ToolVet
77trust / 100

Package Preflight

by Forest Gas Station in Developer tools

x402 APIPassing, checked 57 min ago

Normalize npm or PyPI package reality: existence, requested-version existence, resolved/latest version, staleness, deprecation/yank state when available, license and runtime requirement. No dependency graph or vulnerability analysis. Public registries only; unsupported provider fields are null.

POST
https://http--forest-gas-station--lcjl27p8lmjs.code.run/package/preflight
Price
$0.002
per call in USDC
Uptime
96.4%
last 30 days
Response time
178 ms
333 ms slowest 5%
Last check
Passed
57 min ago, next any minute now

Run a free test callHow to call it

Reliability

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Status and outage history · Atom feed · Watch with other listings

How to call it

POST https://http--forest-gas-station--lcjl27p8lmjs.code.run/package/preflight

Each call costs $0.002 in USDC on Base Sepolia, 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://http--forest-gas-station--lcjl27p8lmjs.code.run/package/preflight
content-type: application/json

{
  "ecosystem": "npm",
  "package": "express",
  "version": "5.1.0"
}

Parameters

ParameterTypeRequiredDescription
ecosystemanyYes One of: npm, pypi.
packagestringYes
versionstringNo

Example response

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

Example response, 27 lines
{
  "capability": "package.preflight",
  "data": {
    "deprecated": false,
    "ecosystem": "npm",
    "exists": true,
    "latest_version": "5.1.0",
    "license": "MIT",
    "outdated": false,
    "package": "express",
    "project_url": "https://expressjs.com/",
    "registry_url": "https://registry.npmjs.org/express",
    "requested_version": "5.1.0",
    "requested_version_exists": true,
    "requires_runtime": ">= 18",
    "resolved_version": "5.1.0",
    "yanked": null
  },
  "meta": {
    "cache": "miss",
    "checked_at": "2026-09-26T00:00:00.000Z",
    "duration_ms": 25,
    "provider": "npm"
  },
  "ok": true,
  "version": "1"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.002.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://http--forest-gas-station--lcjl27p8lmjs.code.run/package/preflight' \
  -H 'content-type: application/json' \
  --data-raw '{"ecosystem":"npm","package":"express","version":"5.1.0"}'

# 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://http--forest-gas-station--lcjl27p8lmjs.code.run/package/preflight' \
  -H 'content-type: application/json' \
  --data-raw '{"ecosystem":"npm","package":"express","version":"5.1.0"}' \
  | 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 $0.002 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.002" });
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 $0.002 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fhttp--forest-gas-station--lcjl27p8lmjs.code.run%2Fpackage%2Fpreflight&method=POST
const res = await pay("https://http--forest-gas-station--lcjl27p8lmjs.code.run/package/preflight", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "ecosystem": "npm",
    "package": "express",
    "version": "5.1.0"
  }),
});
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 $0.002 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.002"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://http--forest-gas-station--lcjl27p8lmjs.code.run/package/preflight",
        json={
            "ecosystem": "npm",
            "package": "express",
            "version": "5.1.0",
        },
    )
    print(res.status_code, res.text)

Security scan

No findings

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Recent checks

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57 min agoPassed402159 ms$0.002
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14 h agoPassed402359 ms$0.002
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