Create Quote

1. Create Quote → Get depositAddress + payment details
2. Display confirmation screen to user (show rates, fees, estimated time)
3. User confirms → Send tokens to depositAddress on-chain
4. Poll /verify-transfer → Wait for payment confirmation

import { ethers } from 'ethers';

// Step 1: Create quote
const quoteRes = await fetch('https://api.stableyard.fi/sdk/v1/quote', {
  method: 'POST',
  headers: {
    'Authorization': 'Basic ' + btoa(STABLEYARD_APP_ID),
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    amount: 6.00,
    sourceChainId: 8453,  // Base
    destinationPaymentAddress: 'merchant@stableyard'
  })
});
const quote = await quoteRes.json();

// Step 2: Display confirmation to user
const { quoteData, payload } = quote.data;
console.log('Deposit Address:', quoteData.depositAddress);
console.log('You send:', payload.tokenIn.inputTokenAmountRawFormatted, 'USDC');
console.log('Recipient gets:', payload.tokenOut.outputTokenAmountRawFormatted, 'USDC');
console.log('Exchange rate:', payload.exchangeRate);
console.log('Estimated time:', payload.estimatedTime, 'seconds');

// Step 3: User confirms - send tokens on-chain
const provider = new ethers.BrowserProvider(window.ethereum);
const signer = await provider.getSigner();
const tokenContract = new ethers.Contract(
  payload.tokenIn.address,
  ['function transfer(address to, uint256 amount) returns (bool)'],
  signer
);

const tx = await tokenContract.transfer(
  quoteData.depositAddress,
  payload.tokenIn.inputTokenAmountRaw
);
await tx.wait();

// Step 4: Poll for payment confirmation
const pollPayment = async (quoteId: string) => {
  while (true) {
    const res = await fetch(
      `https://api.stableyard.fi/sdk/v1/verify-transfer?quoteId=${quoteId}`,
      { headers: { 'Authorization': 'Basic ' + btoa(STABLEYARD_APP_ID) } }
    );
    const result = await res.json();

    if (result.success && result.data?.isTransferDone) {
      console.log('Payment complete!');
      return result.data;
    }

    // Wait 2 seconds before next poll
    await new Promise(r => setTimeout(r, 2000));
  }
};

const confirmation = await pollPayment(quoteData.quoteId);