Across for Stablecoins

const params = new URLSearchParams({
  tradeType: "minOutput",
  originChainId: "42161",        // Arbitrum
  destinationChainId: "1337",    // HyperEVM
  inputToken: "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",  // USDC on Arbitrum
  outputToken: "0x...",          // USDH on HyperEVM
  amount: "1000000000",
  depositor: "0xYourWalletAddress",
});

const response = await fetch(
  `https://app.across.to/api/swap/approval?${params}`,
  {
    headers: {
      Authorization: "Bearer YOUR_API_KEY",
    },
  }
);
const quote = await response.json();

console.log("Total fees:", quote.fees?.total);
// Sponsored routes: "0"

import { createWalletClient, createPublicClient, http } from "viem";
import { mainnet } from "viem/chains";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount("0xYOUR_PRIVATE_KEY");
const walletClient = createWalletClient({
  account,
  chain: mainnet,
  transport: http(),
});
const publicClient = createPublicClient({
  chain: mainnet,
  transport: http(),
});

// 5,000,000 USDC (6 decimals)
const amount = "5000000000000";

const params = new URLSearchParams({
  tradeType: "minOutput",
  originChainId: "1",
  destinationChainId: "42161",
  inputToken: "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",   // USDC on Ethereum
  outputToken: "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",   // USDC on Arbitrum
  amount,
  depositor: account.address,
});

const response = await fetch(
  `https://app.across.to/api/swap/approval?${params}`,
  {
    headers: {
      Authorization: "Bearer YOUR_API_KEY",
    },
  }
);
const quote = await response.json();

// Check which settlement mechanism the API selected
console.log("Cross-swap type:", quote.crossSwapType);
console.log("Expected fill time:", quote.expectedFillTime, "seconds");

// Execute approvals
if (quote.approvalTxns?.length) {
  for (const approvalTx of quote.approvalTxns) {
    const hash = await walletClient.sendTransaction({
      to: approvalTx.to,
      data: approvalTx.data,
    });
    await publicClient.waitForTransactionReceipt({ hash });
  }
}

// Execute the swap
const hash = await walletClient.sendTransaction({
  to: quote.swapTx.to,
  data: quote.swapTx.data,
  value: quote.swapTx.value ? BigInt(quote.swapTx.value) : 0n,
});

console.log("Transfer tx:", hash);