49. Interacting with Vyper contracts from a dApp

A front end needs the deployed address and ABI to build a contract instance, then calls read (`view`) functions freely and prompts the user's wallet to sign write (state-changing) transactions.

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

const contract = getContract({
  address: "0xYourContract",
  abi: vyperAbi,
  client: publicClient,
});

const rate = await contract.read.rate();

Writes go through the user's wallet (e.g. MetaMask) so they can review gas cost and the exact calldata before signing — the dApp never has custody of the user's private key.

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