Everything on pons, one call away.

import { createPublicClient, http, erc20Abi } from "viem";

const rpc = createPublicClient({ transport: http(RPC_URL) });

// 1. find the pool the launch created
const pool = await rpc.readContract({
  address: token, abi: tokenAbi, functionName: "liquidityPool",
});

// 2. read the price as a Q64.96 fixed-point square root
const [sqrtPriceX96] = await rpc.readContract({
  address: pool, abi: poolAbi, functionName: "slot0",
});

// 3. figure out which side of the pair the token is on
const token0 = await rpc.readContract({
  address: pool, abi: poolAbi, functionName: "token0",
});

// 4. undo the square root, mind the orientation and the decimals
const ratio = (Number(sqrtPriceX96) / 2 ** 96) ** 2;
const priceEth =
  token.toLowerCase() === token0.toLowerCase() ? ratio : 1 / ratio;

// 5. circulating supply is total minus whatever was burned
const [supply, burned] = await Promise.all([
  rpc.readContract({ address: token, abi: erc20Abi, functionName: "totalSupply" }),
  rpc.readContract({
    address: token, abi: erc20Abi, functionName: "balanceOf",
    args: ["0x000000000000000000000000000000000000dEaD"],
  }),
]);

// 6. and an ETH price, which is not on this chain at all
const ethUsd = await fetch(SOME_PRICE_FEED).then((r) => r.json());

const mcapUsd = (Number(supply - burned) / 1e18) * priceEth * ethUsd;

const { priceUsd, mcapUsd, fdvUsd } = await fetch(
  "https://api.ponsapi.dev/v1/tokens/0x39dBED3a2bd333467115dE45665cC57F813C4571/price",
).then((r) => r.json());