What is API Monitoring? Everything You Need to Know

What is API Monitoring? Everything You Need to Know


Application Programming Interfaces (APIs) are the glue powering SaaS application connectivity. However, ensuring smooth operation of APIs requires more than just implementation; vigilant oversight and alerting can make or break your API products.

Welcome to the realm of API monitoring, where the data transferred during digital interactions is meticulously measured and cataloged. From optimizing product and user performance to safeguarding against potential pitfalls or misuse, API monitoring empowers API-first organizations to deliver reliable, scalable, and high-performing digital experiences. We’ve written extensively about the costs associated with building internal API monitoring solutions and will be focusing on external integrations for this post.

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What is API monitoring?

API monitoring is the practice of constantly observing and analyzing the performance, availability, and functionality of your APIs. API monitoring involves tracking key metrics - which can vary depending on your API product- such as response times, error rates or status codes, and overall health, ensuring that APIs operate as intended and without interruption. By continuously monitoring APIs in real-time, organizations can proactively take charge of their product health, identify issues, and take prompt corrective action. A proactive approach helps maintain the reliability, efficiency, and security of the interconnected digital systems that rely on APIs, not just internally but externally for your customers, as well. Ultimately, keeping track of your API health will contribute heavily to a positive user experience. Happy users equal lower churn, keeping your APIs in use and valuable to external ecosystems. API monitoring is a crucial aspect of modern IoT management, as a seamless operation of interconnected applications is the best way to retain market value.

Monitoring plays a pivotal role in addressing essential questions for internal developer teams: Are your API products accessible? How do they perform? Are the APIs operating as intended? The failure of APIs translates directly into application failures, which can cause your paying customers to lose faith in your abilities as an API provider. In the context of digital transformation initiatives, APIs are fundamental components propelling organizations into the contemporary digital era, but only if they perform. As a result of the interconnected nature of technological stacks, a majority of applications rely on APIs for critical business transactions. However, without a truly comprehensive understanding of the inner workings of each API endpoint or the sequence and contents of API calls, organizations introduce blind spots in their performance evaluations.

In scenarios where APIs that are critical to the functioning of your (or your user’s) application face issues such as unavailability, malfunctioning, or unresponsiveness, the repercussions extend to the overall performance of your application, adversely affecting the end-user experience and introducing reasons for your paying customers to consider alternatives.

How does API monitoring work

API monitoring operates by giving developers the tools needed to ensure functionality and performance of APIs. API monitoring can be done manually, but it is unreasonable to expect that manual monitoring is a scalable solution. As such, an API monitoring tool or platform is the best solution, as these programs do not require consistent human oversight, but rather work automatically.

These API monitoring tools can automatically check API performance and availability at specified intervals of time to ensure that your APIs run appropriately. The specific timing of those intervals is unique to your API product.

  1. Endpoint Surveillance:
  • API monitoring begins by closely tracking the various endpoints of an API system. These endpoints represent specific functionalities or resources that the API provides.
  1. Request-Response Analysis:
  • Monitoring tools can simulate API requests by sending predefined inputs and parameters to specific endpoints, then analyzing the responses for relevant factors such as response time or data accuracy.
  1. Performance Metrics Measurement:
  • Key performance metrics, such as response time, latency, and error rates, are continuously measured. These metrics offer insights into the overall health and efficiency of an API.
  1. Error Detection and Logging:
  • Actively identify and log any errors or anomalies in API responses with an API monitoring program. This includes capturing HTTP error codes, unexpected data/file formats, and alerting of any deviations from expected behavior.
  1. Security Checks:
  • Assess your API transactions for unauthorized access attempts, potential vulnerabilities, and adherence to security protocols.
  1. Alerting and Notification System:
  • Automated alerting systems can be configured with high levels of customization to notify relevant stakeholders when predefined thresholds are exceeded or when abnormal behavior is detected.
  1. Usage Analytics Gathering:
  • Collect usage analytics for insights into how a given API is being utilized. This data helps software organizations plan for scalability, optimize resource allocation, and understand user behavior.
  1. Logging for Auditing:
  • Detailed logs of API interactions are maintained for auditing purposes. These API logs are valuable resources for post-incident analysis and tracking historical performance and behavioral trends.
  1. Continuous Monitoring:
  • API monitoring is a constantly ongoing, real-time process. It ensures that issues of any scope are identified and addressed promptly.

