API Discovery: How to Discover, Inventory & Secure APIs

Modern organizations operate APIs across cloud environments, microservices, SaaS platforms, mobile applications, internal systems, third-party integrations and development environments. As these ecosystems expand, the APIs documented in an official catalogue may represent only part of the actual attack surface.

Endpoints can remain active after documentation becomes outdated. Development APIs may reach production. Legacy versions can stay accessible after replacement. Teams can create APIs outside centralized management processes, while acquisitions and distributed engineering models introduce systems security teams may not know exist. Google Cloud describes shadow APIs as undocumented or unmanaged APIs that can create security and governance risks, while OWASP emphasizes the importance of maintaining accurate inventories of API hosts and deployed versions.

The security problem is straightforward:

You cannot consistently test, monitor or govern an API you do not know exists.

This guide explains API discovery, API inventory creation, shadow APIs, discovery methods, automation, API discovery tools, attack-surface visibility and the governance processes required to keep API visibility current.

What Is API Discovery?

API discovery is the process of identifying APIs and API endpoints across an organization’s environments and recording them in an inventory so they can be managed, tested, monitored and secured.

IBM describes API discovery as finding both documented and hidden APIs and compiling those discoveries into an inventory. Modern discovery therefore goes beyond searching an existing developer portal or API catalogue. It attempts to identify what is actually operating across the environment.

API discovery should cover two broad groups.

Known APIs include APIs that are documented, registered, catalogued and managed through approved processes.

Unknown or unmanaged APIs may include:

• Shadow APIs
• Undocumented APIs
• Forgotten endpoints
• Legacy APIs
• Deprecated versions
• Development APIs
• APIs operating outside normal gateways or management processes

This distinction matters because security controls built around a documented API estate can leave significant gaps when the actual deployed environment is different from the official inventory.

What Does API Discovery Identify?

A useful discovery process should identify more than an API URL.

Depending on the available data, organizations should try to establish:

• API hosts
• Endpoints
• Methods
• Versions
• Protocols
• Environment
• Application or API owner
• Authentication mechanism
• External or internal exposure
• Data handled
• Dependencies
• Lifecycle status

OWASP recommends maintaining an inventory of API hosts and deployed versions because multiple versions and incomplete documentation can expand the attack surface and leave deprecated endpoints exposed.

The richer this context becomes, the more useful discovery is for security prioritization.

Why Is API Discovery Important for API Security?

API discovery provides the visibility required for nearly every other API security activity.

The relationship can be summarized as:

No visibility → No reliable inventory → Inconsistent controls → Unmanaged attack surface

An unknown API may not receive the same security treatment as an approved production endpoint. It may escape penetration testing, operate outside expected gateway controls, use outdated authentication, expose sensitive information or run without centralized monitoring.

OWASP’s API9:2023 guidance specifically highlights problems caused by incomplete awareness of API hosts, versions and environments. It notes that running multiple versions increases the attack surface and that outdated or incomplete documentation creates security blind spots.

Unknown ownership compounds the problem. When nobody knows which team operates an API, patching, credential rotation, access changes and retirement become harder to coordinate.

API discovery helps answer basic security questions:

• What APIs exist?
• Which are externally accessible?
• Which process sensitive information?
• Which versions are still active?
• Which APIs have no identified owner?
• Which require immediate security testing?
• Which should be retired?

API Discovery and Attack Surface Reduction

API attack surface discovery gives security teams a clearer picture of which API assets could potentially be reached or abused.

Discovery itself does not reduce risk automatically. It enables the decisions that do.

Once an API has been identified, teams can decide whether it should be:

• Tested
• Monitored
• Restricted
• Added to a gateway
• Assigned an owner
• Brought under governance
• Updated
• Deprecated
• Completely retired

Google Cloud’s API Observation capability uses automated discovery to compare observed API activity with known APIs, specifically to help surface undocumented and unmanaged APIs.

The practical value of discovery is therefore not simply counting endpoints. It is converting unknown attack surface into manageable security assets.

What Is an API Inventory?

An API inventory is a continuously maintained record of APIs, endpoints and associated security and operational context across an organization.

It should be more useful than a spreadsheet containing URLs.

A mature API asset inventory or API endpoint inventory provides enough information for security, development and governance teams to understand what an API does, how exposed it is and what should happen to it next.

