One API call shows you the device behind every request. Maskbreak catches antidetect browsers, residential proxies, bots and AI agents in under 40 ms — with zero friction for real customers.
Live on this visit — no key, no signup.
Why teams choose Maskbreak
Most fraud tools stop at IP and proxy data — the browser itself goes unexamined. Maskbreak fingerprints the device first, then layers network intelligence on top. Two angles, one verdict.
Kameleo, GoLogin, Multilogin, Dolphin {anty}, AdsPower — every major antidetect build leaves device-level fingerprints Maskbreak reads in real time. Most fraud APIs never see them.
Residential proxies, VPNs, datacenter ASNs, and Tor exits — scored at the edge against live data, not stale lists. The network signal stacks on the device verdict, so attackers can't slip through one layer at a time.
400+ device, network, and behavioural signals collapse into one decision — allow, review, or block. Real-time, no CAPTCHAs, no friction for the customers you want.
Simple integration
Three steps. No infrastructure changes. No friction for real users.
// 1. browser — collect a session token, no cookies
<script src="https://sntlhq.com/sentinel.js"></script>
// 2. server — forward it with your API key
const r = await fetch('https://sntlhq.com/v1/evaluate', {
method: 'POST',
headers: {
'Authorization': `Bearer ${process.env.SENTINEL_KEY}`,
'Content-Type': 'application/json'
},
body: JSON.stringify({ monocle: req.body.monocle })
});
// 3. act on the verdict
const v = await r.json();
if (v.isSuspicious) return res.status(403).end();# pip install sentinelsup
from sentinelsup import Maskbreak
client = Maskbreak(api_key=os.environ["SENTINEL_KEY"])
result = client.evaluate(monocle=request.json["monocle"])
if result.is_suspicious:
return jsonify(error="blocked"), 403
# result.decision -> "allow" | "review" | "block"
# result.network.vpn, result.device.tampering, ...// composer require sentinelsup/sdk
use Maskbreak\Client;
$client = new Client(getenv('SENTINEL_KEY'));
$result = $client->evaluate([
'monocle' => $_POST['monocle'] ?? null,
]);
if ($result->isSuspicious()) {
http_response_code(403);
exit;
}# the free endpoint needs no key at all
curl -s https://sntlhq.com/api/lookup \
-H 'Content-Type: application/json' \
-d '{"ip":"185.220.101.33"}'
# full pipeline, with a key
curl -s https://sntlhq.com/v1/evaluate \
-H "Authorization: Bearer $SENTINEL_KEY" \
-H 'Content-Type: application/json' \
-d '{"monocle":"<token from the browser>"}'Hosted MCP server — AI agents can screen IPs out of the box. MCP docs →
Feature presence sourced from each vendor's public product documentation. June 2026.
Maskbreak
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|---|---|---|---|---|---|
| Antidetect browser detection | ✓ | — | — | — | — |
| AI agent detection | ✓ | — | — | ~ | — |
| Residential proxy detection | ✓ | ~ | — | — | ~ |
| Real device fingerprinting | ✓ | ~ | ✓ | ✓ | — |
| Tor exit node detection | ✓ | ✓ | ✓ | — | ✓ |
| CAPTCHA-free bot detection | ✓ | — | — | — | — |
| Client-side SDK token | ✓ | — | ~ | ✓ | — |
| Sub-40ms server-side global latency | 23ms | 180ms | 220ms | 150ms | 90ms |
| Free production tier | 1,000 / hr | 5k/mo | Trial | — | Trial |
| Transparent public pricing | ✓ | ~ | — | — | ✓ |
| Self-serve, 5-min integration | ✓ | ✓ | ~ | — | ✓ |
Sourced from public product pages, June 2026. Latency measured against vendor public test endpoints. Read the full benchmark → All 8 vendor comparisons →
See how fraud detection stops chargebacks, fake accounts, and trial abuse.
A fraud ring was inflating pledge counts through residential proxies — every "backer" looked clean. Maskbreak found the ASN signature the ring couldn't randomize and collapsed it within 30 days.
Read Case Study →Competitors were spinning up proxy-masked accounts to scrape pricing data and burn through trial credits. One API integration stopped it cold in a single afternoon.
Read Case Study →A coordinated friendly-fraud ring was filing chargeback disputes at scale using residential proxies. Maskbreak's behavioral layer flagged the pattern before a single dispute was processed.
Read Case Study →“Maskbreak caught residential-proxy signups our last vendor was returning clean on. The drop in chargebacks paid for the integration in week three.”
“Switched from IPQS in a weekend. Our antidetect-browser catch rate jumped overnight.”
“We benchmarked Maskbreak against three paid vendors and shipped on the free plan — 1,000 verdicts an hour, in production, no card.”
Paraphrased feedback from open-beta users; names withheld for privacy. Attributed reviews live on Trustpilot and G2.
Free while in open beta
1,000 requests an hour, free. No credit card, no expiry, no sales call. Deterministic test tokens so you can exercise fraud paths in CI on day one.
