Cargo.toml

[package]
name = "uniswap_v2_prices"
edition = "2021"

[dependencies]
alloy = { git = "https://github.com/alloy-rs/alloy", features = [
    "contract",
    "network",
    "providers",
    "rpc",
    "rpc-types",
    "rpc-types-eth",
    "transports",
    "provider-http",
    "provider-ws",
    "rpc-client",
    "pubsub"
] }
tokio = { version = "1.37.0", features = ["full"] }

output.md

$ cargo run
4462901919135589517858 / 2991078847897721207214 = 1

uniswap_v2_prices.rs

use alloy::network::Ethereum;
use alloy::providers::ReqwestProvider;
use alloy::{primitives::U256, sol};

sol!(
    #[allow(missing_docs)]
    #[sol(rpc)]
    IUniswapV2Pair,
    "UniswapV2Pair.json"
);

const RPC_URL: &str = "https://eth.merkle.io";
const POOL_ADDRESS: &str = "0x9C4Fe5FFD9A9fC5678cFBd93Aa2D4FD684b67C4C";

#[tokio::main]
async fn main() {
    let rpc_url = RPC_URL.parse().unwrap();
    let provider = ReqwestProvider::<Ethereum>::new_http(rpc_url);
    let pool_address = POOL_ADDRESS.parse().unwrap();

    let IUniswapV2Pair::getReservesReturn {
        _reserve0,
        _reserve1,
        _blockTimestampLast,
    } = IUniswapV2Pair::new(pool_address, provider)
        .getReserves()
        .call()
        .await
        .expect("failed to call getReserves");
    let reserves: (U256, U256) =
        (_reserve0.try_into().unwrap(), _reserve1.try_into().unwrap());
    println!(
        "{} / {} = {}",
        reserves.0,
        reserves.1,
        reserves.0 / reserves.1
    )
}