What Should an API Inventory Contain?

Useful inventory fields can include:

• API name
• Host or endpoint
• API owner
• Business purpose
• Application
• Environment
• API version
• Protocol
• Authentication mechanism
• Exposure level
• Data classification
• Dependencies
• Third-party integrations
• Lifecycle status
• Last security review
• Monitoring status
• Deprecation date where applicable

OWASP recommends inventorying API hosts, documenting environments such as production, staging, testing and development, identifying expected network access, tracking versions, and recording integrated services and exchanged data.

API Discovery vs API Inventory

The distinction is simple:

API discovery = finding APIs.

API inventory = organizing and maintaining information about those APIs.

Discovery produces visibility. Inventory turns that visibility into something security and engineering teams can manage.

A discovery process without an inventory can repeatedly find the same APIs without creating accountability. An inventory without ongoing discovery can gradually become outdated.

The two capabilities should therefore operate together.

Types of APIs Organizations Need to Discover

API discovery should not be limited to internet-facing production endpoints.

Public APIs

Public APIs are intentionally exposed externally to developers, customers or other consumers.

Because they are reachable beyond the organization’s internal environment, their authentication, authorization, rate controls and data exposure deserve careful review.

Internal APIs

Internal APIs connect applications, services and microservices inside the organization’s environment.

Internal does not mean inherently trusted. Modern security architectures increasingly avoid relying on network location alone as proof that an API request is legitimate.

Partner APIs

Partner APIs are exposed to or consumed by specific business partners.

Their security depends not only on endpoint configuration but also on credential scope, ownership, partner lifecycle and access termination.

Third-Party APIs

Organizations also consume APIs operated by external providers.

OWASP’s Unsafe Consumption of APIs category warns that developers may place too much trust in third-party API responses and apply weaker validation or transport controls than they would to user-provided input.

Shadow APIs

Shadow APIs operate outside expected documentation or management processes.

They are particularly important for discovery because teams may have no reliable inventory entry describing their purpose, owner or security controls.

Deprecated and Legacy APIs

Older API versions may remain reachable after newer versions replace them.

OWASP notes that maintaining multiple versions expands the attack surface and recommends maintaining accurate version inventories and retirement strategies.

Development and Testing APIs

Development, staging and testing endpoints can become security risks when they are unintentionally exposed or use weaker controls than production systems.

Discovery should include these environments because attack surface is determined by what is reachable, not by what was intended to be production.

What Are Shadow APIs?

Shadow APIs are APIs or endpoints operating outside an organization’s approved documentation, inventory or management processes.

Google Cloud describes shadow APIs as undocumented or unmanaged APIs that can create security and governance risk. Its API Observation functionality compares discovered activity against APIs already known in API hub to identify those gaps.

How Shadow APIs Are Created

Shadow APIs can emerge in several ways:

• Developers create temporary endpoints.
• Teams deploy APIs without centralized registration.
• Legacy systems remain active.
• Test APIs become externally reachable.
• Acquisitions introduce previously unknown applications.
• Microservices evolve faster than documentation.
• An API bypasses the organization’s standard gateway.
• Older versions remain accessible during migration.

Most of these scenarios do not require malicious intent. They are often the result of normal development speed combined with fragmented ownership.

Why Shadow APIs Are a Security Risk

An unmanaged API may have:

• Unknown external exposure
• Weak or missing authentication
• Outdated dependencies
• Inconsistent authorization
• No centralized monitoring
• No recent security testing
• No known owner
• Sensitive data exposure

Google Cloud specifically notes that forgotten APIs can create risk because they may be outdated, unsecured or unmonitored.

Shadow APIs vs Zombie APIs

The terms overlap but describe different conditions.

A shadow API is active but undocumented or unmanaged.

A zombie API is obsolete or deprecated but remains accessible.

A zombie API can also be a shadow API if its continued existence is no longer documented or known to security teams.

Undocumented, Unknown and Unmanaged APIs: What’s the Difference?

These terms are related but should not be treated as interchangeable.

Undocumented API

An undocumented API exists but is missing from current official documentation.

The development team may know it exists even though the API catalogue does not.

Unknown API

An unknown API is not known to the team responsible for security, governance or API management.

