Block what shouldn't reach your applications.
Malicious requests stop. Clean traffic passes.
Inspection at the edge, before the damage.
Managed + custom
Use continuously updated managed protections for common attacks, then layer on rules tailored to your own API paths, authentication flows, and business logic.
Protected against the attacks that matter, from day one.
OWASP Top 10
The industry-standard list of critical web application security risks, refreshed continuously.
SQL injection
Classic and blind injection patterns, including parameterised-query bypass attempts.
Cross-site scripting (XSS)
Reflected and stored variants blocked before they reach the application.
Local & remote file inclusion
Attempts to access or execute files outside your application's intended scope.
Sensitive file attacks
Probes for .env files, backups, version-control directories, and config leaks.
Path traversal
Attempts to escape your application's directory structure.
Protect what's specific to your application.
Managed rules cover the common ground. Custom rules let you protect what’s unique to you — your API endpoints, your authentication flow, your business logic.
Build rules visually using a clear condition-and-action structure. Match on request method, path, headers, body content, source IP, geography, or any combination. Trigger actions like block, challenge, log-only, rate-limit, or label-and-forward for downstream analysis.
Rule builder flexibility
Compose conditions across request attributes and choose different actions depending on the risk, endpoint, or geography involved.
Shadow-mode testing
Test new rules without enforcement. CrownWall tags matching traffic so you can review exactly what a rule would have done, then turn enforcement on with confidence. No more blocking real customers by accident.
Designed for API workloads, not retrofitted for them.
Most firewalls were built for traditional websites and had API support bolted on later. CrownWall treats API protection as a first-class concern: per-endpoint rule scoping, JSON body inspection, query-parameter validation, and rate limiting that understands the difference between a public marketing page and an authenticated API call.
API-aware inspection
Rules can be scoped by endpoint and request shape, helping protect authenticated APIs and machine-to-machine flows with far more precision than page-oriented firewalls.