USDC balance

Read the USDC balance of any address on Base, Polygon, Arbitrum, Optimism, or Ethereum. Read-only on-chain call. ?address=0x…&network=base

Input

Field	Type	Description
address *	string	0x EVM address
network	string	chain: base | polygon | arbitrum | optimism | ethereum (default base)

Example output

{
  "address": "0x…",
  "usdc": "12.5",
  "raw": "12500000",
  "token": "USDC",
  "network": "base"
}

Try it — see the 402 challenge (free)

curl -i "https://agent402.tools/api/usdc-balance?address=0xaBF4FAbd7c416fB67202E5f9002389Fc75e2a9D0&network=base"

The response is HTTP 402 Payment Required with exact payment requirements. Any x402 v2 client pays automatically and retries:

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/usdc-balance?address=0xaBF4FAbd7c416fB67202E5f9002389Fc75e2a9D0&network=base");

Wallet-only. This tool reaches the network/browser/storage, so it is paid in USDC via x402 (no proof-of-work tier).

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