The API may still be documented somewhere locally.

Unmanaged API

An unmanaged API operates outside the security, lifecycle or operational controls the organization expects APIs to follow.

An API can therefore be documented by developers but still be unknown to security.

Likewise, an API can be known to security but remain unmanaged because it has not yet been onboarded into testing, monitoring or governance processes.

This distinction matters because undocumented API discovery solves a documentation gap, while unknown API discovery and unmanaged API identification may reveal broader organizational visibility and governance problems.

How Does API Discovery Work?

There is no single discovery source that provides perfect visibility.

Organizations typically gain better coverage by combining multiple methods.

API Documentation and Specification Analysis

Existing artifacts provide the easiest starting point.

Sources can include:

• OpenAPI specifications
• Swagger documentation
• Developer portals
• API catalogues
• Application documentation

This approach provides useful context but finds only APIs teams have already documented.

It therefore cannot independently solve the shadow API problem.

API Gateway and Management Data

API gateways and management platforms provide valuable records of APIs already routed through them.

Teams can inspect:

• Registered API proxies
• Routes
• Policies
• Traffic
• Versions
• Consumers

The limitation is structural: APIs operating outside the gateway may never appear.

API management data should therefore contribute to discovery without being treated as the complete API inventory.

Network and Runtime Traffic Analysis

Runtime discovery analyzes real API communication.

This can identify endpoints that documentation or gateways missed because the discovery source reflects actual traffic rather than intended architecture.

Google Cloud’s Shadow API Discovery observes API activity and compares observed APIs with known APIs stored in API hub.

Runtime analysis can be particularly valuable in distributed environments where microservices and dynamic infrastructure change frequently.

Code and Repository Analysis

Source code, configuration and infrastructure definitions can reveal API endpoints before or during deployment.

Potential sources include:

• Application repositories
• Infrastructure-as-code
• Routing configuration
• Service definitions
• API specifications
• Deployment manifests

This gives organizations an opportunity to discover assets earlier in the development lifecycle rather than waiting until production traffic appears.

External Attack Surface Discovery

An outside-in approach examines internet-facing infrastructure for API endpoints that an external actor could potentially reach.

This complements internal discovery by answering:

What does our API attack surface look like from outside the organization?

External discovery is particularly useful for identifying forgotten hosts, legacy versions or APIs deployed through business units that central security processes did not capture.

Manual vs Automated API Discovery

Organizations can discover APIs manually, automatically or through a combination of both approaches.

Manual API Discovery

Manual discovery can involve:

• Reviewing documentation
• Interviewing application owners
• Checking API gateways
• Reviewing repositories
• Reviewing architecture diagrams
• Maintaining inventories manually

Human investigation provides valuable business context. Application owners can explain what an API does, whether it is still needed and which system depends on it.

The limitation is scale.

Manual inventories become difficult to maintain when APIs change continuously across cloud, microservice and DevOps environments.

They are also more likely to miss shadow APIs because teams can only document what they know to look for.

Automated API Discovery

Automated API discovery continuously analyzes sources such as:

• Runtime traffic
• Gateway data
• Cloud infrastructure
• Code and specifications
• External exposure

Google Cloud’s API Observation documentation explicitly describes automated processes for finding and cataloguing known and unknown APIs into a unified view.

Automation provides:

• Greater scale
• Faster detection of new endpoints
• Continuous visibility
• Better identification of unmanaged APIs
• More frequent inventory reconciliation

The best operating model is usually:

Manual processes provide context, while automated API discovery provides the continuous coverage required for dynamic API environments.

API Discovery Process: Step by Step

A structured discovery process turns asset visibility into actionable security information.

Step 1: Define the Discovery Scope

Determine which environments and business units need to be covered.

Include:

• Cloud accounts
• Applications
• Gateways
• Networks
• Code repositories
• Kubernetes or microservice environments
• Business units
• Partner-facing services

Do not assume the discovery scope should be limited to production.

Step 2: Collect Existing API Records

Gather available:

• API inventories
• OpenAPI specifications
• Developer documentation
• Gateway records
• Architecture diagrams
• Service catalogues

This creates the approved or expected baseline.

Step 3: Discover APIs Across Runtime Environments

Analyze actual infrastructure and communication to identify APIs that are operating now.

