Imports github.com/deng00/req github.com/ethereum/go-ethereum/common github.com/ethereum/go-ethereum/common/hexutil github.com/ethereum/go-ethereum/core/types github.com/ethereum/go-ethereum/crypto github.com/ethereum/go-ethereum/ethclient github.com/shopspring/decimal Standard library imports context crypto/ecdsa encoding/json errors fmt math math/big strconv strings