42Crunch vs APIsec: which is better?

Both tools surface API risks without requiring access to source code, but they differ in testing methodology and depth. middleBrick is a black-box scanner that only sends read-only methods plus text-only POST for LLM probes; it does not execute destructive payloads. 42Crunch focuses on runtime protection and policy enforcement, with more emphasis on active blocking and runtime behavior than exhaustive vulnerability enumeration.

middleBrick completes a scan in under a minute and covers 12 categories aligned to OWASP API Top 10, including authentication bypass, IDOR, business logic indicators, data exposure patterns, and LLM security probes across multiple tiers. 42Crunch integrates more tightly with runtime protection and API gateways, offering policy-based enforcement in addition to discovery, which can overlap with WAF or runtime application self-protection features.

If your priority is a quick, repeatable audit that maps clearly to OWASP API Top 10 and provides prioritized findings with remediation guidance, middleBrick fits that use case. If you need runtime blocking, policy-as-code enforcement, and integration with gateway controls, 42Crunch may be more appropriate.

middleBrick supports Bearer, API key, Basic auth, and Cookie authentication for authenticated scanning, gated by domain verification to ensure only domain owners submit credentials. It detects JWT misconfigurations such as alg=none, weak signing algorithms, expired tokens, missing claims, and sensitive data in claims, along with security header and WWW-Authenticate compliance issues.

42Crunch emphasizes policy-driven authorization checks at runtime, often tying authentication to gateway policies and service meshes. For teams already enforcing authorization at the edge, this can feel like a natural extension. middleBrick instead focuses on what an external scanner can observe, validating whether authentication mechanisms can be bypassed or abused without internal policy enforcement.

For audits where you need an external, agentless view of authentication and authorization weaknesses, middleBrick provides concrete evidence. For teams managing runtime policy as code, 42Crunch offers tighter integration with enforcement points.

middleBrick parses OpenAPI 3.0, 3.1, and Swagger 2.0 with recursive $ref resolution, cross-referencing spec definitions against runtime behavior. It flags undefined security schemes, sensitive fields exposed in responses, deprecated operations, and missing pagination, helping you align the spec with actual implementation.

42Crunch often centers on schema validation and runtime policy, ensuring requests and responses adhere to defined contracts and blocking violations. This is valuable for teams practicing strict contract testing and threat modeling enforced at the gateway.

If your objective is to compare documented expectations against live behavior and surface gaps such as over-exposed properties or missing authorization checks on endpoints, middleBrick provides a straightforward path. If you require continuous enforcement and automated blocking of malformed or malicious requests, 42Crunch is designed for that runtime model.

middleBrick includes 18 adversarial probes across three scan tiers, targeting LLM and AI security risks. These include system prompt extraction attempts, instruction override tries, DAN and roleplay jailbreaks, data exfiltration probes, cost exploitation, encoding bypasses, translation-embedded injection, few-shot poisoning, markdown injection, multi-turn manipulation, indirect prompt injection, token smuggling, tool abuse, nested instruction injection, and PII extraction.

42Crunch typically does not emphasize LLM-specific probes, as its focus remains on policy enforcement and runtime protection for traditional API traffic. If your applications expose AI features and you need dedicated adversarial testing of those endpoints, middleBrick offers a structured set of tests tailored to these risks.

middleBrick maps findings directly to PCI-DSS 4.0, SOC 2 Type II, and OWASP API Top 10 (2023), using language that reflects alignment and evidence support rather than certification. It helps you prepare for audits by surfacing findings relevant to these frameworks and providing documentation-friendly reports.

42Crunch aligns more closely with runtime security policies and gateway controls, supporting evidence for operational resilience and enforcement maturity. It does not claim audit certification, but it can feed controlled blocking decisions that assist in meeting internal control objectives.

For teams needing an external audit artifact that maps to recognized standards, middleBrick is positioned as the scanner. For teams embedding security controls into deployment pipelines and runtime fabrics, 42Crunch offers complementary enforcement capabilities.