Information Security

API Security Policy

A api security policy template defining authentication, authorisation, rate limiting and lifecycle control for APIs, aligned to ISO 27001, NIST SP 800-53, PCI DSS, NIST CSF.

14-20 pages|Updated 2026-09-12|4 frameworks

What's Included

1. Purpose & Scope

Objective and the APIs covered.

Policy ObjectiveInternal and External APIsRoles and Responsibilities

2. Inventory & Ownership

You cannot secure an API you do not know about.

API RegisterOwnershipShadow API DiscoveryDeprecation Tracking

3. Authentication & Authorisation

Who may call an API and as whom.

Token StandardsScope and Least PrivilegeService AccountsKey Rotation

4. Input Validation & Output Control

Prevents the common API failure modes.

Schema ValidationInjection DefenceMass AssignmentData Minimisation in Responses

5. Rate Limiting & Abuse

Protects availability and cost.

Rate LimitsQuotasAnomaly DetectionThrottling Response

6. Transport & Logging

Protecting traffic and retaining evidence.

TLS RequirementsRequest LoggingSensitive Data Redaction

7. Lifecycle & Review

Versioning and retirement.

VersioningDeprecation NoticeRetirementAnnual Policy Review

Frequently Asked Questions

What should a api security policy include?

A comprehensive api security policy should include purpose & scope, inventory & ownership, authentication & authorisation, input validation & output control, and more. This template covers 7 key sections aligned to ISO 27001, NIST SP 800-53, PCI DSS, NIST CSF requirements.

Which frameworks require a information security policy?

Major frameworks requiring information security policies include ISO 27001, NIST SP 800-53, PCI DSS, NIST CSF. This template maps directly to their control requirements, making it easier to demonstrate compliance across multiple standards.

How often should a api security policy be reviewed?

Best practice is to review your api security policy at least annually, or whenever significant changes occur in your organisation, technology environment, or regulatory landscape. Most frameworks including ISO 27001 and NIST CSF require documented policy review cycles.

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