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# Ethereum helper methods | |
# source this in your .bashrc or .zshrc file with `. ~/.ethrc` | |
# --- Token addresses --- | |
aave=0x7Fc66500c84A76Ad7e9c93437bFc5Ac33E2DDaE9 | |
comp=0xc00e94Cb662C3520282E6f5717214004A7f26888 | |
crv=0xD533a949740bb3306d119CC777fa900bA034cd52 | |
dai=0x6B175474E89094C44Da98b954EedeAC495271d0F | |
gtc=0xDe30da39c46104798bB5aA3fe8B9e0e1F348163F | |
mkr=0x9f8F72aA9304c8B593d555F12eF6589cC3A579A2 | |
snx=0xC011a73ee8576Fb46F5E1c5751cA3B9Fe0af2a6F | |
tbtc=0x8dAEBADE922dF735c38C80C7eBD708Af50815fAa | |
uni=0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984 | |
usdc=0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 | |
usdn=0x674C6Ad92Fd080e4004b2312b45f796a192D27a0 | |
usdt=0xdAC17F958D2ee523a2206206994597C13D831ec7 | |
wbtc=0x2260FAC5E5542a773Aa44fBCfeDf7C193bc2C599 | |
weth=0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 | |
yfi=0x0bc529c00C6401aEF6D220BE8C6Ea1667F6Ad93e | |
# --- Prices / gas --- | |
# Returns the price in USD of the specified token | |
# https://www.coingecko.com/en/api/documentation | |
# example: `price eth` | |
# example: `price $gtc` | |
# example: `price <token>` | |
price() { | |
if [[ $1 = 'eth' ]]; then | |
echo $(curl -s https://api.coingecko.com/api/v3/simple/price\?ids\=ethereum\&vs_currencies\=usd | jq '.ethereum.usd') | |
else | |
echo $(curl -s https://api.coingecko.com/api/v3/coins/ethereum/contract/$1 | jq '.market_data.current_price.usd') | |
fi | |
} | |
# prints the basefee in gwei, and the cost in USD of sending transactions based on current basefee and no priority fee | |
gas() { | |
wad=1000000000000000000 # 1e18 | |
price_eth=$(price eth) | |
price_gas=$(seth basefee) | |
price_gas_gwei=$(seth --to-fix 9 $price_gas) | |
cost_transfer=$(echo "scale=10;$price_eth*$price_gas*21000/$wad" | bc) # ETH transfer | |
cost_swap=$(echo "scale=10;$price_eth*$price_gas*130000/$wad" | bc) # Uniswap V3 swap | |
cost_deploy=$(echo "scale=10;$price_eth*$price_gas*1000000/$wad" | bc) # Something expensive, like contract deployment | |
printf 'Basefee \t%1.3f\n' $price_gas_gwei | |
echo "" | |
printf 'Transfer \t21k gas \t $%1.3f\n' $cost_transfer | |
printf 'Swap \t130k gas \t $%1.3f\n' $cost_swap | |
printf 'Deploy \t1M gas \t $%1.3f\n' $cost_deploy | |
} | |
# --- 4byte lookups --- | |
# https://www.4byte.directory/docs/ | |
# Pass in a 4 byte function signature and get matching functions from 4byte.directory. This will also strip | |
# any appended calldata after the first four bytes | |
# example: `4byte 0x70a08231` | |
# example: `4byte 0xa9059cbb000000000000000000000000ae804d5b383350c487748c364ad7ec8f480e5b63000000000000000000000000000000000000000000000660a546d2d9a8e73ce3` | |
4byte() { | |
curl -s "https://www.4byte.directory/api/v1/signatures/?hex_signature=${1:0:10}" | jq . | |
} | |
# Pass in a 32 byte topic and get matching events from 4byte.directory | |
# example: `4byteEvent 0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef` | |
4byteEvent() { | |
curl -s "https://www.4byte.directory/api/v1/event-signatures/?hex_signature=$1" | jq . | |
} | |
# --- Calls --- | |
# example: `balanceOf <token> <address>` | |
# example: `balanceOf $dai <address>` | |
balanceOf() { | |
seth call $1 "balanceOf(address)(uint256)" $2 | |
} | |
# --- Seth helpers --- | |
# returns the basefee in gwei | |
alias basefee="seth --from-wei $(seth basefee) gwei" | |
# example: `tracetx <txhash>` (`trace` is a builtin command) | |
tracetx() { | |
seth run-tx $1 --trace | |
} | |
# example: `debug <txhash>` | |
debug() { | |
seth bundle-source $(seth tx $1 to) > tmp.json && \ # often might need to bundle other sources | |
seth run-tx $1 --source=tmp.json --debug && \ | |
rm tmp.json # <toContractName>.sol is often leftover, so delete that manually afterwards | |
} | |
# ABI encode values, and return encoded values without the function signature | |
# example: `abiEncode <sig> [<args>]` | |
abiEncode() { | |
x=$(seth calldata $@); | |
echo "0x${x:10}" # slice off the function signature, i.e. provided function name doesn't matter | |
} | |
# Returns the slot used to store the value of a Solidity mapping for a specified address | |
# example: `getSolidityAddressSlot <address> <mappingSlot>` | |
getSolidityAddressSlot() { | |
echo $(seth keccak $(abiEncode "x(address,uint256)" $1 $2)) | |
} | |
# Returns the slot used to store the value of a Vyper mapping for a specified address | |
# note: not guaranteed to work for all Vyper versions since storage layout is not yet stable. More info: https://twitter.com/big_tech_sux/status/1420159854170152963 | |
# example: `getVyperAddressSlot <address> <mappingSlot>` | |
getVyperAddressSlot() { | |
echo $(seth keccak $(abiEncode "x(uint256,address)" $2 $1)) | |
} |
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