Get Exchange Rate

const usdtPolygon = tokens.evm_tokens.find(
  (t) => t.symbol === "USDT" && t.chain === "137",
);
if (!usdtPolygon) throw new Error("USDT on Polygon not found");

const btcLightning = tokens.btc_tokens.find((t) => t.chain === "Lightning");
if (!btcLightning) throw new Error("BTC on Lightning not found");

// Quote: sell 100,000 sats (0.001 BTC) for USDT on Polygon
const sellBtcQuote = await client.getQuote({
  sourceChain: btcLightning.chain,
  sourceToken: btcLightning.token_id,
  targetChain: usdtPolygon.chain,
  targetToken: usdtPolygon.token_id,
  sourceAmount: 100_000, // 100,000 sats
});

console.log("\n=== Lightning BTC → USDT (Polygon) ===");
console.log(`  Selling:      100,000 sats (0.001 BTC)`);
console.log(
  `  You receive:  ${sellBtcQuote.target_amount} USDT smallest units`,
);
console.log(`  Exchange rate: ${sellBtcQuote.exchange_rate}`);
console.log(`  Network fee:  ${sellBtcQuote.network_fee} sats`);
console.log(
  `  Protocol fee: ${sellBtcQuote.protocol_fee} sats (${
    sellBtcQuote.protocol_fee_rate * 100
  }%)`,
);
console.log(
  `  Limits:       ${sellBtcQuote.min_amount}-${sellBtcQuote.max_amount} sats`,
);

// Quote: sell 50 USDT (50,000,000 smallest units) for Lightning BTC
const buyBtcQuote = await client.getQuote({
  sourceChain: usdtPolygon.chain,
  sourceToken: usdtPolygon.token_id,
  targetChain: btcLightning.chain,
  targetToken: btcLightning.token_id,
  sourceAmount: 50_000_000, // 50 USDT (6 decimals)
});

console.log("\n=== USDT (Polygon) → Lightning BTC ===");
console.log(`  Selling:      50 USDT`);
console.log(`  You receive:  ${buyBtcQuote.target_amount} sats`);
console.log(`  Exchange rate: ${buyBtcQuote.exchange_rate}`);
console.log(`  Network fee:  ${buyBtcQuote.network_fee} sats`);
console.log(
  `  Protocol fee: ${buyBtcQuote.protocol_fee} sats (${
    buyBtcQuote.protocol_fee_rate * 100
  }%)`,
);
console.log(
  `  Limits:       ${buyBtcQuote.min_amount}-${buyBtcQuote.max_amount} sats`,
);