Runtime evidence can expose endpoints absent from documentation.

Step 4: Identify Shadow and Unknown APIs

Compare discoveries against approved records.

Investigate discrepancies such as:

• New endpoints
• Unexpected hosts
• Unregistered versions
• Unknown owners
• Services operating outside gateways

Step 5: Classify APIs

Classify each API according to:

• Environment
• Exposure
• Business importance
• Data sensitivity
• Lifecycle stage
• Authentication type

Classification helps distinguish urgent security risks from lower-risk inventory gaps.

Step 6: Identify Owners

Every important API should have an accountable technical or business owner.

Without ownership, remediation and retirement can stall even after risk has been identified.

Step 7: Add APIs to the Central Inventory

Bring discovered APIs into the organization’s shared inventory rather than leaving discovery results isolated inside individual tools.

Step 8: Assess Security Risk

Prioritize APIs that are:

• Internet-facing
• Unknown
• Unauthenticated
• Privileged
• Sensitive-data related
• Legacy
• Unmonitored

These assets should move quickly into testing and remediation workflows.

Step 9: Continuously Monitor for Changes

API discovery should not stop after the first inventory exercise.

New APIs and versions should feed into the inventory continuously where possible so the catalogue remains aligned with the deployed environment.

How to Build and Maintain an API Inventory

Finding APIs is only the beginning. Organizations also need an inventory that remains operationally useful.

Establish a Single Source of Truth

Avoid maintaining independent API spreadsheets across development, security and operations teams.

A shared inventory provides a clearer reference for ownership, security status and lifecycle decisions.

Record Security Context

Include context such as:

• Authentication method
• Exposure
• Sensitive data
• Ownership
• Dependencies
• Version
• Monitoring
• Security-review status

The goal is to move from “this endpoint exists” to “this endpoint exists and here is why its risk matters.”

Assign Ownership

Every API should have identifiable accountability.

Ownership supports patching, access decisions, remediation and retirement.

Track the API Lifecycle

A useful inventory should follow:

Development → Testing → Production → Version change → Deprecation → Retirement

API lifecycle status helps teams distinguish active assets from APIs that should no longer be reachable.

Continuously Reconcile Inventory

Compare what documentation says exists with what runtime or infrastructure discovery shows actually exists.

This reconciliation is one of the most effective ways to identify shadow and forgotten APIs.

Remove Stale Inventory Records

Inventory hygiene matters too.

A catalogue filled with retired endpoints that are no longer deployed creates noise and makes real security changes harder to see.

An API inventory updated once a year quickly becomes another form of outdated documentation.

API Discovery and Sensitive Data Visibility

API discovery becomes more valuable when organizations understand not only where APIs exist, but also what information those APIs handle.

Useful classifications can include:

• Personal information
• Financial records
• Credentials
• Confidential business information
• Regulated data
• Authentication information

OWASP’s inventory guidance recommends documenting integrated services, the data exchanged with them and the sensitivity of those data flows.

This produces a useful security model:

API → Endpoint → Data → Exposure → Risk

An undocumented API returning public product information may require remediation, but an undocumented internet-facing endpoint exposing customer data should normally receive much higher priority.

Data context turns API asset discovery into risk-based discovery.

API Discovery and Identity Visibility

API discovery answers:

What APIs exist?

Identity governance answers:

Who or what can access the applications and resources connected to those APIs?

Combining the two provides deeper security context:

API → Identity → Permission → Resource → Data

Relevant identities can include:

• Employees
• Customers
• Applications
• Service accounts
• Cloud workloads
• Automation
• AI agents
• Privileged administrators

This matters because an API can be known and technically secured while still being reachable by identities with excessive permissions.

SecurEnds’ identity-governance capabilities focus on areas such as access visibility, entitlement review and governance of human and non-human identities. Its non-human identity offering provides centralized inventory and recurring access reviews for service accounts and other machine identities.

Asset visibility and identity visibility therefore solve different parts of the same security problem.

API Discovery Tools: Key Capabilities to Look For

When evaluating API discovery tools or an API discovery platform, focus on what visibility the product can create rather than simply how many APIs it reports.

Continuous Discovery

Can the platform detect newly deployed APIs without waiting for a manual inventory review?

