apisec compared to 42Crunch

apisec vs 42Crunch: the short answer

42Crunch is an API security platform built around the API contract. It audits OpenAPI and GraphQL definitions, scans running APIs for conformance to that contract, and enforces the contract on live traffic with its API Firewall.

apisec is an Application Exploit Validation platform. It discovers every application from SAST, SCA, API gateways, API platforms and cloud infrastructure, builds a graph of how each one operates, and generates exploits that attempt to compromise the live application. It delivers a SAST report, an SCA report and, most important, actionable exploits that go to the top of the fix queue. It tests with or without an API contract or source code.

The core difference: 42Crunch checks whether your API behaves the way its contract says it should. apisec checks whether an attacker can get what they want from it, including by breaking authorization rules the contract never describes, and proves each result with replayable evidence. A contract describes intent. Breaches happen in the implementation.

apisec vs 42Crunch at a glance

• Category. 42Crunch: API security platform (contract-based testing and protection). apisec: Application Exploit Validation.
• Main products. 42Crunch: API Security Audit, API Scan (conformance), API Protection and API Firewall, API Contract Generator, MCP security governance, and IDE and coding-agent plugins. apisec: apisec Surface, apisec App Model and apisec Exploit Testing.
• What it needs to start. 42Crunch: an OpenAPI or GraphQL definition for each API. apisec: an inventory from SAST, SCA, API gateways, API platforms and cloud infrastructure; it works with or without a contract or source code.
• Scope. 42Crunch: APIs. apisec: the whole application, including business logic, data access, roles and permissions, the container, infrastructure and security controls.
• What it tests. 42Crunch: whether the running API conforms to its contract, plus injection, authentication and authorization tests. apisec: whether an attacker can compromise the application, across six layers.
• Authorization testing. 42Crunch: BOLA and BFLA scenarios you define in the scan configuration. apisec: generated from the App Model's graph across the full roles-and-permissions matrix.
• Output. 42Crunch: an audit score and scan issues against the contract. apisec: a SAST report, an SCA report, and actionable exploits (confirmed, cleared or blocked, with replayable evidence) at the top of the fix queue.
• Runtime protection. 42Crunch: API Firewall enforces the contract on live traffic. apisec: not a firewall; it proves what's exploitable so you fix it.
• Best for. 42Crunch: design-first API teams who want every API held to a well-defined contract. apisec: knowing what an attacker can actually use across every application, and proving it's closed.

What 42Crunch does well

42Crunch is one of the best-known names in API security, and it runs the APIsecurity.io community newsletter. Its platform, per 42crunch.com and its product documentation, covers:

• API Security Audit, a static analysis of OpenAPI and GraphQL definitions that scores how well each contract is defined and secured
• API Scan, which dynamically tests a running API for conformance to its contract, with injection, authentication and authorization tests in Scan v2
• API Protection and API Firewall, which enforce the contract on live traffic and block requests that don't match it
• API Contract Generator, which creates OpenAPI definitions from code in the IDE
• MCP security governance, added in its September 2026 release
• Plugins for coding agents such as Claude Code and GitHub Copilot, so APIs are audited as they're written

42Crunch's strengths are design-first API governance, developer workflow integration, and a runtime firewall that holds every API to a well-defined contract.

The question 42Crunch leaves open: does the implementation hold up to an attacker?

42Crunch's own research points straight at the answer. Its State of API Security 2026 report, a review of more than 200 real-world API vulnerabilities from 2024 and 2025, found:

• Broken input validation was the largest category, at 28%
• Missing authentication accounted for 17%, driven by APIs that don't enforce authentication server-side
• BOLA and BFLA remain a leading cause of breaches
• Nearly 20% of cases involved APIs that trusted the client application to enforce security
• Few confirmed breaches came from shadow or undocumented APIs. The damage came from weaknesses in known, documented APIs.

We agree with that last point, and it's the heart of this comparison. The APIs being breached are the ones teams already know about and have documented. Their contracts often look fine. The flaw is in how the server actually enforces who can see and do what.

That's where contract-based testing runs out of road. Three gaps remain:

1. A contract describes intent, not enforcement. An API can match its OpenAPI definition exactly and still let one customer read another customer's records. Conformance shows the API behaves as documented. It doesn't show an attacker can't abuse it.
2. Authorization testing depends on what you script. 42Crunch can test BOLA and BFLA, but through scenarios you define in the scan configuration: which users, which objects, which functions. Coverage is only as complete as the scenarios someone writes and maintains.
3. The API is one layer of the application. Real compromises chain across business logic, data access, roles, the container, infrastructure and security controls. A contract only describes the front door.

How apisec works

apisec is Application Exploit Validation: see every way in, prove what an attacker can use, confirm the fix. It has three parts.

apisec Surface: discover every application. Surface builds the application inventory from the systems that already know about your applications: SAST, SCA, API gateways, API platforms and cloud infrastructure. The result is a global view of every enterprise application, what each one is made of, its libraries with known vulnerabilities and whether the vulnerable code is reachable.

apisec App Model: a graph of how each application operates. The App Model is a graph representation of how the application actually works: its routes, identities, authentication, authorization, data flows, dependencies, agents and MCP servers, and how they connect. It captures who is allowed to do what, which is exactly what an API contract leaves out.

apisec Exploit Testing: compromise the application before an attacker does. Exploit Testing uses the graph to generate an inventory of application security exploits, then runs them against the live application to try to compromise it across six layers: business logic, data access, roles and permissions, the application container, infrastructure and security controls. Each exploit is recorded as confirmed, cleared, or blocked on a missing prerequisite, with replayable evidence. After a fix ships, the same exploit reruns and flips from confirmed to cleared.

