Get Exchange Rate

const quote = await client.getQuote("btc_lightning", "usdc_pol", 100000);

console.log("Rate:", quote.exchange_rate);
console.log("Network fee:", quote.network_fee, "sats");
console.log("Protocol fee:", quote.protocol_fee, "sats");
console.log("Min:", quote.min_amount, "sats");
console.log("Max:", quote.max_amount, "sats");

import { PriceFeedService } from "@lendasat/lendaswap-sdk-pure";

const priceFeed = new PriceFeedService("wss://apilendaswap.lendasat.com");

const unsubscribe = priceFeed.subscribe((update) => {
  console.log("Updated:", new Date(update.timestamp * 1000));
  for (const pair of update.pairs) {
    console.log(`${pair.pair}: tier_1=${pair.tiers.tier_1}`);
  }
});

// Call unsubscribe() when done, or priceFeed.close()

import {
  calculateSourceAmount,
  calculateTargetAmount,
  computeExchangeRate,
  selectTierRate,
} from "@lendasat/lendaswap-sdk-pure";

// Get rate for amount tier
const rate = selectTierRate(priceTiers, 100000);
const networkFee = 0.0001; // in BTC

// Compute the exchange rate (handles inversion for BTC→EVM)
const exchangeRate = computeExchangeRate(rate, true, true);

// Calculate: "I want to send 100k sats, how much USDC?"
const targetAmount = calculateTargetAmount(0.001, exchangeRate, networkFee, true, false);

// Calculate: "I want to receive 50 USDC, how many sats?"
const sourceAmount = calculateSourceAmount(50, exchangeRate, networkFee, true, false);