web3dart 0.2.0

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  • Changelog
  • Example
  • Installing
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web3dart #

A library for making transactions in Ethereum using Dart. This library is in early development, has not been through a security audit and should not be used in a productive environment.

Features #

  • Send valid and signed transactions to an Ethereum client using the JSON-RPC API.
  • Generate private keys and Ethereum accounts
  • (sort of) Send messages and function calls to smart contracts


  • Code generation based on smart contract ABI for easier interaction
  • Smart Contract events
  • Encode all supported solidity types

Usage #

In order to use this library, you will need an client connected to Ethereum nodes so that your transactions can actually be processed. You can either set up a local, private blockchain (by for instance using truffle and ganache), run an Ethereum node yourself (for instance with geth), or use a public RPC API, like infura.

import 'package:http/http.dart'; //You can also import the browser version
import 'package:web3dart/web3dart.dart';

main() {
    //Replace with private key of an account that can transfer ether
    var privateKeyHex = "c87509a1c067bbde78beb793e6fa76530b6382a4c0241e5e4a9ec0a0f44dc0d3";
    var apiUrl = "http://localhost:7545"; //Replace with your API

    var httpClient = new Client();

    var credentials = Credentials.fromHexPrivateKey(privateKeyHex);
    var client = new Web3Client(apiUrl, httpClient);

    //Set up a new transaction
    new Transaction(keys: credentials, maximumGas: 100000)
    .prepareForSimpleTransaction( //that will transfer 2 ether
        EtherAmount.fromUnitAndValue(EtherUnit.ETHER, 2))
    .send(client); //and send.

Feature requests and bugs #

Please file feature requests and bugs at the issue tracker.

Changelog #

0.2 #

  • Send transactions and call messages from smart contracts on the Blockchain.

0.1 #

  • Create new Ethereum accounts

0.0.2 #

  • Send and sign transactions

0.0.1 #

  • Initial version, created by Stagehand


import 'package:http/http.dart';
import 'package:web3dart/web3dart.dart';

const String _PRIVATE_KEY = "c87509a1c067bbde78beb793e6fa76530b6382a4c0241e5e4a9ec0a0f44dc0d3";
const String _URL = "http://localhost:7545";

main() async {
	var httpClient = new Client();
	Web3Client client = new Web3Client(_URL, httpClient);
	client.printErrors = true;

	var credentials = Credentials.fromHexPrivateKey(_PRIVATE_KEY);

	//Set up a new transaction
	new Transaction(keys: credentials, maximumGas: 100000)
		.prepareForSimpleTransaction( //that will transfer 2 ether
			EtherAmount.fromUnitAndValue(EtherUnit.ETHER, 2))
		.send(client); //and send.

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  web3dart: ^0.2.0

2. Install it

You can install packages from the command line:

with pub:

$ pub get

Alternatively, your editor might support pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:web3dart/web3dart.dart';
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Learn more about scoring.

The package version is not analyzed, because it does not support Dart 2. Until this is resolved, the package will receive a health and maintenance score of 0.

Analysis issues and suggestions

Support Dart 2 in pubspec.yaml.

The SDK constraint in pubspec.yaml doesn't allow the Dart 2.0.0 release. For information about upgrading it to be Dart 2 compatible, please see https://dart.dev/dart-2#migration.

Maintenance issues and suggestions

Make sure dartdoc successfully runs on your package's source files. (-10 points)

Dependencies were not resolved.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=1.20.1 <2.0.0