Dynamic environments benefit from continuous rather than periodic discovery.

Shadow API Detection

Can the platform compare observed APIs against approved inventories or documentation?

This is essential for identifying unmanaged endpoints.

Google Cloud’s API Observation, for example, compares discovered API activity with known APIs in API hub to surface shadow APIs.

Multi-Environment Coverage

Evaluate visibility across environments relevant to your organization, such as:

• Cloud
• Kubernetes
• Microservices
• API gateways
• Internal networks
• Hybrid infrastructure

SecurEnds’ current API Discovery offering states that its discovery capabilities are designed for APIs across cloud, edge, on-premises and hybrid environments and cover known, unknown, internal and external APIs.

API Classification

Discovery becomes more actionable when APIs can be categorized by exposure, environment, lifecycle and risk.

Sensitive Data Identification

Understanding whether an API handles sensitive information helps prioritize testing and remediation.

API Version Visibility

The platform should help distinguish active, legacy and deprecated versions because unmanaged older versions can expand the attack surface.

Ownership and Context

Discovered endpoints should ideally be linked to applications, services or accountable owners.

Discovery without ownership can create another large list that nobody knows how to remediate.

Security Tool Integration

Discovery results should be able to feed broader workflows such as:

• API security testing
• Vulnerability management
• Monitoring
• Threat detection
• Runtime protection
• Security remediation

Discovery has the most value when it triggers action.

API Discovery Tools vs API Management Platforms

API discovery and API management overlap, but they are not the same capability.

API Discovery	API Management
Finds API assets	Publishes and manages APIs
Identifies unknown APIs	Primarily manages known APIs
Improves API visibility	Controls lifecycle and traffic
Helps identify shadow APIs	Governs onboarded APIs
Supports security inventory	Supports API operations and consumption

API management platforms can contribute significant inventory information because they already know about APIs routed through the management layer.

However, APIs that bypass the platform may remain invisible.

Google Cloud’s own API Observation capability reflects this distinction by using observation and automated discovery to identify undocumented or unmanaged APIs rather than assuming managed APIs represent the complete estate.

The two capabilities therefore complement one another.

API Discovery vs API Security Testing

The distinction is equally important between discovery and security testing.

API discovery asks:

What APIs exist?

API security testing asks:

Are those APIs vulnerable or incorrectly protected?

The preferred workflow is:

Discover → Inventory → Prioritize → Test → Monitor → Govern

Security testing performed before discovery can still provide value, but it risks evaluating only the APIs already known to the testing team.

Discovery expands the testing scope by finding assets that might otherwise remain outside the assessment.

For the full testing process, see [Internal Link: API Security Testing].

API Discovery and OWASP API9:2023 Improper Inventory Management

OWASP API9:2023, Improper Inventory Management, directly reinforces the security importance of API discovery.

OWASP explains that APIs often expose many endpoints, making accurate documentation especially important. It also emphasizes maintaining proper inventories of API hosts and deployed versions to reduce exposure from deprecated versions and debug endpoints.

The risk can emerge when organizations lack accurate information about:

• API hosts
• Versions
• Environments
• Documentation
• Integrated services
• External exposure

OWASP recommends inventorying API hosts, documenting their environment, access expectations and versions, and maintaining information about integrated services and data flows.

How API Discovery Helps Reduce API9 Risk

Discovery supports API9 risk reduction by helping teams:

• Maintain host inventories
• Maintain version inventories
• Identify deprecated APIs
• Track production and non-production environments
• Reconcile documentation with deployed assets
• Find unknown endpoints
• Identify APIs requiring retirement

API discovery does not solve every OWASP API risk, but it provides the visibility needed to determine where other controls must be applied.

For deeper coverage of all ten categories, see [Internal Link: OWASP API Security].

Common API Discovery Challenges

API discovery is conceptually simple but operationally difficult.

Rapid API Development

New endpoints can be deployed faster than documentation and inventories are updated.

Distributed Ownership

Different product teams, regions and business units may create APIs independently.

Without shared discovery and governance, there may be no single view of the complete estate.

Multi-Cloud Complexity

APIs may operate across multiple cloud providers, SaaS environments and internal infrastructure.

Fragmented tooling makes centralized visibility harder.

Shadow APIs

Endpoints created outside standard processes may never enter the approved inventory.

