Trace every on‑chain move
inside your agent's trace

import { createPublicClient, createWalletClient, http } from 'viem';
import { base } from 'viem/chains';
import { withHashspan } from '@hashspan/viem';

const hashspan = withHashspan();
const wallet = createWalletClient({ account, chain: base, transport: http() })
  .extend(hashspan);
const reader = createPublicClient({ chain: base, transport: http() })
  .extend(hashspan);

// Inside an agent tool: send + confirm spans appear under the tool span.
const hash = await wallet.sendTransaction({ to, value });
await reader.waitForTransactionReceipt({ hash });

import { CdpClient } from '@coinbase/cdp-sdk';
import { withHashspan } from '@hashspan/cdp';
import { createPublicClient, http } from 'viem';
import { baseSepolia } from 'viem/chains';

const cdp = new CdpClient();
const reader = createPublicClient({
  chain: baseSepolia,
  transport: http(),
});
const hashspan = withHashspan(cdp, { reader });

const account = await cdp.evm.getOrCreateAccount({ name: 'treasury' });
await account.sendTransaction({
  network: 'base-sepolia',
  transaction: { to, value },
}); // send + confirm spans

await hashspan.flush();

import { withHashspan } from '@hashspan/x402';
import { x402Client } from '@x402/core/client';
import { wrapFetchWithPayment } from '@x402/fetch';
import { createPublicClient, http } from 'viem';
import { baseSepolia } from 'viem/chains';

const client = new x402Client(); // register your payment scheme on it
const reader = createPublicClient({
  chain: baseSepolia,
  transport: http(),
});
const hashspan = withHashspan(client, { reader });

const pay = wrapFetchWithPayment(fetch, client);
await pay('https://api.example.com/weather'); // payment + confirm spans

await hashspan.flush();

import { createTxTracker } from '@hashspan/core';
import { context } from '@opentelemetry/api';

const tracker = createTxTracker({ agent: { name: 'treasury-bot' } });

const send = tracker.startSend({ chainId: 8453, from, to, value });
const hash = await context.with(send.context, () => sendSomehow());
send.end({ hash });

const confirm = tracker.startConfirm({ chainId: 8453, hash });
const receipt = await waitSomehow(hash);
confirm.end({ status: receipt.status, blockNumber: receipt.blockNumber, gasUsed: receipt.gasUsed });