ToolVet
71trust / 100

Evm Allowance

by ERC20 allowance in Onchain & crypto

x402 APIPassing, checked 36 min ago

ERC20 allowance on Ethereum, Base, Arc or BNB Chain: how much a spender may move from an owner, raw and in token units, and whether the approval is effectively unlimited. Pass ?token=&owner=&spender=&chain=

GET
https://apexfaucet.xyz/api/x402/evm-allowance
Price
$0.001
per call in USDC
Uptime
79.0%
last 30 days
Response time
347 ms
1.7 s slowest 5%
Last check
Passed
36 min 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

GET https://apexfaucet.xyz/api/x402/evm-allowance

Each call costs $0.001 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://apexfaucet.xyz/api/x402/evm-allowance?chain=base&owner=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&spender=0x000000000022D473030F116dDEE9F6B43aC78BA3&token=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Parameters

ParameterTypeRequiredDescription
chainstringNoChain to read: ethereum, base, arc or bnb. Default ethereum. One of: ethereum, base, arc, bnb.
ownerstringYesWallet that gave the approval.
spenderstringYesContract allowed to spend.
tokenstringYesERC20 token contract.

Example response

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

{
  "data": {
    "allowance": "0",
    "block": 26184816,
    "blockTime": "2026-10-13T16:38:35.000Z",
    "chain": "ethereum",
    "ok": true,
    "owner": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
    "raw": "0",
    "spender": "0x000000000022D473030F116dDEE9F6B43aC78BA3",
    "symbol": "USDC",
    "token": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
    "unlimited": false
  },
  "ok": true,
  "paid": 0.001
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.001.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://apexfaucet.xyz/api/x402/evm-allowance?chain=base&owner=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&spender=0x000000000022D473030F116dDEE9F6B43aC78BA3&token=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 - 'https://apexfaucet.xyz/api/x402/evm-allowance?chain=base&owner=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&spender=0x000000000022D473030F116dDEE9F6B43aC78BA3&token=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 $0.001 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.001" });
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 $0.001 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapexfaucet.xyz%2Fapi%2Fx402%2Fevm-allowance
const res = await pay("https://apexfaucet.xyz/api/x402/evm-allowance?chain=base&owner=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&spender=0x000000000022D473030F116dDEE9F6B43aC78BA3&token=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 $0.001 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.001"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://apexfaucet.xyz/api/x402/evm-allowance?chain=base&owner=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&spender=0x000000000022D473030F116dDEE9F6B43aC78BA3&token=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
36 min agoPassed402258 ms$0.001
5 h agoPassed402286 ms$0.001
10 h agoPassed402833 ms$0.001
15 h agoPassed402318 ms$0.001
20 h agoPassed402380 ms$0.001
Show 10 older checks
24 h agoPassed402191 ms$0.001
29 h agoPassed402668 ms$0.001
33 h agoPassed402347 ms$0.001
37 h agoPassed402400 ms$0.001
41 h agoPassed402447 ms$0.001
46 h agoPassed402285 ms$0.001
2 days agoPassed402366 ms$0.001
2 days agoPassed402288 ms$0.001
2 days agoPassed4021.7 s$0.001
3 days agoPassed402268 ms$0.001