ToolVet
80trust / 100

Data Balances

by NodeFlare in Onchain & crypto

x402 APIPassing, checked 3 h ago

Multi-chain balances API: native + ERC-20 token balances for one address across up to 17 EVM chains (Ethereum, Base, Arbitrum, Optimism, BNB, and young chains like Robinhood, Ink that Alchemy/Moralis omit) in a single request. Pay per call in USDC, no account or API key - built for AI agents. Priced about $0.0003 per chain.

POST https://rpc.nodeflare.app/data/balances/x402

Last 30 days

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Status and outage history · Atom feed

Uptime
100%
Response time
152 ms typical, 205 ms slowest 5%
Last check
3 h ago
Next check
any minute now

How to call it

POST https://rpc.nodeflare.app/data/balances/x402

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.

POST https://rpc.nodeflare.app/data/balances/x402
content-type: application/json

{
  "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
  "chains": [
    "ethereum",
    "base"
  ],
  "tokens": {
    "base": [
      "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
    ]
  }
}

Parameters

ParameterTypeRequiredDescription
addressstringYes
chainsarray of stringNo
tokensobjectNo

Example response

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

{
  "address": "0x...",
  "chains": [
    {
      "chain": "base",
      "chainId": 8453,
      "native": {
        "balance": "1.5",
        "currency": "ETH",
        "wei": "1500000000000000000"
      },
      "tokens": []
    }
  ]
}

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 -X POST 'https://rpc.nodeflare.app/data/balances/x402' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045","chains":["ethereum","base"],"tokens":{"base":["0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"]}}'

# 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 - -X POST 'https://rpc.nodeflare.app/data/balances/x402' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045","chains":["ethereum","base"],"tokens":{"base":["0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"]}}' \
  | 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%2Frpc.nodeflare.app%2Fdata%2Fbalances%2Fx402&method=POST
const res = await pay("https://rpc.nodeflare.app/data/balances/x402", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
    "chains": [
      "ethereum",
      "base"
    ],
    "tokens": {
      "base": [
        "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
      ]
    }
  }),
});
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.post(
        "https://rpc.nodeflare.app/data/balances/x402",
        json={
            "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
            "chains": [
                "ethereum",
                "base",
            ],
            "tokens": {
                "base": [
                    "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
                ],
            },
        },
    )
    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 agoPassed402157 ms$0.002
7 h agoPassed402163 ms$0.002
11 h agoPassed402152 ms$0.002
15 h agoPassed402132 ms$0.002
19 h agoPassed402125 ms$0.002
23 h agoPassed402131 ms$0.002
27 h agoPassed402130 ms$0.002
31 h agoPassed402205 ms$0.002
34 h agoPassed402252 ms$0.002