Description:

web3 cloud sdk

Web3 Client SDK #
Flutter based sdk that provides below wallet functions:

generate mnemonic
get mnemonic
import mnemonic
destroy mnemonic
get address
get balance
create & sign transaction
send transaction

Usage #
Generate mnemonic
import 'package:web3_cloud_sdk/client_sdk.dart' as clientsdk;

// strength can be set in 2nd param between 128 - 256
// strength should be either of 128, 160, 192, 224, 256 bits
// 128 => 12 words
// 256 => 24 words
final mnemonic = await clientsdk.generateMnemonic(walletId, 256);
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Create wallet
import 'package:web3_cloud_sdk/client_sdk.dart' as clientsdk;
import 'package:web3_cloud_sdk/ethereum_lib.dart' as ethereum;

final networkParam = ethereum.NetworkParam(
clientsdk.ChainId.ethereumGoerli,
clientsdk.NetworkId.ethereumGoerli,
dotenv.env['ETH_RPC_URL_GOERLI']!);

final sdk = clientsdk.SdkBase();
final wallet = await sdk.evm.createWallet(walletId, networkParam);
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Get balance
import 'package:web3_cloud_sdk/ethereum_lib.dart' as ethereum;

// get ether balance
// account index: 0 - 4294967295
final etherBalance = await wallet.account(0).balance();

// get LINK balance on goerli testnet
final ftBalance = await wallet.account(0).ftBalance(ethereum.Erc20ContractAddress.goerliLink);
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Sign transaction (transfer ether)
import 'package:web3_cloud_sdk/client_sdk.dart' as clientsdk;
import 'package:web3_cloud_sdk/ethereum_lib.dart' as ethereum;

final signedTx = await ethereum.TxBuilder()
.value(ethereum.etherToWei('0.0001'))
.gasPrice('80000000000') // 80 Gwei
.gasLimit(21000)
.to(dotenv.env['TO_ADDRESS']!)
.chainId(clientsdk.ChainId.ethereumGoerli)
.nonce(1) // optional: nonce will be taken from the connected node when not specified
.sign(wallet.account(0))
.build();
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Sign transaction (transfer erc20)
import 'package:web3_cloud_sdk/client_sdk.dart' as clientsdk;
import 'package:web3_cloud_sdk/ethereum_lib.dart' as ethereum;

// erc20 contract
final erc20Contract = ethereum.Erc20Contract(ethereum.Erc20ContractAddress.goerliLink);

final signedTx = await ethereum.TxBuilder()
.value('0')
.gasPrice('80000000000') // 80 Gwei
.gasLimit(250000)
.to(ethereum.Erc20ContractAddress.goerliLink)
.chainId(clientsdk.ChainId.ethereumGoerli)
.data(erc20Contract.transfer('to address', ethereum.etherToWei('0.01'))) // 0.01 LINK
.nonce(1) // optional: nonce will be taken from the connected node when not specified
.sign(wallet.account(0))
.build();
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Sign transaction (transfer NFT)
import 'package:web3_cloud_sdk/client_sdk.dart' as clientsdk;
import 'package:web3_cloud_sdk/ethereum_lib.dart' as ethereum;

// erc721 contract
final erc721Contract = ethereum.Erc721Contract('erc721 contract address');

final signedTx = await ethereum.TxBuilder()
.value('0')
.gasPrice('80000000000') // 80 Gwei
.gasLimit(250000)
.to(ethereum.Erc721ContractAddress.test)
.chainId(clientsdk.ChainId.ethereumGoerli)
.data(erc721Contract.safeTransferFrom('from addresss', 'to address', 1))
.nonce(1) // optional: nonce will be taken from the connected node when not specified
.sign(wallet.account(0))
.build();
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Send transaction
final txHash = await wallet.web3.sendTransaction(signedTx);
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License

For personal and professional use. You cannot resell or redistribute these repositories in their original state.

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