Execute Base Earn Calls in a Wallet

// Browser-side wallet integration. The API helper runs on your backend.
import { createWalletClient, custom } from "viem";
import { base } from "viem/chains";
const wallet = createWalletClient({ chain: base, transport: custom(window.ethereum) });

async function execute(batch) {
  const accounts = await wallet.getAddresses();
  if (!accounts.some(a => a.toLowerCase() === batch.from.toLowerCase()))
    throw new Error("Wrong connected account");
  if (BigInt(batch.chainId) !== 8453n || await wallet.getChainId() !== 8453)
    throw new Error("Switch to Base mainnet");
  const { id } = await wallet.sendCalls({
    account: batch.from,
    version: batch.version,
    forceAtomic: batch.atomicRequired === true,
    experimental_fallback: false,
    ...(batch.capabilities === undefined ? {} : { capabilities: batch.capabilities }),
    calls: batch.calls.map(c => ({ to: c.to, data: c.data, value: BigInt(c.value) })),
  });
  return wallet.waitForCallsStatus({ id, throwOnFailure: true });
}

import { createPublicClient, http } from "viem";
const publicClient = createPublicClient({ chain: base, transport: http() });

async function executeSequential(batch) {
  if (batch.atomicRequired || Object.keys(batch.capabilities ?? {}).length)
    throw new Error("This plan needs a capability-aware batch wallet");
  const accounts = await wallet.getAddresses();
  if (!accounts.some(a => a.toLowerCase() === batch.from.toLowerCase()))
    throw new Error("Wrong connected account");
  if (BigInt(batch.chainId) !== 8453n || await wallet.getChainId() !== 8453)
    throw new Error("Switch to Base mainnet");
  const receipts = [];
  for (const c of batch.calls) {
    const hash = await wallet.sendTransaction({
      account: batch.from, to: c.to, data: c.data, value: BigInt(c.value),
    });
    const receipt = await publicClient.waitForTransactionReceipt({ hash });
    if (receipt.status !== "success") throw new Error(`Transaction failed: ${hash}`);
    receipts.push(receipt);
  }
  return receipts;
}