APIs are now the primary attack surface for most applications. Industry research consistently shows that the large majority of organizations have experienced an API security issue in the past year, and a significant share have delayed a rollout because of API security concerns. Generic web application firewalls (WAFs) and API gateways weren’t built to catch what actually goes wrong with APIs: business logic abuse, authenticated attackers moving through an application, and endpoints nobody documented.
This list covers enterprise-grade, API-native platforms rather than general WAFs or gateways with API features added on. If you read our 2025 list, some names here will look different. There’s been a merger, an acquisition, and several rebrands since then.
What to Look For in an API Security Platform
A useful API security platform does three things well: it finds every API in your environment, including shadow and zombie APIs; it detects business logic abuse that signature-based tools typically miss; and it enforces protection at runtime without breaking legitimate traffic.
Beyond that baseline, here’s what separates the stronger platforms:
- Discovery and inventory: continuous, not a quarterly snapshot. New APIs ship every week.
- Shadow and zombie API detection: undocumented and deprecated endpoints are common attacker entry points because no one is monitoring them.
- API posture management: checks whether APIs are configured securely, not just whether they’re visible.
- OWASP API Top 10 coverage: BOLA, broken authentication, broken object-property authorization, unrestricted resource consumption, business-flow abuse, SSRF, misconfiguration, improper inventory management, and unsafe API consumption. This is the standard benchmark, and platforms should map their coverage against it directly.
- Business logic abuse detection: harder to catch than most vulnerabilities because the requests look valid on their face.
- Runtime blocking: detecting a problem isn’t the same as stopping it.
- Continuous testing and CI/CD integration: security checks that run before code ships.
- Deployment flexibility: SaaS, on-prem, or hybrid, depending on data residency and compliance requirements.
- Compliance reporting: audit-ready evidence, not just alerts.
- AI and MCP security: as AI agents start calling APIs on their own, this is becoming a standard requirement rather than an extra.
One thing worth knowing before evaluating vendors: authentication alone doesn’t protect an API. Most attackers already hold valid credentials by the time they reach an API, whether stolen, purchased, or issued through a compromised account, and a large share of API attacks target external-facing endpoints that are already behind an auth check. So the question isn’t whether a platform can verify a user is authenticated. It’s whether the platform can tell when an authenticated user is doing something a legitimate user never would.
The Top 10 API Security Companies in 2026
1. AppSentinels
Full-lifecycle API security platform covering discovery, continuous testing, runtime threat detection, and remediation.
- Business Logic Graphs map user journeys and workflows to catch fraud and abuse that signature-based rules miss
- Automated test-case generation and continuous API security testing
- PII and sensitive-data discovery across the API surface
- Correlates suspicious activity back to specific users or attacker groups
- Deploys as SaaS, on-premises, or hybrid, with on-prem options that keep AI/ML security models inside the organization’s environment
- Secures over 150,000 unique API endpoints and 250+ billion API calls
Best fit: Enterprises that need business-logic protection, deployment control, and a platform that scales from API security into AI/agent security without adding a separate tool.
Visit AppSentinels for more information.
2. Salt Security
API-native platform built around behavioral analytics.
- Baselines normal API traffic and flags deviations, correlating suspicious activity back to a specific attacker rather than treating each request as isolated
- Continuous API discovery, sensitive-data exposure analysis, and posture governance
- In Salt’s own traffic data, 54% of observed attack attempts involved API8 (security misconfiguration) and 27% involved API1 (BOLA)
- Recently expanded into agentic security, adding visibility into AI agents and their API interactions
Visit Salt Security for more information.
3. Traceable AI (Harness)
Merged with Harness in March 2025; now sold as Harness WAAP by Traceable.
- Distributed tracing, API discovery, and data-flow analytics
- Behavioral threat detection bundled with WAF, bot protection, and DDoS defense under one WAAP platform
- AI-specific security: discovery of AI components, testing against OWASP’s LLM risk categories, and prompt-injection protection
Visit Traceable AI for more information.
4. Wallarm
Protects a broad range of API protocols under one platform: REST, GraphQL, gRPC, SOAP, and WebSocket.
- Defends against the OWASP API Top 10, automated abuse, account takeover, and AI-targeted attacks
- Blocks traffic inline in real time without requiring a formal API specification, so it can discover and protect undocumented APIs
- Runs on a Wallarm Filtering Node paired with Wallarm Cloud
- Managed cloud and hybrid deployment options, with SIEM and alerting integrations
Visit Wallarm for more information.
5. Cequence Security
Started in API bot management before expanding into full API security.
- Unified API Protection spans discovery, inventory, posture management, testing, remediation, bot management, WAF, and DDoS protection
- Uses behavioral intelligence to protect APIs, applications, and AI agents from bots, business logic abuse, and fraud
- Governance layer for continuous risk assessment and compliance reporting
Visit Cequence Security for more information.
6. Akamai API Security (formerly Noname Security)
Akamai acquired Noname Security in June 2024 for approximately $450 million, folding its technology into Akamai API Security.
- Discovery of shadow and zombie APIs, plus API posture management
- Runtime protection and API attack detection
- Combines Noname’s API-specific capabilities with Akamai’s edge network, CDN, WAF, DDoS, and bot-defense infrastructure
- Best suited to organizations already running on Akamai’s edge and application security stack, since much of the value comes from that integration
Visit Akamai API Security for more information.
