ToolVet
80trust / 100

Evm Gas Estimate

by Gas estimate in Onchain & crypto

x402 APIPassing, checked 2 h ago

Gas estimate before you send, on Ethereum, Base, Arc or BNB Chain: pass ?to=&from=&data=&value= and get the gas units, the gas price and the fee in the native coin, or the revert reason if the transaction would fail. Nothing is signed or sent.

GET
https://apexfaucet.xyz/api/x402/evm-gas-estimate
Price
$0.001
per call in USDC
Uptime
100%
last 30 days
Response time
236 ms
1.1 s slowest 5%
Last check
Passed
2 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

GET https://apexfaucet.xyz/api/x402/evm-gas-estimate

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-gas-estimate?chain=base&data=0x&from=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&to=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&value=1000

Parameters

ParameterTypeRequiredDescription
chainstringNoChain to read: ethereum, base, arc or bnb. Default ethereum. One of: ethereum, base, arc, bnb.
datastringNoOptional hex calldata.
fromstringNoOptional sender.
tostringYesRecipient or contract.
valuestringNoOptional value in wei.

Example response

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

{
  "data": {
    "block": 26184818,
    "blockTime": "2026-10-13T16:38:59.000Z",
    "chain": "ethereum",
    "estimatedFee": "0.000005294719024621",
    "feeSymbol": "ETH",
    "gas": "21227",
    "gasPriceGwei": "0.249433223",
    "ok": true,
    "to": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
  },
  "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-gas-estimate?chain=base&data=0x&from=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&to=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&value=1000'

# 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-gas-estimate?chain=base&data=0x&from=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&to=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&value=1000' \
  | 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-gas-estimate
const res = await pay("https://apexfaucet.xyz/api/x402/evm-gas-estimate?chain=base&data=0x&from=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&to=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&value=1000");
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-gas-estimate?chain=base&data=0x&from=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&to=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&value=1000")
    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
2 h agoPassed402117 ms$0.001
6 h agoPassed4021.1 s$0.001
10 h agoPassed402379 ms$0.001
14 h agoPassed402307 ms$0.001
18 h agoPassed402141 ms$0.001
Show 8 older checks
23 h agoPassed402181 ms$0.001
27 h agoPassed402236 ms$0.001
31 h agoPassed402584 ms$0.001
35 h agoPassed402343 ms$0.001
39 h agoPassed402211 ms$0.001
43 h agoPassed402127 ms$0.001
47 h agoPassed402115 ms$0.001
2 days agoPassed402350 ms$0.001