How does NSLSolver bypass Cloudflare Challenge?

NSLSolver reverse-engineers Cloudflare's Challenge and computes a valid solution in real-time. You send us the target URL and we return the cf_clearance cookie and User-Agent you need to pass through.

How much does Cloudflare Challenge bypass cost?

$0.50 per 1,000 solves. No monthly fees. Failed solves are not charged.

How long does the cf_clearance cookie last?

Cloudflare typically sets cf_clearance cookies to expire after 15-30 minutes, depending on the site's security settings. You can re-solve as needed.

Cloudflare Challenge Bypass

Bypass Cloudflare Challenge Instantly

Solve Cloudflare managed challenges (5-second and interactive) via a single API call. We return cf_clearance cookies and the matching User-Agent — ready to use.

<3sAvg solve time$0.50Per 1,000 solves95%+Success rate

Get Started View Docs

Understanding the Challenge

What is Cloudflare Challenge?

Cloudflare Challenge

Cloudflare Challenge (also called managed challenge or 5-second challenge) is a full-page browser verification that requires JavaScript execution. Unlike Turnstile, which is an embedded widget, Challenge takes over the entire page and forces the visitor to wait while Cloudflare validates the browser environment.

Turnstile vs Challenge

Turnstile

Invisible or visible widget embedded in a form. Returns a token you submit with the form data.

Managed Challenge

Full-page interstitial. Returns a cf_clearance cookie and requires a matching User-Agent for subsequent requests.

Integration

Three steps. Done.

Send us the target URL, we reverse the challenge, you get the cookie.

Send the URL

POST the target URL to our /solve endpoint with type set to "challenge".

We solve it

We reverse-engineer Cloudflare's Challenge and generate a valid cf_clearance cookie directly — no browser navigation.

Use the cookie

Set the cf_clearance cookie and User-Agent on your HTTP client. All subsequent requests pass through Cloudflare.

Unlike Turnstile (which returns a token), Challenge bypass returns a cf_clearance cookie and a User-Agent string. You must use both together for the cookie to be accepted by Cloudflare.

Code Examples

Copy, paste, bypass.

challenge-solve.sh

$curl -X POST \

"https://api.nslsolver.com/solve" \

-H "X-API-Key: nsl_your_api_key" \

-H "Content-Type: application/json" \

-d '{

"type": "challenge",

"url": "https://target-site.com",

"proxy": "http://user:pass@proxy:8080"

Response 200 OK

{

"success": true,

"cookies": {

"cf_clearance": "LnMR5BKt0.dCjH..."

"user_agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64)...",

"type": "challenge"

}

solve_challenge.py

import requests

resp = requests.post(

"https://api.nslsolver.com/solve",

headers={"X-API-Key": "nsl_your_api_key"},

json={

"type": "challenge",

"url": "https://target-site.com",

"proxy": "http://user:pass@proxy:8080"

}

)

data = resp.json()

# Use the cookie + user-agent to access the target

session = requests.Session()

session.cookies.set("cf_clearance", data["cookies"]["cf_clearance"])

session.headers["User-Agent"] = data["user_agent"]

page = session.get("https://target-site.com/data")

solveChallenge.js

const resp = await fetch("https://api.nslsolver.com/solve", {

method: "POST",

headers: {

"X-API-Key": "nsl_your_api_key",

"Content-Type": "application/json"

body: JSON.stringify({

type: "challenge",

url: "https://target-site.com",

proxy: "http://user:pass@proxy:8080"

})

});

const { cookies, user_agent } = await resp.json();

// Use cookie + user-agent for subsequent requests

const page = await fetch("https://target-site.com/data", {

headers: {

"Cookie": `cf_clearance=${{cookies.cf_clearance}}`,

"User-Agent": user_agent

}

});

Pricing

Cheapest Challenge bypass on the market

Provider	Per 1,000	Avg Speed
NSLSolver	$0.50	<3s
Anti-Captcha	$2.99	~10s
CapSolver	$1.40	~8s
2Captcha	$1.20	~12s

Prices sourced from public pricing pages as of April 2026. Subject to change.

FAQ

Frequently Asked Questions

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Guides & tutorials

Guide