7. Imperva
Unified API security built around real-time detection and response.
- API discovery, risk assessment, and sensitive-data classification
- Real-time detection for BOLA-prone, deprecated, and unauthenticated APIs
- Integrates with Imperva’s own WAF, CDN, and attack analytics, plus third-party SIEM/SOAR tools
- Deployment options include cloud-managed and self-managed API Security Anywhere, covering on-premises, cloud, and hybrid environments
Visit Imperva for more information.
8. 42Crunch
OpenAPI-centric platform that pushes API security into the design and development stage.
- API Security Audit scans OpenAPI definitions for security and specification weaknesses before code ships
- Dynamic API Scan tests running APIs against their contract
- API Firewall enforces security policies derived directly from the API specification
- Effectiveness depends on how complete and current the OpenAPI definitions are; contract-based controls are only as strong as the contract itself
Visit 42Crunch for more information.
9. APIsec
Automated API security testing platform focused on continuous, pre-production validation.
- Generates and runs thousands of test cases tailored to an organization’s specific API architecture
- Testing covers business-logic vulnerabilities and role-based access-control paths that static scans typically miss
- Integrates with API gateways and CI/CD pipelines; scanners can run as lightweight Docker containers
- Produces automated, on-demand penetration-test reports that can support recurring audit and release cycles
Visit APIsec for more information.
10. Levo.ai
Full-lifecycle API observability and security platform, with a strong AI-workload angle.
- Sensor component passively captures traffic using eBPF, PCAP, or log parsing; Satellite processes that traffic into an API catalog and security-test plans
- Schema-drift detection and automatic OWASP API Top 10 testing in CI/CD
- Detects PHI, PII, and secrets not just in API payloads but in AI prompts, embeddings, and vector queries, without sending that data to the cloud, according to the vendor
- Zero-code deployment model
Visit Levo.ai for more information.
How to Choose the Right API Security Vendor
Match the platform to what’s actually causing you risk, not to the vendor with the longest feature list.
- If business logic abuse, fraud, and authenticated attacker behavior are your main concern, prioritize platforms with strong behavioral detection and runtime enforcement.
- If your team already treats OpenAPI specs as the source of truth, a contract-first platform gives you shift-left governance without adding a separate testing layer.
- If you need to consolidate API security with WAF, bot management, DDoS defense, and CDN controls, a WAAP-oriented platform reduces the number of tools you’re running.
Whichever direction you lean, confirm the platform actually covers the surface you care about: private APIs, shadow and zombie endpoints, GraphQL, WebSocket, and increasingly, AI and MCP endpoints. A platform that only discovers documented REST APIs is solving half the problem.
Before signing anything, ask vendors for specifics: false-positive rates, runtime latency under load, what the blocking controls actually do (versus just alerting), deployment models, how accurate their API inventory is in practice, and what it integrates with (SIEM, SOAR, CI/CD, API gateways, ticketing). Don’t rank vendors by feature count. Discovery, posture management, testing, runtime enforcement, and business-logic protection are different capabilities, and a platform can be strong in one and weak in another.
Choosing a Platform for 2026 and Beyond
API attacks aren’t slowing down, and most of them are coming from sources that look legitimate on paper. The vendors on this list approach the problem from different angles: some lead with behavioral detection, some with contract governance, some with consolidation into a broader WAAP stack.
AppSentinels was built around the harder problem in that list: catching business logic abuse and fraud that never trips a signature-based rule, with the deployment flexibility regulated enterprises need and the AI/agent security coverage that’s quickly becoming a requirement rather than an extra. If that’s the gap you’re trying to close, it’s worth a look.
Get in touch with us for a demo on API security.
Frequently Asked Questions
What is API security?
API security is the practice of protecting APIs from misuse, abuse, and attack, covering discovery of every API in an environment, testing for vulnerabilities, and runtime protection against threats like broken authorization, business logic abuse, and data exposure.
What’s the difference between an API gateway or WAF and a dedicated API security platform?
Gateways and WAFs manage traffic and block known attack patterns, but they generally can’t detect business logic abuse, find undocumented or shadow APIs, or tell a legitimate authenticated user apart from an attacker using valid credentials. Dedicated API security platforms are built specifically to close that gap.
What is a shadow API or zombie API?
A shadow API is one that exists and is in use but isn’t documented or tracked by the security team, often created during fast development cycles. A zombie API is an old or deprecated version that’s still live and reachable, even though it’s no longer meant to be in use. Both are common attacker entry points because no one is actively monitoring them.
What is the OWASP API Security Top 10?
It’s the industry-standard list of the most critical API security risks, published by OWASP and last updated in 2023. It includes risks like broken object-level authorization (BOLA), broken authentication, unrestricted resource consumption, and improper inventory management. Most enterprise API security platforms map their coverage directly against this list.
Can API gateways alone protect against API attacks?
No. API gateways handle routing, rate limiting, and basic authentication, but they don’t detect business logic abuse or behavioral anomalies in authenticated traffic. Most API attacks now come from sources that pass authentication checks, so protection built only around access control misses the majority of real-world attack activity.
How do API security platforms handle AI agents and MCP endpoints?
As AI agents increasingly call APIs autonomously, platforms are extending discovery and protection to cover AI-specific risks: prompt injection, unsafe tool use, and data exposure through prompts, embeddings, or vector queries. This is becoming a standard requirement for API security platforms rather than a separate category of tooling.
