ToolVet
77trust / 100

Token Preflight

by Token Preflight in Onchain & crypto

x402 APIPassing, checked 5 h ago

Token Preflight: pre-trade safety check for a Base ERC-20 (buy/sell simulation, taxes, owner powers, liquidity, LP, holders, verification) with a shareable verdict card. Not investment advice.

GET
https://seenly-token-preflight.vercel.app/api/token-preflight
Price
$0.02
per call in USDC
Uptime
100%
last 30 days
Response time
559 ms
1.0 s slowest 5%
Last check
Passed
5 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://seenly-token-preflight.vercel.app/api/token-preflight

Each call costs $0.02 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://seenly-token-preflight.vercel.app/api/token-preflight?chain=base&mode=card&sizeUsd=100&tokenAddress=0x4ed4E862860beD51a9570b96d89aF5E1B0Efefed

Parameters

ParameterTypeRequiredDescription
chainstringNoOnly Base mainnet (chain id 8453) in v1. One of: base. Default: "base".
modestringNocard = verdict + compact checks; full = adds raw evidence. One of: card, full. Default: "card".
requestKeystringNoOptional idempotency key, echoed back.
sizeUsdnumberNoSimulated trade size in USD. Default: 100.
tokenAddressstringYesERC-20 token contract address on Base.

Example response

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

{
  "as_of_block": "52088888",
  "card_url": "https://seenly-token-preflight.vercel.app/c/<signed>",
  "checks": [
    {
      "id": "trade_simulation",
      "label": "buy and sell simulate successfully",
      "status": "pass"
    }
  ],
  "disclaimer": "Not investment advice. ...",
  "grade": "OK",
  "one_liner": "DEGEN on Base: OK 80/100. Top-10 holders own 61.8%; liquidity $614.0k.",
  "score": 80,
  "verdict": "OK (80/100) for DEGEN. Risk signals: top-10 holders own 61.8%; privileged functions: pause function. Simulated buy/sell OK (tax 0%/0%)."
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.02.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://seenly-token-preflight.vercel.app/api/token-preflight?chain=base&mode=card&sizeUsd=100&tokenAddress=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://seenly-token-preflight.vercel.app/api/token-preflight?chain=base&mode=card&sizeUsd=100&tokenAddress=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 $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
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 $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fseenly-token-preflight.vercel.app%2Fapi%2Ftoken-preflight
const res = await pay("https://seenly-token-preflight.vercel.app/api/token-preflight?chain=base&mode=card&sizeUsd=100&tokenAddress=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 $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://seenly-token-preflight.vercel.app/api/token-preflight?chain=base&mode=card&sizeUsd=100&tokenAddress=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
5 h agoPassed402559 ms$0.02
10 h agoPassed402432 ms$0.02
15 h agoPassed402633 ms$0.02
19 h agoPassed402420 ms$0.02
24 h agoPassed4021.1 s$0.02
Show 10 older checks
29 h agoPassed402700 ms$0.02
33 h agoPassed402601 ms$0.02
38 h agoPassed402645 ms$0.02
42 h agoPassed402839 ms$0.02
46 h agoPassed402888 ms$0.02
2 days agoPassed402637 ms$0.02
2 days agoPassed402567 ms$0.02
2 days agoPassed402487 ms$0.02
3 days agoPassed4021.0 s$0.02
3 days agoPassed402449 ms$0.02