Network intelligence and browser signals for signup, login, and checkout.
Website · API reference · Get a free API key · Guides
Maskbreak helps developers assess suspicious visits before a sensitive action.
Send a browser SDK token to your backend, evaluate it server-side, and use the
returned allow, review, or block decision in your own policy.
- Network context: VPNs, proxies, Tor, and cloud-server signals. Service names are returned when known.
- Browser context: device fingerprints, signs of browser tampering, and automation signals.
- A reason behind the decision: inspect the score and signals, not just a yes/no answer.
A VPN alone calls for review, not a block. Signals are not proof of fraud. Bare-IP lookups cover Tor and cloud-server ranges; VPN/proxy attribution and device checks require an SDK-backed live visit.
Free plan: 10,000 visitor checks a month, no credit card; paid plans from €29 a month. See the current limits.
| Tool | Repository | Package |
|---|---|---|
| Node.js SDK | maskbreak-node | @sentinelsup/sdk |
| Python SDK | maskbreak-python | sentinelsup |
| PHP SDK | maskbreak-php | sentinelsup/sdk |
| MCP server | maskbreak-mcp | @sentinelsup/mcp |
The three server SDKs have no third-party runtime dependencies. All four
projects are MIT licensed. Existing sentinelsup package names are preserved
so integrations keep working.
- Create an API key.
- Add the browser SDK to collect a visitor token.
- Send the token to your backend and evaluate it there—keep the API key off the client.
- Apply your own allow, review, or block policy before the protected action.
Follow the integration guide → Node.js, Python, and PHP examples live in their repositories. For an AI-assisted setup, use the integration reference.
Account takeover protection · Signup abuse · Public-interest program
Contact support · Service status · Report a vulnerability privately
Built by Kaspar Tomson · Sentinel Edge Networks LTD · England & Wales 17150600
