@flashbots/suave-viem NPM

:warning: ALPHA SOFTWARE: This code relies on the SUAVE protocol, and both are subject to change. Please use it with caution. The SUAVE spec has not yet stabilized, so we are refraining from merging this work upstream. We plan to do so when the time is right. Additionally, Confidential Compute Requests in their current form can only be signed with local accounts (using privateKey directly), or with EIP-1193 wallets using eth_sign.

Features

Abstractions over the JSON-RPC API to make your life easier
First-class APIs for interacting with Smart Contracts
Language closely aligned to official Ethereum terminology
Import your Browser Extension, WalletConnect or Private Key Wallet
Browser native BigInt, instead of large BigNumber libraries
Utilities for working with ABIs (encoding/decoding/inspection)
TypeScript ready (infer types from ABIs and EIP-712 Typed Data)
First-class support for Anvil, Hardhat & Ganache
Test suite running against forked Ethereum network

... and a lot lot more.

Overview

First, see these instructions for spinning up a local devnet. Then install @flashbots/suave-viem into your project and run this code:

import { http, type Hex } from '@flashbots/suave-viem';
import { suaveRigil } from '@flashbots/suave-viem/chains';
import {
  getSuaveProvider,
  getSuaveWallet,
  type TransactionRequestSuave,
  SuaveTxRequestTypes
} from '@flashbots/suave-viem/chains/utils';

// connect to a local SUAVE devnet
const SUAVE_RPC_URL = 'http://localhost:8545';
const suaveProvider = getSuaveProvider(http(SUAVE_RPC_URL));

// instantiate a wallet
const DEFAULT_PRIVATE_KEY: Hex =
  '0x91ab9a7e53c220e6210460b65a7a3bb2ca181412a8a7b43ff336b3df1737ce12';
const wallet = getSuaveWallet({
  transport: http(SUAVE_RPC_URL),
  privateKey: DEFAULT_PRIVATE_KEY,
});

// Watch for pending transactions
suaveProvider.watchPendingTransactions({
  async onTransactions(transactions) {
    for (const hash of transactions) {
      try {
        console.log(
          'Transaction Receipt:',
          await suaveProvider.getTransactionReceipt({hash})
        );
      } catch (error) {
        console.error('Error fetching receipt:', error);
      }
    }
  },
});

// send a confidential compute request
const ccr: TransactionRequestSuave = {
  confidentialInputs:
    '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',
  kettleAddress: '0xB5fEAfbDD752ad52Afb7e1bD2E40432A485bBB7F', // Address of your local Kettle. Use 0x03493869959C866713C33669cA118E774A30A0E5 if on Rigil.
  to: '0x8f21Fdd6B4f4CacD33151777A46c122797c8BF17',
  gasPrice: 10000000000n, // Gas price for the transaction
  gas: 420000n, // Gas limit for the transaction
  type: SuaveTxRequestTypes.ConfidentialRequest, // (0x43)
  chainId: suaveRigil.id,
  data: '0x236eb5a70000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000010000000000000000000000008f21fdd6b4f4cacd33151777a46c122797c8bf170000000000000000000000000000000000000000000000000000000000000000',
};

const res = await wallet.sendTransaction(ccr);
console.log(`sent ccr! tx hash: ${res}`);

See the docs for more detailed examples.