Alternatives to Prompt Security

Organizations evaluating how to validate API and LLM security posture have multiple approaches to consider. Some solutions emphasize agent-based instrumentation or code access, while others focus on external, black-box testing that does not require changes to the application environment. Alternatives vary in scope from narrow tooling aimed at a single vulnerability class to broader platforms that include scanning, monitoring, and reporting across multiple API surfaces. Understanding the tradeoffs between integration complexity, runtime impact, and detection coverage helps teams select the approach that fits their risk tolerance and delivery model.

MiddleBrick is a self-service API security scanner that accepts a target URL and returns a risk score with prioritized findings. It operates as a black-box scanner, requiring no agents, no code access, and no SDK integration, and supports any language, framework, or cloud. Scans complete in under a minute using read-only methods such as GET and HEAD, with text-only POST allowed for LLM probes. The tool maps findings to three frameworks, including PCI-DSS 4.0, SOC 2 Type II, and OWASP API Top 10 (2023). Detection categories cover authentication bypass, broken object level authorization, property authorization exposure, input validation misconfigurations, rate limiting issues, data exposure patterns, encryption weaknesses, SSRF indicators, inventory mismanagement, unsafe consumption surfaces, and LLM-specific adversarial probes across tiered scan depths.

MiddleBrick parses OpenAPI 3.0, 3.1, and Swagger 2.0 documents, resolving recursive $ref structures to build a complete interface model. It cross-references the spec definitions against runtime behavior to highlight undefined security schemes, sensitive fields exposed by the API, deprecated operations, and missing pagination controls. This approach helps teams identify discrepancies between documented contracts and actual behavior without requiring access to application code or build pipelines. The scanner supports authenticated scans using Bearer tokens, API keys, Basic auth, and cookies, with a domain verification gate that ensures only the domain owner can submit credentials. A limited header allowlist is enforced, forwarding only Authorization, X-API-Key, Cookie, and X-Custom-* headers.

For teams integrating security into delivery pipelines, MiddleBrick provides a CLI that can be executed with a simple command such as middlebrick scan <url>, producing JSON or text output for downstream tooling. A GitHub Action is available to gate CI/CD workflows, failing the build when the score drops below a defined threshold. The MCP Server enables scanning from AI-assisted coding environments, including Claude and Cursor. Organizations that require ongoing visibility can use the Pro tier to schedule rescans at intervals ranging from every six hours to monthly, with diff detection that surfaces new findings, resolved issues, and score drift. Email alerts are rate-limited to one per hour per API, and webhooks are HMAC-SHA256 signed, with auto-disable after five consecutive failures to prevent notification storms.

MiddleBrick operates with a strict read-only posture, never sending destructive payloads. Network-level protections block private IPs, localhost, and cloud metadata endpoints at multiple layers. Customer scan data is deletable on demand and purged within 30 days of cancellation, and scan information is never sold or used for model training. The tool does not provide remediation, patch code, or block requests; it surfaces findings and offers guidance. It does not test for classic injection techniques such as SQL injection or command injection, which fall outside its scope, nor does it detect business logic flaws that require deep domain understanding. Blind SSRF and other out-of-band infrastructure checks are also out of scope.

When comparing middleware-style security tools, teams often evaluate solutions based on deployment model and scope. Several viable alternatives to broader platforms include specialized proxies that inspect traffic in-line, SaaS dashboards that aggregate scan results from multiple tools, and lightweight CLI utilities focused on contract validation. Open-source frameworks that generate interactive API tests can be extended with custom security checks, though they typically require ongoing maintenance. Commercial platforms that bundle scanning with runtime application self-protection provide integrated environments but may introduce agent-based dependencies. MiddleBrick distinguishes itself through its black-box approach, rapid scan times, explicit support for LLM security probes, and flexible deployment options that integrate with dashboards, CI/CD pipelines, and AI coding assistants without requiring code changes.