Legacy Systems

Older applications may expose APIs that predate current documentation, security or ownership practices.

Ephemeral Infrastructure

Cloud-native workloads can be created and removed dynamically, making periodic static inventories less reliable.

Third-Party Dependencies

Security teams may know which internal APIs exist while having incomplete visibility into the external APIs consumed by applications.

Too Much Discovery Data

Discovery tools can create another operational challenge: volume.

Finding thousands of endpoints is useful only when teams can deduplicate, classify, prioritize and assign ownership.

The goal is not maximum asset count. It is accurate, actionable visibility.

API Discovery Best Practices

Organizations can improve API discovery by treating it as an ongoing security capability rather than an annual inventory exercise.

Maintain Continuous Discovery

Run discovery continuously or frequently enough to reflect how rapidly APIs change.

Combine Multiple Discovery Sources

Use specifications, gateways, runtime traffic, repositories, cloud data and external exposure rather than depending on a single source.

Do Not Limit Discovery to Production

Include development, staging, testing, internal and partner environments where they can create security exposure.

Assign an Owner to Every API

Ownership makes security findings actionable.

Maintain Version Visibility

Track older API versions and confirm that deprecated versions are actually retired.

Classify Sensitive APIs

Prioritize APIs based on data sensitivity, exposure and business importance.

Reconcile Discovered APIs Against Documentation

Differences between observed activity and approved inventories are often where shadow APIs appear.

Prioritize Shadow and Externally Exposed APIs

Unknown internet-facing APIs should normally receive rapid investigation because both exposure and governance status are unclear.

Integrate Discovery With Security Testing

Newly discovered APIs should enter testing workflows automatically where practical.

Integrate Discovery With Monitoring

Once an API is known, teams should determine whether runtime monitoring and alerting are appropriate.

Establish a Secure Retirement Process

Retirement should remove endpoints, credentials and associated permissions.

Continuously Update the Inventory

Discovery and inventory reconciliation should become part of normal API operations.

For broader implementation guidance, see [Internal Link: API Security Best Practices].

API Discovery Checklist

Use this checklist to evaluate API discovery coverage.

Coverage

• Public APIs are identified.
• Internal APIs are identified.
• Partner APIs are identified.
• Third-party APIs are recorded.
• Development and staging APIs are included.

Visibility

• Shadow APIs are identified.
• Undocumented APIs are identified.
• Unknown APIs are investigated.
• Legacy APIs are recorded.
• Deprecated API versions are identified.

Inventory

• API owners are recorded.
• Versions are documented.
• Environments are classified.
• Exposure is recorded.
• Sensitive data is classified.
• Authentication mechanisms are documented.
• Dependencies are recorded.

Security

• Internet-facing APIs are prioritized.
• Unknown APIs receive security review.
• High-risk APIs enter security testing.
• APIs requiring monitoring are identified.
• Deprecated APIs are securely retired.

Continuous Management

• New APIs can be identified regularly or automatically.
• Observed APIs are reconciled with documentation.
• Inventory changes are reviewed.
• Ownership gaps are remediated.
• Security teams receive relevant discovery findings.

From API Discovery to API Security: What Happens Next?

Discovery should trigger a broader API security workflow.

1. Discover

Identify known and unknown API assets across the environment.

2. Inventory

Capture ownership, versions, exposure, authentication and other relevant context.

3. Classify

Determine data sensitivity, business criticality and lifecycle status.

4. Prioritize

Identify APIs requiring urgent security attention, particularly unknown, externally exposed or sensitive-data endpoints.

5. Test

Assess authentication, authorization, configuration and application behavior.

[Internal Link: API Security Testing]

6. Monitor

Observe production activity for unusual usage, authentication failures and threat patterns.

7. Govern Access

Determine whether users, applications and machine identities have appropriate permissions to the applications and resources behind those APIs.

8. Retire

Remove obsolete endpoints, credentials and related access when APIs are no longer required.

This lifecycle turns discovery from an inventory exercise into a security control.

How Identity Governance Complements API Discovery

API discovery provides asset visibility.

Identity governance provides access visibility.

