ToolVet
77trust / 100

Erc20 Balance Call

by hcrb.in in Onchain & crypto

x402 APIPassing, checked 1 h ago

Raw and formatted ERC-20 balanceOf for an address on Base, with decimals read from the token. Result carries a signed receipt.

POST
https://hcrb.in/v1/tools/erc20-balance/call
Price
$0.005
per call in USDC
Uptime
100%
last 30 days
Response time
588 ms
1.2 s slowest 5%
Last check
Passed
1 h ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed · Watch with other listings

How to call it

POST https://hcrb.in/v1/tools/erc20-balance/call

Each call costs $0.005 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://hcrb.in/v1/tools/erc20-balance/call
content-type: application/json

{
  "input": {
    "address": "0xc59c85e661d34084a7769f955d17fd38254a6235",
    "token_address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
  }
}

Parameters

ParameterTypeRequiredDescription
inputobjectYes

Example response

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

{
  "address": "0x0000000000000000000000000000000000000000",
  "balance": 0,
  "balance_raw": "0",
  "decimals": 6,
  "token_address": "0x0000000000000000000000000000000000000000",
  "valid": true
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.005.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://hcrb.in/v1/tools/erc20-balance/call' \
  -H 'content-type: application/json' \
  --data-raw '{"input":{"address":"0xc59c85e661d34084a7769f955d17fd38254a6235","token_address":"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://hcrb.in/v1/tools/erc20-balance/call' \
  -H 'content-type: application/json' \
  --data-raw '{"input":{"address":"0xc59c85e661d34084a7769f955d17fd38254a6235","token_address":"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 $0.005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.005" });
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 $0.005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fhcrb.in%2Fv1%2Ftools%2Ferc20-balance%2Fcall&method=POST
const res = await pay("https://hcrb.in/v1/tools/erc20-balance/call", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "input": {
      "address": "0xc59c85e661d34084a7769f955d17fd38254a6235",
      "token_address": "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 $0.005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.005"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://hcrb.in/v1/tools/erc20-balance/call",
        json={
            "input": {
                "address": "0xc59c85e661d34084a7769f955d17fd38254a6235",
                "token_address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
            },
        },
    )
    print(res.status_code, res.text)

Security scan

No findings

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Recent checks

WhenResultHTTPTimePrice
1 h agoPassed402591 ms$0.005
7 h agoPassed402582 ms$0.005
12 h agoPassed402562 ms$0.005
17 h agoPassed402572 ms$0.005
21 h agoPassed402588 ms$0.005
Show 8 older checks
26 h agoPassed4021.2 s$0.005
31 h agoPassed402693 ms$0.005
35 h agoPassed402618 ms$0.005
40 h agoPassed402461 ms$0.005
44 h agoPassed402560 ms$0.005
2 days agoPassed402615 ms$0.005
2 days agoPassed402658 ms$0.005
3 days agoPassed402301 ms$0.005