API Security Testing powered by Sift
Continuously validate API authorization controls, business logic, AI agent APIs, and runtime behavior using Sift, Aptori's proprietary semantic runtime validation engine built for fast, efficient CI/CD security testing.
What is API Security Testing?
API security testing validates whether APIs enforce authentication, authorization, data access, input handling, business logic, and runtime security controls correctly across real application workflows.
Authentication & Authorization
Validate identity, session handling, role enforcement, object ownership, and tenant isolation.
BOLA & BOPLA
Test whether users can access objects or properties they should not be allowed to view or modify.
Business Logic Testing
Exercise real workflows to identify abuse cases, broken assumptions, and unexpected API behavior.
Endpoint discovery is not API security testing.
Modern API risk lives in authorization decisions, object relationships, business workflows, partner access, AI agent behavior, and runtime execution. Traditional scanners often find endpoints and generic issues, but they struggle to validate whether APIs behave securely in real application context.
The semantic runtime validation engine for APIs.
Sift is Aptori's proprietary API security testing engine, purpose-built to continuously validate API security throughout the software development lifecycle. It builds semantic understanding of applications, APIs, authorization models, object relationships, and business workflows so teams can identify exploitable API risks before release.
Semantic API Modeling
Sift understands APIs in the context of application behavior, roles, objects, tenants, identities, and workflows.
Authorization Validation
Validate BOLA, BOPLA, object ownership, identity propagation, partner access, and multi-tenant boundaries.
CI/CD Ready
Sift is engineered for fast, efficient validation in development and release pipelines without slowing teams down.
How Sift validates API security.
Sift combines source context, API definitions, authentication flows, and runtime context to perform semantic runtime validation of authorization controls and business workflows.
Source code, API definitions, recorded authentication flows, runtime context, and application behavior.
Build a semantic model of objects, roles, endpoints, workflows, identities, and authorization rules.
Exercise authorization, object access, business logic, workflow integrity, and exploit paths.
Prioritize verified risk and provide root cause context with developer-ready remediation guidance.
Not just API scanning. Semantic API validation.
Traditional API scanners often discover endpoints and run generic payloads. Sift validates how APIs behave in context.
What modern API security testing must validate.
API security requires more than endpoint discovery. Explore the core areas security and engineering teams must continuously validate across modern applications, AI workflows, and enterprise API ecosystems.
Protect APIs from unauthorized object access and broken object-level authorization vulnerabilities.
Explore BOLA Prevention → API Authorization TestingValidate role enforcement, object ownership, tenant isolation, and access controls.
Explore Authorization Testing → Business Logic Security TestingValidate workflow integrity and detect abuse paths that traditional scanners miss.
Explore Business Logic Testing → API Business Logic VulnerabilitiesUnderstand how attackers exploit workflows, approvals, transactions, and business processes.
Explore API Logic Risks → Semantic API Security TestingLearn how semantic understanding enables deeper API testing and runtime validation.
Explore Semantic API Testing → API Security Testing in CI/CDIntegrate continuous API validation into modern software delivery pipelines.
Explore CI/CD API Testing → API Security for AI AgentsSecure APIs used by AI applications, agents, tool-calling workflows, and MCP integrations.
Explore Agent API Security → API Security Testing vs API SecurityUnderstand the differences between testing, monitoring, discovery, and protection.
Explore the Comparison → Semantic Runtime ValidationSee how runtime validation proves exploitability and drives remediation.
Explore Runtime Validation →From API testing to proof of exploitability.
Sift powers semantic runtime validation for APIs, enabling teams to focus on vulnerabilities that can actually be exploited in running applications and workflows.
Identify authorization, business logic, data exposure, and runtime API risks.
Validate the issue under realistic runtime conditions and API workflows.
Prioritize verified risk and guide developers to remediation.
Continuous API security validation without slowing development.
