Csp Explain

{
  "asOf": "2026-10-11T14:26:44.554Z",
  "degraded": false,
  "directiveCount": 3,
  "directives": [
    {
      "directive": "default-src",
      "meaning": "Fallback for every fetch directive that is not set.",
      "policy": 1,
      "sources": "'self'"
    },
    {
      "directive": "script-src",
      "meaning": "Where scripts may load from and whether inline scripts and eval run.",
      "policy": 1,
      "sources": "'self' 'unsafe-inline' https://cdn.jsdelivr.net"
    }
  ],
  "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
  "flags": [
    {
      "directive": "script-src",
      "fix": "Use nonces or hashes instead of 'unsafe-inline'.",
      "message": "'unsafe-inline' in script-src allows inline scripts and javascript: URLs, so injected markup can run script.",
      "severity": "HIGH"
    },
    {
      "directive": "script-src",
      "fix": "Prefer nonces or hashes with 'strict-dynamic'.",
      "message": "cdn.jsdelivr.net in script-src serves content an attacker can influence (user uploads, JSONP or open package mirrors), which bypasses the allow-list.",
      "severity": "MEDIUM"
    }
  ],
  "highCount": 1,
  "infoCount": 0,
  "lowCount": 4,
  "mediumCount": 2,
  "notChecked": [
    "whether the policy is delivered as enforced or report-only, or in a meta tag (frame-ancestors, report-uri and sandbox are ignored in meta tags)",
    "your application's real behaviour: nonces must be unpredictable and unique per response, which cannot be seen in a header value",
    "…3 more"
  ],
  "policyCount": 1,
  "reasons": [
    "HIGH: 'unsafe-inline' in script-src allows inline scripts and javascript: URLs, so injected markup can run script.",
    "MEDIUM: cdn.jsdelivr.net in script-src serves content an attacker can influence (user uploads, JSONP or open package mirrors), which bypasses the allow-list.",
    "…5 more"
  ],
  "source": "W3C Content Security Policy Level 3 rules, computed locally",
  "summary": "3 directives parsed: 1 high, 2 medium, 4 low risk flags.",
  "verdict": "CSP_HIGH_RISK"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://dev-reference.x402tookit.com/csp-explain?value=default-src+%27self%27%3B+script-src+%27self%27+%27unsafe-inline%27+https%3A%2F%2Fcdn.jsdelivr.net%3B+img-src+*'

# 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://dev-reference.x402tookit.com/csp-explain?value=default-src+%27self%27%3B+script-src+%27self%27+%27unsafe-inline%27+https%3A%2F%2Fcdn.jsdelivr.net%3B+img-src+*' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// 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%2Fdev-reference.x402tookit.com%2Fcsp-explain
const res = await pay("https://dev-reference.x402tookit.com/csp-explain?value=default-src+%27self%27%3B+script-src+%27self%27+%27unsafe-inline%27+https%3A%2F%2Fcdn.jsdelivr.net%3B+img-src+*");
console.log(res.status, await res.text());

# 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://dev-reference.x402tookit.com/csp-explain?value=default-src+%27self%27%3B+script-src+%27self%27+%27unsafe-inline%27+https%3A%2F%2Fcdn.jsdelivr.net%3B+img-src+*")
    print(res.status_code, res.text)