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Wallet Balance

by Wallet balance (native + ERC-20) in Onchain & crypto

x402 APIPassing, checked 4 h ago

Look up the native coin balance (ETH/MATIC) plus every ERC-20 holding for a wallet address on Ethereum, Base, Polygon, Arbitrum, or Optimism. Returns clean decimal balances (already scaled by token decimals) plus symbol and contract - ready to display in a UI or feed into a portfolio tool.

POST https://agent402.tools/api/wallet-balance

Last 30 days

All checks passedSome failedAll failedNot checked
Uptime
100%
Response time
190 ms typical, 190 ms slowest 5%
Last check
4 h ago
Next check
any minute now

How to call it

# See the payment challenge (nothing is charged)
curl -i -X POST "https://agent402.tools/api/wallet-balance" \
  -H "content-type: application/json" \
  -d '{"address":"0xaBF4FAbd7c416fB67202E5f9002389Fc75e2a9D0","network":"base"}'
import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client().register(
  "eip155:8453",
  new ExactEvmScheme(privateKeyToAccount(process.env.AGENT_KEY)),
);
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? Preflight it first for $0.005:
// GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagent402.tools%2Fapi%2Fwallet-balance
const res = await pay("https://agent402.tools/api/wallet-balance", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({"address":"0xaBF4FAbd7c416fB67202E5f9002389Fc75e2a9D0","network":"base"}),
});
console.log(await res.json());

Example input

{
  "address": "0xaBF4FAbd7c416fB67202E5f9002389Fc75e2a9D0",
  "network": "base"
}

Example output

{
  "address": "0xabf4fabd7c416fb67202e5f9002389fc75e2a9d0",
  "native": {
    "balance": "0.001234",
    "raw": "1234000000000000",
    "symbol": "ETH"
  },
  "network": "base",
  "tokens": [
    {
      "balance": "100",
      "contract": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
      "decimals": 6,
      "raw": "100000000",
      "symbol": "USDC"
    }
  ]
}

Security scan

  • No findings. We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
4 h agoPassed402190 ms$0.002