import { createModularAccountAlchemyClient } from "@alchemy/aa-alchemy";
import { LocalAccountSigner, sepolia } from "@alchemy/aa-core";
import { http } from "viem";

const client = await createModularAccountAlchemyClient({
  apiKey: "YOUR_ALCHEMY_API_KEY",
  chain: sepolia,
  signer: LocalAccountSigner.privateKeyToAccountSigner(privateKey),
  gasManagerConfig: {
    policyId: "YOUR_GAS_POLICY_ID",
  },
});

// Отправка user operation без ETH на кошельке
const { hash } = await client.sendUserOperation({
  uo: {
    target: contractAddress,
    data: encodeFunctionData({
      abi,
      functionName: "mint",
      args: [],
    }),
    value: 0n,
  },
});

await client.waitForUserOperationTransaction({ hash });

After integration, the user doesn't notice that the transaction is paid—everything is covered by the dApp. Our clients save up to 40% on gas thanks to optimal policies.

React Hooks

Account Kit provides @alchemy/aa-alchemy/react with ready-to-use hooks:

import {
  AlchemyAccountProvider,
  useSmartAccountClient,
  useSendUserOperation,
} from "@alchemy/aa-alchemy/react";

function MintButton() {
  const { client } = useSmartAccountClient({ type: "ModularAccount" });
  const { sendUserOperation, isSendingUserOperation } = useSendUserOperation({
    client,
    waitForTxn: true,
  });

  return (
    <button
      onClick={() =>
        sendUserOperation({
          uo: {
            target: NFT_ADDRESS,
            data: mintCalldata,
            value: 0n,
          },
        })
      }
      disabled={isSendingUserOperation}
    >
      {isSendingUserOperation ? "Minting..." : "Mint NFT"}
    </button>
  );
}

Session Keys

Account Kit supports session keys—temporary keys with limited permissions. The user approves the session key once, then the app can execute transactions without requesting a signature each time:

const sessionKey = await client.createSessionKey({
  expirationTime: Math.floor(Date.now() / 1000) + 3600, // 1 hour
  permissions: [
    {
      type: "contract",
      address: GAME_CONTRACT,
      functionSelectors: [MOVE_SELECTOR, ATTACK_SELECTOR], // only specific functions
    },
  ],
  spendingLimit: parseEther("0.01"), // max 0.01 ETH per session
});

This is especially valuable for games and applications with frequent small transactions.

How We Integrate Account Kit: Step-by-Step Process

The entire cycle takes 1–2 weeks. We include documentation with code examples and team training.

What's Included in the Service

• Selection and customization of smart account (Light or Modular) — turnkey
• Gas Manager setup with sponsorship policies
• Integration with existing auth (email, social, Web3)
• Adaptation of React UI to Account Kit hooks
• Testing on testnet and mainnet
• Documentation and storybook of components

We have done dozens of integrations for DeFi protocols and NFT marketplaces. Alchemy Account Kit is a mature tool but requires deep understanding of ERC-4337. Get a free assessment of your project—contact us.

Typical Integration Mistakes

When integrating, it's important to avoid: using LocalAccountSigner in production (not safe—replace with Web3Auth or WalletConnect); neglecting nonce management (different from EOA); failing to test Gas Manager policies to prevent budget overruns. We account for these points in every project.

Order your integration today to boost your dApp's conversion. Contact us to discuss details.