Together, these disciplines allow organizations to answer a broader set of questions:

• What APIs exist?
• Which applications expose them?
• Who can access those applications?
• What entitlements do users and machine identities hold?
• Who has privileged access?
• Is that access still justified?
• Are stale permissions present?
• Should access be removed?

The combined model becomes:

API → Identity → Permission → Resource → Data

Discovering an API identifies one part of the attack surface. Understanding the identities and permissions connected to the applications and resources behind that API provides another layer of security context.

SecurEnds’ identity-governance capabilities include access reviews and visibility into human and non-human identities. Its non-human identity capabilities support centralized inventories, ownership and recurring access reviews for service accounts.

This distinction is particularly important for machine-to-machine APIs because the identity making requests may be an application or service account rather than a human employee.

How SecurEnds Supports API Discovery and Access Visibility

SecurEnds can now be positioned directly in the API discovery layer as well as the identity-governance layer.

Its current API Discovery & API Security offering states that it provides discovery across cloud, edge, on-premises and hybrid environments and is designed to identify known, unknown, internal and external APIs. The product positioning combines API discovery with contextual security and risk assessment.

SecurEnds’ broader API Security portfolio also lists API Inventory & Discovery alongside Threat Detection, Schema & Specification Validation, Authentication & Authorization Vulnerabilities and API-to-API Adaptive MFA.

Alongside API asset visibility, SecurEnds’ identity-governance capabilities add visibility into entitlements and recurring access reviews for human and non-human identities.

This creates a useful security relationship:

API discovery identifies what exists. Identity governance helps determine who can access connected resources and whether that access remains appropriate.

[Internal Link: SecurEnds API Discovery]

[Internal Link: SecurEnds API Security]

[Internal Link: SecurEnds Non-Human Identity Management]

API Security Starts With Visibility

API security cannot be applied consistently to assets that remain unknown.

A practical lifecycle is:

Discover → Inventory → Classify → Test → Monitor → Govern → Retire

Discovery finds APIs. Inventory creates context. Classification identifies risk. Testing validates security. Monitoring provides runtime visibility. Governance manages identities and permissions. Retirement removes assets and access that are no longer required.

Continuous discovery is particularly important because API estates change as applications evolve, microservices expand, cloud environments shift and new integrations appear.

OWASP API9:2023 reinforces the need for accurate inventories of API hosts and versions, while modern discovery technologies increasingly use runtime and infrastructure visibility to identify APIs that existing documentation misses.

For the complete security framework around these assets, continue to the [Internal Link: API Security Guide].

Frequently Asked Questions

What is API discovery?

API discovery is the process of identifying APIs and endpoints across an organization’s environments and adding them to an inventory so they can be managed, tested, monitored and secured.

It should include both documented APIs and hidden, unknown or unmanaged endpoints. IBM similarly defines API discovery around finding documented and hidden APIs and compiling them into an inventory.

Why is API discovery important for security?

API discovery is important because security teams cannot consistently test, monitor or govern APIs they do not know exist.

Unknown or deprecated endpoints may operate without appropriate authentication, security testing or monitoring. OWASP API9:2023 specifically highlights the security problems created by poor inventories of API hosts and deployed versions.

What is an API inventory?

An API inventory is a maintained record of API assets and their relevant context.

A useful inventory can include endpoints, owners, environments, versions, authentication mechanisms, exposure, sensitive data, dependencies and lifecycle status. It should be updated as the deployed API environment changes.

What are shadow APIs?

Shadow APIs are APIs or endpoints that operate outside approved documentation or management processes.

They may be created through undocumented development, forgotten legacy systems, unregistered versions or APIs bypassing normal management controls. Google Cloud’s API Observation functionality is designed specifically to surface undocumented and unmanaged APIs.

How do automated API discovery tools work?

Automated discovery tools analyze sources such as runtime traffic, API gateways, cloud infrastructure, repositories and API specifications to identify active endpoints.

More advanced discovery processes can compare observed APIs against approved inventories to identify unknown or shadow assets. Google Cloud documents this model for its API Observation and Shadow API Discovery capabilities.

What is the difference between API discovery and API management?

API discovery focuses on finding APIs, including unknown and unmanaged assets. API management primarily focuses on publishing, controlling and operating known APIs.

Management platforms can contribute useful inventory data, but discovery remains important because APIs operating outside the management layer may otherwise remain invisible.