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etherscan-api

Golang client for the Etherscan.io API(and its families like BscScan), with nearly full implementation(accounts, transactions, tokens, contracts, blocks, stats), full network support(Mainnet, Ropsten, Kovan, Rinkby, Goerli, Tobalaba), and only depending on standard library.

Usage

go get github.com/nanmu42/etherscan-api

Create an API instance and off you go.

import (
    "github.com/nanmu42/etherscan-api"
    "fmt"
)
func main() {
    // create a API client for specified ethereum net
    // there are many pre-defined network in package
    client := etherscan.New(etherscan.Mainnet, "[your API key]")
    // or, if you are working with etherscan-family API like BscScan
    //
    // client := etherscan.NewCustomized(etherscan.Customization{
    // Timeout:       15 * time.Second,
    // Key:           "You key here",
    // BaseURL:       "https://api.bscscan.com/api?",
    // Verbose:       false,
    // })
    // (optional) add hooks, e.g. for rate limit
    client.BeforeRequest = func(module, action string, param map[string]interface{}) error {
        // ...
    }
    client.AfterRequest = func(module, action string, param map[string]interface{}, outcome interface{}, requestErr error) {
        // ...
    }
    // check account balance
    balance, err := client.AccountBalance("0x281055afc982d96fab65b3a49cac8b878184cb16")
    if err != nil {
        panic(err)
    }
    // balance in wei, in *big.Int type
    fmt.Println(balance.Int())
    // check token balance
    tokenBalance, err := client.TokenBalance("contractAddress", "holderAddress")
    // check ERC20 transactions from/to a specified address
    transfers, err := client.ERC20Transfers("contractAddress", "address", startBlock, endBlock, page, offset)
}

You may find full method list at GoDoc.

Etherscan API Key

You may apply for an API key on etherscan.

The Etherscan Ethereum Developer APIs are provided as a community service and without warranty, so please just use what you need and no more. They support both GET/POST requests and a rate limit of 5 requests/sec (exceed and you will be blocked).

Paperwork Things

I am not from Etherscan and I just find their service really useful, so I implement this.

License

Use of this work is governed by an MIT License.

You may find a license copy in project root.