ToolVet
80trust / 100

Evm Token Safety

by ERC20 pre-trade safety check in Onchain & crypto

x402 APIPassing, checked 3 h ago

Pre-trade risk check for any ERC20 on Base, Ethereum, Polygon, Arbitrum or Optimism, straight from the deployed bytecode and live state. Detects mint, pause, blacklist, upgradeable proxy and mutable buy/sell tax powers, and reports whether ownership is renounced. Unlike LLM-written verdicts this returns the EVIDENCE - the exact selector found and its byte offset - so an agent can apply its own policy. Deterministic: same contract, same answer.

GET
https://flat-rate-llm.kikoribera03.workers.dev/v1/evm/token-safety
Price
$0.01
per call in USDC
Uptime
100%
last 30 days
Response time
255 ms
559 ms slowest 5%
Last check
Passed
3 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

How to call it

GET https://flat-rate-llm.kikoribera03.workers.dev/v1/evm/token-safety

Each call costs $0.01 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://flat-rate-llm.kikoribera03.workers.dev/v1/evm/token-safety?chain=base&token=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Parameters

ParameterTypeRequiredDescription
chainstringNobase | ethereum | polygon | arbitrum | optimism.
tokenstringYesERC20 contract address to check.

Example response

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

{
  "chain": "eip155:8453",
  "findings": [
    {
      "means": "the whole implementation can be swapped: today's code is not a promise",
      "offsetBytes": 412,
      "power": "upgradeTo(address)",
      "selector": "0x3659cfe6",
      "weight": 3
    }
  ],
  "isContract": true,
  "isERC20": true,
  "limitations": [
    "Reads bytecode and state only: holder concentration and liquidity need an indexer and are NOT checked.",
    "A four-byte selector can appear by chance; offsetBytes is given so you can verify it."
  ],
  "name": "USD Coin",
  "ownershipRenounced": false,
  "risk": "medium",
  "score": 6,
  "symbol": "USDC",
  "token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.01.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://flat-rate-llm.kikoribera03.workers.dev/v1/evm/token-safety?chain=base&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://flat-rate-llm.kikoribera03.workers.dev/v1/evm/token-safety?chain=base&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 $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
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 $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fflat-rate-llm.kikoribera03.workers.dev%2Fv1%2Fevm%2Ftoken-safety
const res = await pay("https://flat-rate-llm.kikoribera03.workers.dev/v1/evm/token-safety?chain=base&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 $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://flat-rate-llm.kikoribera03.workers.dev/v1/evm/token-safety?chain=base&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
3 h agoPassed402559 ms$0.01
7 h agoPassed402219 ms$0.01
11 h agoPassed402176 ms$0.01
15 h agoPassed40245 ms$0.01
19 h agoPassed402255 ms$0.01
Show 10 older checks
23 h agoPassed402266 ms$0.01
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