ToolVet
77trust / 100

Mev Guard

by MEV / Sandwich Guard in Onchain & crypto

x402 APIPassing, checked 7 min ago

Agents are the easiest MEV prey: predictable, public-mempool, a measured ~$50M/quarter tax. A sandwich only pays when a trade moves the pool enough to front-run (size vs pool depth). This returns an exposure read (low/elevated/high) and a protected-execution plan: a tight min-out, private/off-mempool inclusion (a Cobalt validity tx via validity-build), and splitting a large order into unattackable chunks. Pass tokenOut + amountUsd. Not financial advice.

GET
https://402.com.tr/api/x402/mev-guard
Price
$0.04
per call in USDC
Uptime
100%
last 30 days
Response time
471 ms
547 ms slowest 5%
Last check
Passed
7 min ago, next in 24 min

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed

How to call it

GET https://402.com.tr/api/x402/mev-guard

Each call costs $0.04 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://402.com.tr/api/x402/mev-guard?amountUsd=5000&tokenOut=0x4ed4E862860beD51a9570b96d89aF5E1B0Efefed

Parameters

ParameterTypeRequiredDescription
amountUsdstringNoTrade size in USD
tokenOutstringYesToken you want to buy

Example response

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

{
  "checkedAt": "2026-10-11T17:14:15.305Z",
  "estPriceImpactPct": 1.21,
  "exposure": "elevated",
  "impactSource": "estimate",
  "liquidityUsd": 816945,
  "sizeToLiquidityPct": 0.612,
  "tokenOut": "0x4ed4E862860beD51a9570b96d89aF5E1B0Efefed",
  "tradeSizeUsd": 5000
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.04.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://402.com.tr/api/x402/mev-guard?amountUsd=5000&tokenOut=0x4ed4E862860beD51a9570b96d89aF5E1B0Efefed'

# 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://402.com.tr/api/x402/mev-guard?amountUsd=5000&tokenOut=0x4ed4E862860beD51a9570b96d89aF5E1B0Efefed' \
  | 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 $0.04 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.04" });
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 $0.04 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2F402.com.tr%2Fapi%2Fx402%2Fmev-guard
const res = await pay("https://402.com.tr/api/x402/mev-guard?amountUsd=5000&tokenOut=0x4ed4E862860beD51a9570b96d89aF5E1B0Efefed");
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 $0.04 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.04"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://402.com.tr/api/x402/mev-guard?amountUsd=5000&tokenOut=0x4ed4E862860beD51a9570b96d89aF5E1B0Efefed")
    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
7 min agoPassed402421 ms$0.04
4 h agoPassed402589 ms$0.04
9 h agoPassed402601 ms$0.04
13 h agoPassed402443 ms$0.04
17 h agoPassed402473 ms$0.04
Show 10 older checks
21 h agoPassed402471 ms$0.04
25 h agoPassed402491 ms$0.04
28 h agoPassed402475 ms$0.04
32 h agoPassed402547 ms$0.04
36 h agoPassed402461 ms$0.04
40 h agoPassed402509 ms$0.04
43 h agoPassed402411 ms$0.04
47 h agoPassed402455 ms$0.04
2 days agoPassed402367 ms$0.04
2 days agoPassed402451 ms$0.04

History

11 Oct 2026Price changed from $0.02 to $0.04