ToolVet
16trust / 100

Tx Cost

by Vextorium in Onchain & crypto

x402 APIFailing, checked 3 h ago

What a typical operation costs right now in USD on 12 EVM chains (Ethereum, Base, Arbitrum, Optimism, Polygon, BNB, Avalanche, Gnosis, Linea, Scroll, Sonic, Unichain): native transfer, ERC-20 transfer, DEX swap or NFT mint, sorted cheapest first.

POST https://api.vextorium.com/v1/tx-cost

Last 30 days

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Status and outage history · Atom feed

Uptime
0.0%
Response time
- typical, - slowest 5%
Last check
3 h ago: Amount "0.003" is not in atomic token units
Next check
any minute now

How to call it

POST https://api.vextorium.com/v1/tx-cost

Each call costs $0.003 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://api.vextorium.com/v1/tx-cost
content-type: application/json

{
  "trade": "swap_dex"
}

Parameters

ParameterTypeRequiredDescription
tradestringNo One of: native_transfer, erc20_transfer, swap_dex, mint_nft.

Example response

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

{
  "cheapest": "gnosis",
  "estimated_gas": 180000,
  "networks": [
    {
      "cost_usd": 9.08e-10,
      "gas_gwei": 0.00001,
      "native_price_usd": 0.9998872197210351,
      "network": "gnosis"
    },
    {
      "cost_usd": 0.0000579,
      "gas_gwei": 0.00012,
      "native_price_usd": 2677.4388691961326,
      "network": "scroll"
    }
  ],
  "note": "Estimate with typical gas usage; the real cost depends on the contract.",
  "source": "Public RPC nodes (gas price) and DefiLlama (native token price)",
  "trade": "swap_dex"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.003.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.vextorium.com/v1/tx-cost' \
  -H 'content-type: application/json' \
  --data-raw '{"trade":"swap_dex"}'

# 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://api.vextorium.com/v1/tx-cost' \
  -H 'content-type: application/json' \
  --data-raw '{"trade":"swap_dex"}' \
  | 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 $0.003 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.003" });
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 $0.003 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.vextorium.com%2Fv1%2Ftx-cost&method=POST
const res = await pay("https://api.vextorium.com/v1/tx-cost", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "trade": "swap_dex"
  }),
});
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 $0.003 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.003"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://api.vextorium.com/v1/tx-cost",
        json={
            "trade": "swap_dex",
        },
    )
    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 agoAmount "0.003" is not in atomic token units402319 ms$0.003
7 h agoAmount "0.003" is not in atomic token units402137 ms$0.003
11 h agoAmount "0.003" is not in atomic token units40279 ms$0.003
16 h agoAmount "0.003" is not in atomic token units40285 ms$0.003
20 h agoAmount "0.003" is not in atomic token units40298 ms$0.003
25 h agoAmount "0.003" is not in atomic token units40294 ms$0.003
29 h agoAmount "0.003" is not in atomic token units40285 ms$0.003
33 h agoAmount "0.003" is not in atomic token units40283 ms$0.003
37 h agoAmount "0.003" is not in atomic token units40284 ms$0.003
41 h agoAmount "0.003" is not in atomic token units40280 ms$0.003
45 h agoAmount "0.003" is not in atomic token units40287 ms$0.003
2 days agoAmount "0.003" is not in atomic token units40282 ms$0.003
2 days agoAmount "0.003" is not in atomic token units40282 ms$0.003
2 days agoAmount "0.003" is not in atomic token units40277 ms$0.003
3 days agoAmount "0.003" is not in atomic token units40279 ms$0.003