const params = new URLSearchParams({
  tokenIn: '0xTokenA',
  tokenOut: '0xTokenB',
  amountIn: '1000000000000000000', // 1 token
  tradeType: '0'
});

const res = await fetch(`https://dex.kasplex.org/swap-api/api/v1/quote?${params}`);
const quote = await res.json();

console.log(`Price: 1 TokenA = ${quote.executionPrice} TokenB`);
console.log(`Price impact: ${quote.priceImpact}%`);

// Single token price
const res = await fetch('https://dex.kasplex.org/swap-api/api/v1/price/0xTokenAddress');

// Pair price
const res = await fetch('https://dex.kasplex.org/swap-api/api/v1/price/pair/0xToken0/0xToken1');

const PAIR_ABI = [
  'function getReserves() view returns (uint112, uint112, uint32)',
  'function token0() view returns (address)'
];

const pair = new ethers.Contract(pairAddress, PAIR_ABI, provider);
const [reserve0, reserve1] = await pair.getReserves();
const token0 = await pair.token0();

// Price of token0 in terms of token1
const price = Number(reserve1) / Number(reserve0);

const POOL_ABI = [
  'function slot0() view returns (uint160, int24, uint16, uint16, uint16, uint8, bool)'
];

const pool = new ethers.Contract(poolAddress, POOL_ABI, provider);
const [sqrtPriceX96, tick] = await pool.slot0();

// Convert sqrtPriceX96 to price
const price = (Number(sqrtPriceX96) / 2 ** 96) ** 2;

// Adjust for decimals if tokens have different decimal places
const adjustedPrice = price * (10 ** (decimals0 - decimals1));

const res = await fetch(
  'https://dex.kasplex.org/swap-api/api/v1/price/history/0xPoolAddress?limit=100'
);