etherscan-api

Golang client for the Etherscan.io v2 API with nearly full implementation(accounts, transactions, tokens, contracts, blocks, stats) and minimal dependencies.

Usage

go get github.com/TokenTax/etherscan-api/v2

Create an API instance and off you go. 🚀

import (
	"github.com/TokenTax/etherscan-api/v2/pkg/client"
	"github.com/TokenTax/etherscan-api/v2/pkg/chain"
	"fmt"
)

func main() {
	// create a API client for specified ethereum net
	// there are many pre-defined network in package
	client := client.NewClient(chain.EthereumMainnet, "[your API key]")

	// or, if you are working with antoher chain
	// client := client.NewClient(chain.OpMainnet, "[your API key]")
	//
	// or more customized
	// client := etherscan.NewCustomized(etherscan.Customization{
	// Timeout:       15 * time.Second,
	// Key:           "You key here",
	// Chain:         chain.NewChain(<chain number>),
	// BaseURL:       "<whatever thid-party api provider>",
	// Verbose:       false,
	// })

	// (optional) add hooks, e.g. for rate limit
	client.BeforeRequest = func(module, action string, values url.Values) error {
		// ...
	}
	client.AfterRequest = func(module, action string, values url.Values, outcome interface{}, requestErr error) 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

This library is not affiliated with Etherscan.io, it's developed for internal use in TokenTax.

License

Use of this work is governed by an MIT License.