Fetching Ham Tips for a Cast

You can query Ham chain directly to get all tips given to a specific cast. To do so you can utilize event logs emitted when Ham tips are sent on Ham chain.

Here's a Typescript example using the library Viem. This will return the total amount of $HAM tipped on the cast with hash parentId.

import { createPublicClient, http, parseAbiItem, toHex } from "viem";

const RPC_URL = "https://rpc.ham.fun";

// Farcaster message hash
const parentId = toHex("0x2271d9e51802df8dd5ea18f959ed3bcaabd672d3");

async function getLogsViem() {
  const client = createPublicClient({
    transport: http(RPC_URL),
  });

  const logs = await client.getLogs({
    address: "0x7a6B7Ad9259c57fD599E1162c6375B7eA63864e4",
    event: parseAbiItem(
      "event MessagePaid(uint256 indexed from, uint256 indexed to, string indexed parentId, uint256 amount, string messageId)"
    ),
    fromBlock: "earliest",
    toBlock: "latest",
    args: {
      parentId: parentId,
    },
  });
  return logs;
}

const run = async () => {
  const logs = await getLogsViem();
  const total = logs.reduce((a, b) => {
    a += b.args.amount!;
    return a;
  }, 0n);
  console.log(`Total tipped on cast ${(total / BigInt(10 ** 18)).toString()}`);
};

run().then(() => {
  process.exit(0);
});