How-to: Use fast deposits

import { EthereumSepolia } from "@circle-fin/app-kit/chains";

const sourceChain = EthereumSepolia;
const tokenMessengerWithFees: string =
  "0x8745D906D67C346E5eb1aEEED38Eb87F34DF0C0A";
const maxUint256: bigint = 2n ** 256n - 1n;

function isEvmTransactionHash(value: string): value is `0x${string}` {
  return /^0x[0-9a-fA-F]{64}$/.test(value);
}

const approval = await adapter.prepareAction(
  "usdc.approve",
  { amount: maxUint256, delegate: tokenMessengerWithFees },
  { chain: sourceChain },
);

const approvalTransactionHash: string = await approval.execute();

if (!isEvmTransactionHash(approvalTransactionHash)) {
  throw new Error("The approval returned an invalid EVM transaction hash.");
}

type ApprovalReceipt = Awaited<ReturnType<typeof adapter.waitForTransaction>>;

const approvalReceipt: ApprovalReceipt = await adapter.waitForTransaction(
  approvalTransactionHash,
  { timeout: 60_000 },
  sourceChain,
);

if (approvalReceipt.status !== "success") {
  throw new Error("The USDC approval transaction reverted.");
}

const estimate = await kit.unifiedBalance.estimateDeposit({
  from: { adapter, chain: "Ethereum_Sepolia" },
  amount: "10",
  token: "USDC",
  to: { chain: "Arc_Testnet" },
  config: { transferSpeed: "FAST" },
});

console.log(estimate.fees);
// [
//   { type: 'gasFee',    token: 'ETH',  amount: '0.0012' },
//   { type: 'forwarder', token: 'USDC', amount: '0.50'   },
// ]

const result = await kit.unifiedBalance.deposit({
  ...estimate, // spreads amount, to, config, and quote
  from: { adapter, chain: "Ethereum_Sepolia" },
});

const estimate = await kit.unifiedBalance.estimateDeposit({
  from: { adapter, chain: "Ethereum_Sepolia" },
  amount: "1.00",
  token: "USDC",
  to: { chain: "Arc_Testnet" },
  config: { transferSpeed: "FAST" },
});

const result = await kit.unifiedBalance.depositFor({
  ...estimate, // spreads amount, to, config, and quote
  from: { adapter, chain: "Ethereum_Sepolia" },
  depositAccount: "0xDepositAccountAddress",
});

switch (result.progress?.status) {
  case "DONE":
    console.log("Deposited. Relay tx:", result.txHash);
    break;
  case "PENDING":
    console.log("Transfer in progress. Source tx:", result.txHash);
    break;
  case "FAILED":
    console.error(
      "Relay failed. Contact support with source tx:",
      result.txHash,
    );
    break;
}

{
  "amount": "1.00",
  "token": "USDC",
  "depositedTo": "0xDepositAccountAddress",
  "depositedBy": "0xSignerAddress",
  "chain": "Arc_Testnet",
  "txHash": "0x…",
  "explorerUrl": "https://testnet.arcscan.app/tx/0x…",
  "sourceChain": "Ethereum_Sepolia",
  "destinationChain": "Arc_Testnet",
  "fees": [
    { "type": "gasFee", "token": "ETH", "amount": "0.000689…" },
    { "type": "forwarder", "token": "USDC", "amount": "0.023517" }
  ],
  "progress": { "status": "DONE" }
}