ToolVet
77trust / 100

Base Balances

by 1gateway in Onchain & crypto

x402 APIPassing, checked 3 h ago

Use when an agent needs what a Base address holds in one call instead of one RPC call per token. Input: address; optional tokens (up to 20 ERC-20 addresses, comma-separated; default USDC, EURC, USDbC, WETH, cbBTC, cbETH, wstETH). Output: JSON block+time, ETH balance, per-token symbol, decimals, raw and decimal balance, nonce, isContract. Chain state only, no prices. Bad input: 400, not charged. Example: ?address=0x6246eee0355Dd7A93C888fE59e1151388A0cC5a1

GET https://1gateway.dev/v1/onchain/base/balances

Last 30 days

All checks passedSome failedAll failedNot checked
Uptime
100%
Response time
660 ms typical, 963 ms slowest 5%
Last check
3 h ago
Next check
any minute now

How to call it

GET https://1gateway.dev/v1/onchain/base/balances

Each call costs $0.002 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

GET https://1gateway.dev/v1/onchain/base/balances?address=0x6246eee0355Dd7A93C888fE59e1151388A0cC5a1&tokens=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913%2C0x4200000000000000000000000000000000000006

Parameters

ParameterTypeRequiredDescription
addressstringYesWallet or contract on Base mainnet (0x + 40 hex; mixed case must be a valid EIP-55 checksum). Bad input → 400 (not charged)
tokensstringNoUp to 20 comma-separated ERC-20 contract addresses on Base. Omit for the default set. A contract that is not an ERC-20 is listed with status not_an_erc20.

Example response

The provider's example. We can't check it without paying.

Example response, 34 lines
{
  "address": "0x6246eee0355Dd7A93C888fE59e1151388A0cC5a1",
  "block": {
    "number": 52515381,
    "timestamp": "2026-10-12T15:48:29.000Z"
  },
  "chain": "base",
  "chainId": 8453,
  "codeSize": 0,
  "eth": {
    "balance": 0.016974638846759017,
    "wei": "16974638846759016"
  },
  "isContract": false,
  "nonZeroTokens": 1,
  "note": "Balances are raw chain state at the stated block. No prices, no USD values. The default token set is a short curated list; pass tokens= to check others.",
  "rpc": {
    "kind": "public",
    "source": "base-rpc.publicnode.com"
  },
  "tokenSet": "default",
  "tokens": [
    {
      "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "balance": 0.5179,
      "decimals": 6,
      "issuer": "Circle",
      "raw": "517900",
      "status": "ok",
      "symbol": "USDC"
    }
  ],
  "transactionCount": 7
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.002.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://1gateway.dev/v1/onchain/base/balances?address=0x6246eee0355Dd7A93C888fE59e1151388A0cC5a1&tokens=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913%2C0x4200000000000000000000000000000000000006'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://1gateway.dev/v1/onchain/base/balances?address=0x6246eee0355Dd7A93C888fE59e1151388A0cC5a1&tokens=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913%2C0x4200000000000000000000000000000000000006' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.002 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.002" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.002 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2F1gateway.dev%2Fv1%2Fonchain%2Fbase%2Fbalances
const res = await pay("https://1gateway.dev/v1/onchain/base/balances?address=0x6246eee0355Dd7A93C888fE59e1151388A0cC5a1&tokens=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913%2C0x4200000000000000000000000000000000000006");
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.002 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.002"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://1gateway.dev/v1/onchain/base/balances?address=0x6246eee0355Dd7A93C888fE59e1151388A0cC5a1&tokens=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913%2C0x4200000000000000000000000000000000000006")
    print(res.status_code, res.text)

Security scan

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

Recent checks

WhenResultHTTPTimePrice
3 h agoPassed402732 ms$0.002
7 h agoPassed402478 ms$0.002
11 h agoPassed402499 ms$0.002
15 h agoPassed402935 ms$0.002
19 h agoPassed402963 ms$0.002
23 h agoPassed402789 ms$0.002
26 h agoPassed402971 ms$0.002
30 h agoPassed402525 ms$0.002
33 h agoPassed402123 ms$0.002
37 h agoPassed402660 ms$0.002