EIP-5792 Integration for Scaffold-ETH 2

Prerequisites

Check if ./packages/nextjs/scaffold.config.ts exists directly in the current working directory (do not search subdirectories). If it doesn't exist, this is not a Scaffold-ETH 2 project. Follow the instructions at https://docs.scaffoldeth.io/SKILL.md to scaffold it first. If it exists, continue directly with building.

Overview

EIP-5792 (Wallet Call API) lets apps send batched onchain write calls to wallets via wallet_sendCalls. No new dependencies needed — SE-2 already includes wagmi, which has the EIP-5792 hooks at wagmi/experimental:

• useWriteContracts — batch multiple contract calls into one wallet request
• useCapabilities — detect what the connected wallet supports (batching, paymasters, etc.)
• useShowCallsStatus — ask the wallet to display status of a batch

Import paths are moving. useCapabilities and useShowCallsStatus have been promoted to wagmi (stable). useWriteContracts is still in wagmi/experimental as of early 2026. Always check the wagmi docs for the current import paths.

Smart Contract

EIP-5792 works with any contract — the point is batching multiple calls into a single wallet interaction. A simple contract with two or more state-changing functions works well for demonstrating batching:

contract BatchExample {
    string public greeting = "Hello!";
    uint256 public counter = 0;

    function setGreeting(string memory _newGreeting) public payable {
        greeting = _newGreeting;
    }

    function incrementCounter() public {
        counter += 1;
    }

    receive() external payable {}
}

Deploy using the project's existing deployment pattern (Hardhat deploy/ or Foundry script/).

EIP-5792 Integration Pattern

Detecting wallet support

Not all wallets support EIP-5792. Use useCapabilities to check before offering batch UI:

import { useCapabilities } from "wagmi/experimental";
import { useAccount } from "wagmi";

const { address, chainId } = useAccount();
const { isSuccess: isEIP5792Wallet, data: walletCapabilities } = useCapabilities({ account: address });

// Check specific capabilities per chain
const isPaymasterSupported = walletCapabilities?.[chainId]?.paymasterService?.supported;

isSuccess being true means the wallet responded to wallet_getCapabilities — i.e., it's EIP-5792 compliant.

Batching contract calls

Use useWriteContracts to send multiple calls in one wallet interaction. Get the contract ABI and address from SE-2's useDeployedContractInfo hook:

import { useWriteContracts } from "wagmi/experimental";
import { useDeployedContractInfo } from "~~/hooks/scaffold-eth";

const { data: deployedContract } = useDeployedContractInfo("YourContract");
const { writeContractsAsync, isPending } = useWriteContracts();

// Batch two calls
const result = await writeContractsAsync({
  contracts: [
    {
      address: deployedContract.address,
      abi: deployedContract.abi,
      functionName: "setGreeting",
      args: ["Hello from batch!"],
    },
    {
      address: deployedContract.address,
      abi: deployedContract.abi,
      functionName: "incrementCounter",
    },
  ],
  // Optional: add paymaster capability if supported by the wallet
  capabilities: isPaymasterSupported ? {
    paymasterService: { url: paymasterURL }
  } : undefined,
});

Showing batch status

import { useShowCallsStatus } from "wagmi/experimental";

const { showCallsStatusAsync } = useShowCallsStatus();
await showCallsStatusAsync({ id: batchId });

Wallet Compatibility & Graceful Fallback

Graceful degradation is critical. The UI must work for both EIP-5792 and non-EIP-5792 wallets:

• Use SE-2's useScaffoldWriteContract for individual calls as fallback
• Only show/enable the batch button when useCapabilities succeeds (isEIP5792Wallet)
• Consider a "switch to Coinbase Wallet" prompt for unsupported wallets

Capabilities vary by chain. Always check walletCapabilities?.[chainId] for the specific chain, not just whether the wallet is EIP-5792 compliant in general.

SE-2's burner wallet supports EIP-5792 with sequential (non-atomic) calls. Advanced capabilities like paymasters require a live testnet with a compliant wallet (Coinbase Wallet has the most complete implementation).

Paymaster integration (ERC-7677) is optional. If you want gas sponsorship, you need a paymaster service URL passed as a capability in the writeContracts call. The paymaster service is external to SE-2.

How to Test

1. Deploy the contract: yarn deploy
2. Start the frontend: yarn start
3. For basic batching: use any wallet on localhost (SE-2's burner wallet works)
4. For advanced capabilities (paymasters, atomic execution): deploy to a live testnet and connect with an EIP-5792 compliant wallet