In today's agile world, speed is often celebrated. Teams aim to release features quickly and respond to customer needs faster than competitors. However, in the pursuit of rapid delivery, one critical area is often neglected: API security.
When ignored, API security becomes a form of technical debt that silently grows over time and eventually costs far more to address than it would have if built correctly from the start.
What Is Technical Debt?
Technical debt refers to the future cost of choosing quick, convenient solutions instead of building them correctly at the beginning.
Teams take on technical debt when they prioritize speed, simplicity, or deadlines over maintainability, scalability, and security. This debt is not always bad. It can help deliver value faster, but it must be managed carefully.
If left unattended, technical debt leads to instability, inefficiency, and higher long-term costs.
Why Technical Debt Happens
Technical debt usually builds up for predictable reasons. Some are structural, while others are cultural or process-driven:
1. Rushed delivery Tight deadlines encourage teams to focus on short-term goals. Security and documentation are postponed for "later."
2. Unclear ownership Security is often seen as someone else's responsibility. Developers focus on features, operations on uptime, and security teams often come in only after release.
3. Lack of visibility and tooling Without complete visibility, organizations do not always realize how much risk has accumulated. This is especially true in distributed environments.
4. Legacy and evolving systems Older services and APIs are frequently left behind without proper maintenance or modern security practices.
The Real Cost of Technical Debt
Ignoring technical debt creates a cycle that slows innovation and increases operational costs. Teams spend more time fixing problems than building new capabilities.
For example, the IBM Cost of a Data Breach Report 2024 found that breaches involving APIs cost about 25 percent more than the average security incident. This happens because API vulnerabilities often remain hidden and are exploited for long periods before being detected. Here's how to find out the true cost of a breach.
In financial terms, technical debt is like an unpaid loan that grows over time. In engineering terms, it becomes an obstacle to agility and trust.
API Security: The Unseen Technical Debt
APIs are the backbone of modern applications. They connect systems, enable integrations, and expose valuable data. Yet API security is often overlooked or underfunded.
Many organizations:
- Deploy APIs without proper documentation or inventory
- Rely only on traditional perimeter tools like WAFs
- Miss business logic vulnerabilities that standard scanners cannot detect
- Fail to monitor APIs continuously once deployed
The result is a growing set of invisible liabilities: shadow APIs, zombie endpoints, and misconfigurations that attackers can exploit. This is API security debt in action.
How to Make API Security Part of the SDLC
Teams can reduce or eliminate API security debt by integrating security into every stage of the software development lifecycle (SDLC).
1. Design
- Include API threat modelling and security reviews at the design stage.
- Require OpenAPI or Swagger documentation for all new APIs.
- Plan authentication and data protection from the start.
2. Development and Testing
- Integrate static and dynamic API testing into CI/CD pipelines.
- Validate access control, input validation, and business logic rules.
- Include automated security tests for common API weaknesses.
3. Deployment and Monitoring
- Continuously monitor API traffic for anomalies and suspicious behaviour.
- Detect shadow and zombie APIs in production environments.
- Set alerts for unusual data exposure or policy violations.
4. Governance and Compliance
- Maintain a complete and accurate API inventory.
- Enforce consistent security policies across all environments.
- Align with compliance frameworks such as GDPR and DDPI.
When API security becomes part of daily engineering practice, it shifts from being a backlog item to being a core quality standard.
How Rakuten SixthSense Helps Reduce API Security Debt
Rakuten SixthSense API Security provides end-to-end visibility and protection for APIs. It helps organizations discover, monitor, and secure every API across their environments without disrupting development speed.
Key strengths:
- Comprehensive discovery: Identifies all active, shadow, and zombie APIs across cloud and on-prem environments.
- Real-time monitoring: Analyzes live traffic to detect vulnerabilities, data leaks, and anomalies.
- AI-based analysis: Detects complex business logic flaws that traditional scanners miss.
- Flexible deployment: Works in SaaS, on-premises, or air-gapped environments.
- Fast proof of concept: Deployed in less than four hours and covers up to one million API calls.
SixthSense enables teams to build security into their workflows and proactively reduce risk. The result is a cleaner, more resilient API ecosystem with lower long-term costs.
Conclusion
Technical debt is a natural part of building software, but API security debt is avoidable. Every undocumented endpoint, weak access control, or unmonitored API increases long-term risk.
The most effective way to prevent this is to integrate security early, automate visibility, and make API protection a continuous process.
Rakuten SixthSense helps teams achieve this by providing full API visibility, intelligent threat detection, and flexible deployment models that fit modern development workflows.
Start your free SixthSense API Security Proof of Concept today and secure your first one million API calls within minutes.