What apisec delivers

• A SAST report on first-party code
• An SCA report on open source and third-party dependencies
• Most important: actionable exploits. Each one is proven against the running application, comes with evidence and the data it exposed, and goes to the top of the fix queue ahead of everything else.

Models help generate exploits and explanations. A deterministic harness decides what's real, so the same application gives the same answer every run.

apisec tests with or without an API contract or source code

42Crunch's testing starts from an OpenAPI or GraphQL definition. That works well for teams that design APIs contract-first and keep those contracts current. Many applications don't fit that picture:

• APIs with stale, partial or missing contracts. Testing against an outdated contract tests the wrong thing.
• Code you never receive. Cloud frameworks, managed services, vendor SDKs and third-party components run inside your application with no contract or source in your hands.
• Behavior no contract describes. Roles, tenants, object ownership and multi-step business flows live in the implementation, not the specification.

apisec doesn't need the contract or the source. Surface builds the picture from gateways, API platforms, cloud infrastructure, SAST and SCA, and Exploit Testing works against the running application, so it tests the whole stack the way an attacker meets it. When a contract or source code is available, apisec uses it to enrich the App Model and to produce the SAST and SCA reports. When it isn't, testing still runs.

apisec vs 42Crunch, capability by capability

Application discovery

42Crunch: Works from the API definitions you import or generate, organized into API collections.

apisec: Surface builds the application inventory from SAST, SCA, API gateways, API platforms and cloud infrastructure, and maps what each application is made of, including the AI and MCP systems inside it.

API design and contract quality

42Crunch: API Security Audit scores each OpenAPI or GraphQL definition and flags weak or missing security definitions. This is its core strength.

apisec: Uses contracts when they exist to enrich the App Model, but doesn't grade them. apisec's focus is what the running application actually allows.

Runtime testing

42Crunch: API Scan sends happy path and unhappy path requests to the running API and checks responses against the contract, plus injection, authentication and authorization tests.

apisec: Exploit Testing generates attacks from the App Model's graph of that specific application and runs them against the live application across six layers, not only the API surface.

Business logic and authorization

42Crunch: Tests BOLA and BFLA through scenarios you configure, defining the users, objects and functions involved.

apisec: Generates authorization tests from the graph across the full roles-and-permissions matrix, including object-level access and tenant isolation, using real identities.

Code and dependency risk

42Crunch: Not in scope. 42Crunch focuses on APIs rather than SAST or SCA.

apisec: Delivers a SAST report and an SCA report, then tests whether each code-level or dependency risk can be exploited through the application.

Third-party and cloud framework code

42Crunch: Tests APIs that have a contract you can supply. Code that runs in cloud frameworks and managed services sits outside that view.

apisec: Tests the running application with or without a contract or source code, so third-party and cloud framework code is tested the way an attacker meets it.

Runtime protection

42Crunch: API Firewall enforces the contract on live traffic and blocks requests that don't conform.

apisec: Doesn't block traffic. It proves which weaknesses are exploitable so they get fixed at the source, and confirms each fix.

Fix verification

42Crunch: Rerun the audit and scan to check the API now conforms to its contract.

apisec: The same exploit reruns after the fix. Confirmed flips to cleared, giving a measurable record that the attack no longer works.

AI applications and MCP

42Crunch: MCP security governance for AI exposure management and compliance reporting.

apisec: Surface Code AI maps MCP servers, agents, LLM providers and call sites, and the App Model includes them so they're tested as part of the application.

What this means for your program

If your APIs pass their contract checks but you still can't say what an attacker could reach, the answer is proof. Five steps:

1. Pick your most sensitive APIs. Start with the ones that handle customer data, payments or multi-tenant access, the documented APIs where 42Crunch's own research says breaches happen.
2. Map what you actually run. Use apisec Surface to inventory every application and what it's made of, including APIs with stale or missing contracts.
3. Test authorization the way an attacker would. Let apisec Exploit Testing work through the full roles-and-permissions matrix with real identities, instead of only the scenarios someone scripted.
4. Send developers only confirmed exploits. Each comes with evidence and the data it exposed. Everything that can't be exploited is cleared.
5. Report exploits cleared, not checks passed. Rerun after every fix. The board sees how much of the footprint an attacker could use, and how fast that number is falling.

apisec vs 42Crunch: frequently asked questions

What is the difference between apisec and 42Crunch?

42Crunch audits OpenAPI and GraphQL contracts, scans running APIs for conformance to them, and enforces them at runtime with its API Firewall. apisec proves which weaknesses an attacker can actually exploit by running attacks against the live application, with or without a contract, and records each as confirmed, cleared or blocked with replayable evidence.

Is apisec an alternative to 42Crunch?

For teams that want proof of what an attacker can exploit, yes. apisec generates and runs exploits across the whole application, not only the API surface, and delivers SAST and SCA reports too. 42Crunch remains strong for contract governance and runtime enforcement; apisec answers whether the implementation actually holds up to an attacker.

How does BOLA testing differ between apisec and 42Crunch?

42Crunch can test BOLA and BFLA through scenarios you define in the scan configuration, listing the users, objects and functions involved. apisec generates authorization tests automatically from its graph of the application, across the full roles-and-permissions matrix, using real identities, so coverage doesn't depend on which scenarios someone wrote.

Does apisec need an OpenAPI contract?

No. apisec builds its picture from API gateways, API platforms, cloud infrastructure, SAST and SCA, then tests the running application. That matters for APIs with stale or missing contracts and for third-party and cloud framework code you never receive. When a contract or source exists, apisec uses it to enrich the App Model.

Does apisec replace an API firewall?

No. apisec is a testing platform, not a firewall. It proves which weaknesses are exploitable so they're fixed at the source, then reruns the same exploit to confirm each fix. Teams that want runtime enforcement of API contracts can use a gateway or API firewall alongside apisec.

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