bash
cast call 0x4200000000000000000000000000000000000006 "balanceOf(address)(uint256)" <your-address> --rpc-url https://sepolia.base.org
approve

Approve a spender to transfer WETH on your behalf.

bash
CALLDATA=$(cast calldata "approve(address,uint256)" <spender> <wad>)
keypo-wallet send --key <key-name> --to 0x4200000000000000000000000000000000000006 --data $CALLDATA

Verify:

bash
cast call 0x4200000000000000000000000000000000000006 "allowance(address,address)(uint256)" <your-address> <spender> --rpc-url https://sepolia.base.org
transfer

Transfer WETH to another address.

bash
CALLDATA=$(cast calldata "transfer(address,uint256)" <recipient> <wad>)
keypo-wallet send --key <key-name> --to 0x4200000000000000000000000000000000000006 --data $CALLDATA

Verify:

bash
cast call 0x4200000000000000000000000000000000000006 "balanceOf(address)(uint256)" <recipient> --rpc-url https://sepolia.base.org
transferFrom

Transfer WETH from one address to another (requires prior approval).

bash
CALLDATA=$(cast calldata "transferFrom(address,address,uint256)" <src> <dst> <wad>)
keypo-wallet send --key <key-name> --to 0x4200000000000000000000000000000000000006 --data $CALLDATA

Verify:

bash
cast call 0x4200000000000000000000000000000000000006 "balanceOf(address)(uint256)" <dst> --rpc-url https://sepolia.base.org

Common Patterns

Wrap ETH (deposit)
bash
# Wrap 0.01 ETH into WETH
keypo-wallet send --key <key-name> --to 0x4200000000000000000000000000000000000006 --value 10000000000000000
Unwrap WETH (withdraw)
bash
# Unwrap 0.01 WETH back to ETH
CALLDATA=$(cast calldata "withdraw(uint256)" 10000000000000000)
keypo-wallet send --key <key-name> --to 0x4200000000000000000000000000000000000006 --data $CALLDATA
Approve + TransferFrom (batched)
bash
APPROVE_DATA=$(cast calldata "approve(address,uint256)" <spender> <wad>)
TRANSFER_DATA=$(cast calldata "transferFrom(address,address,uint256)" <your-address> <recipient> <wad>)
 
echo "[
  {\"to\": \"0x4200000000000000000000000000000000000006\", \"value\": \"0\", \"data\": \"$APPROVE_DATA\"},
  {\"to\": \"0x4200000000000000000000000000000000000006\", \"value\": \"0\", \"data\": \"$TRANSFER_DATA\"}
]" | keypo-wallet batch --key <key-name> --calls -

Amount Encoding

This token uses 18 decimals. Always convert human-readable amounts:

Human AmountRaw Amount (wei)
1.01000000000000000000
0.1100000000000000000
0.0110000000000000000
0.0011000000000000000
100100000000000000000000

To wrap 1.0 ETH into WETH:

bash
keypo-wallet send --key <key-name> --to 0x4200000000000000000000000000000000000006 --value 1000000000000000000

To transfer 1.0 WETH:

bash
CALLDATA=$(cast calldata "transfer(address,uint256)" <recipient> 1000000000000000000)
keypo-wallet send --key <key-name> --to 0x4200000000000000000000000000000000000006 --data $CALLDATA

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