Sift was engineered for modern software delivery pipelines. It enables security and engineering teams to validate API behavior during development, pull requests, CI/CD, staging, and release workflows so exploitable API vulnerabilities can be fixed before production.
API security for AI applications and agents.
AI applications and agents increasingly call APIs, invoke tools, chain workflows, and act on behalf of users. Sift validates whether API access, authorization, and runtime behavior remain secure when software becomes agentic.
Agent-to-API Access
Validate that agents can only access APIs, tools, objects, and actions permitted by policy and identity context.
Tool Calling & MCP Workflows
Test API behavior when AI systems invoke tools, call services, and execute multi-step workflows.
Context-Aware Authorization
Verify that user, role, tenant, and application context are enforced consistently across API actions.
Explore API Security for AI Agents →Built for API security in complex enterprise environments.
Sift helps organizations validate API security across industries where authorization, workflow integrity, speed, and compliance matter most.
Telecommunications
Validate OSS, BSS, partner APIs, network orchestration APIs, and multi-tenant telecom workflows.
Financial Services
Test payment APIs, open banking APIs, customer data access, and PCI DSS-aligned controls.
SaaS Platforms
Validate multi-tenant object ownership, role-based access, account boundaries, and data exposure controls.
AI Applications
Secure APIs used by agents, AI assistants, tool-calling workflows, and autonomous application behavior.
Connect API security testing to the broader application security program.
API security findings become more valuable when they are correlated with AI SAST, ASPM, runtime validation, Kubernetes security, compliance, and continuous vulnerability management.
See how API security fits into Aptori’s unified platform.
Explore the Platform → Application Security Posture ManagementCorrelate API risk with broader application security posture.
Explore ASPM → Semantic Runtime ValidationUnderstand how Aptori proves exploitability in runtime.
Explore Runtime Validation → AI SASTSecure source code and APIs together with semantic analysis.
Explore AI SAST → Continuous Vulnerability ManagementPrioritize, remediate, and verify security risk continuously.
Explore CVM → Kubernetes Security AssuranceValidate cloud-native infrastructure supporting your APIs.
Explore Kubernetes Assurance → Autonomous Pen TestingSimulate attacker behavior and validate exploitability continuously.
Explore Autonomous Pen Testing → Secure-by-DesignBuild API security into development and release workflows.
Explore Secure-by-Design → Application Security ComplianceGenerate evidence for UK TSA, EU CRA, NIS2, PCI DSS, and SOC 2.
Explore Compliance →API Security Testing and Sift questions.
What is API security testing?
API security testing validates authentication, authorization, data exposure, business logic, abuse paths, configuration, and runtime behavior to identify and remediate API vulnerabilities.
What is Sift?
Sift is Aptori's proprietary semantic runtime validation engine for API security testing. It validates authorization controls, business logic, runtime behavior, exploitability, and remediation workflows.
Can Sift integrate into CI/CD pipelines?
Yes. Sift is designed for modern CI/CD workflows so teams can continuously validate API security during development, pull requests, build pipelines, staging, and release validation.
What is semantic runtime validation?
Semantic runtime validation uses semantic understanding of applications, APIs, authorization models, and workflows to validate security behavior under real runtime conditions.
How does Sift validate API authorization controls?
Sift models identities, roles, objects, tenants, and workflows to validate whether API authorization controls enforce object ownership, property access, and tenant isolation correctly.
How does API security testing support AI applications and agents?
API security testing validates APIs used by AI applications, agents, tool-calling workflows, MCP integrations, and autonomous systems.
How does API security testing differ from API security monitoring?
API security testing proactively validates whether APIs can be exploited, while monitoring observes API traffic and behavior after deployment.
How does API security testing support secure-by-design development?
API security testing helps teams validate API behavior during development and release workflows so exploitable defects can be fixed before production.
Validate API behavior before attackers exploit it.
Sift helps teams move from generic API scanning to semantic runtime validation, proving exploitability, prioritizing verified risk, and accelerating remediation.
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