ToolVet
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Gas Fees

by agent-margin-router-production.up.railway.app in Onchain & crypto

x402 APIPassing, checked 2 h ago

Agent Margin Router – Gas Fees: Live EIP-1559 gas fees (slow/standard/fast tiers) plus USD cost per transaction type (transfer, ERC-20 transfer, swap, NFT mint) for Base, Ethereum, Arbitrum, Optimism and Polygon. Aggregated from public RPC nodes – no API key. Pay per call with USDC or USDT on Base via x402. 3 free calls per wallet.

POST
https://agent-margin-router-production.up.railway.app/gas-fees
Price
$0.005
per call in USDC
Uptime
100%
last 30 days
Response time
295 ms
437 ms 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

POST https://agent-margin-router-production.up.railway.app/gas-fees

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://agent-margin-router-production.up.railway.app/gas-fees
content-type: application/json

{
  "chain": "base"
}

Parameters

ParameterTypeRequiredDescription
chainstringNobase | ethereum | arbitrum | optimism | polygon (default base).
max_age_secondsintegerNoMax cache age (default 10).

Example response

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

Example response, 27 lines
{
  "base_fee_gwei": 0.0051,
  "block_number": 21000000,
  "chain": "base",
  "chain_id": 8453,
  "cost_usdc": 0.005,
  "freshness_seconds": 0,
  "gas_price_gwei": 0.0062,
  "native_price_usd": 3412.5,
  "native_token": "ETH",
  "routing": {
    "cache_hit": false,
    "latency_ms": 310,
    "provider": "onchain"
  },
  "tiers": {
    "standard": {
      "cost_usd": {
        "swap": 0.0036,
        "transfer": 0.0005
      },
      "max_fee_gwei": 0.0071,
      "priority_fee_gwei": 0.001
    }
  },
  "trend": "stable"
}

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://agent-margin-router-production.up.railway.app/gas-fees' \
  -H 'content-type: application/json' \
  --data-raw '{"chain":"base"}'

# 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://agent-margin-router-production.up.railway.app/gas-fees' \
  -H 'content-type: application/json' \
  --data-raw '{"chain":"base"}' \
  | 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%2Fagent-margin-router-production.up.railway.app%2Fgas-fees&method=POST
const res = await pay("https://agent-margin-router-production.up.railway.app/gas-fees", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "chain": "base"
  }),
});
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://agent-margin-router-production.up.railway.app/gas-fees",
        json={
            "chain": "base",
        },
    )
    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 agoPassed402290 ms$0.005
6 h agoPassed402345 ms$0.005
10 h agoPassed402287 ms$0.005
13 h agoPassed402289 ms$0.005
16 h agoPassed402284 ms$0.005
Show 10 older checks
19 h agoPassed402472 ms$0.005
22 h agoPassed402284 ms$0.005
25 h agoPassed402437 ms$0.005
29 h agoPassed402406 ms$0.005
33 h agoPassed402340 ms$0.005
39 h agoPassed402375 ms$0.005
44 h agoPassed402313 ms$0.005
2 days agoPassed402283 ms$0.005
2 days agoPassed402278 ms$0.005
3 days agoPassed402333 ms$0.005