Importance of API monitoring

API monitoring has the ability to ensure the consistent availability, optimal performance, and secure functionality of your API products, keeping your customers happy and your product running smoothly. By continuously, automatically tracking key metrics (such as response times, error rates, and security vulnerabilities), organizations can take a proactive approach to identify and address issues before they impact end-users, instilling confidence in your paying customers that your product works. The specific metrics that are valuable to your API product will depend on your offering, your use cases, and your real user data, but a good API monitoring program will allow you to capture any main metric. With a proactive approach to safeguarding the reliability of your technological services, API monitoring contributes heavily to a positive user experience. API monitoring should not merely be a reactive measure; it can serve as a guiding tool for maintaining business continuity.

What are the primary use cases for API monitoring?

API monitoring serves various crucial use cases in ensuring the reliability, performance, and security of APIs. From availability monitoring to usage analytics, API monitoring can be relevant to technical and non-technical teams. Some of the most broad use cases for API monitoring that are relevant to any SaaS team include:

Performance Optimization:

  • Track key performance metrics to identify bottlenecks in onboarding or API usage and optimize the overall efficiency of API interactions.

Usage Analytics and User Analysis:

  • Gather insights into how APIs are being utilized, including usage patterns, popular endpoints, and user behaviors. This information aids in capacity planning and resource optimization but also shapes Developer Relations and Customer Success workflows.

Compliance Adherence and Security Monitoring:

  • Monitor APIs to ensure they comply with industry standards and regulations regarding data security and privacy, reducing the risk of legal and regulatory complications. Understanding your API’s security and threat potential of unauthorized use or abuse keeps your API and user data safe.Running security checks from development to production means front and backend analysis.

There are of course more technical reasons to monitor your API usage, such as error detection or log analysis, but the above use cases were selected to exemplify the wide range of developer and non-developer users alike who can benefit from becoming acquainted with their organization’s API monitoring tools.

Factors to consider when choosing an API monitoring tool

Selecting the right API monitoring tool for your API product(s) requires careful consideration of several factors to ensure it aligns with your specific use case.

Usability: When selecting an API monitoring tool, always prioritize usability. Select a tool with an intuitive and easy-to-use interface. Ideally, your selected monitoring tool allows for customizable reports and a streamlined setup process, but the setup being simple is more of a financially driven choice rather than strictly matching the tool to your APIs. Real-time alerts are invaluable, as nobody, not even your most nocturnal engineers, should be on call for 404s. A good monitoring tool offers instant notifications via channels like email, Slack, or SMS for timely actions.

Integrations: Seamless operations and effective error detection rely on robust integrations. Choose a tool with strong integration capabilities that match the frameworks you currently already use. Additionally, a RESTful API enables automation and integration into existing workflows, making REST APIs a natural fit for external API monitoring tools.

Value Metrics: Metrics play a vital role in evaluating API performance, but not every metric is important or relevant to your API product. Selecting an API monitoring tool that allows you to customize your monitoring to surface your most valuable metrics is huge. If you’re not sure what matters to your API, check out our blog post on Vanity vs Value metrics for API products. By focusing on the analytics that matter to your product, your management solution can facilitate real-time data collection and visualization, supporting data-driven decisions, and enhance your overall API performance.

Resources: Support and documentation is a crucial aspect of a smooth monitoring experience. Look for tools offering well-documented instructions for setup and troubleshooting. Some tools offer additional training resources, such as webinars or tutorials, to enhance users’ understanding of features and capabilities. Making sure that the management solution you select has a viable developer portal can save you from future headaches and blocks.

Best API monitoring tools

Find the right monitoring fit for your API analytics use case.


Moesif takes a user-centric approach to API observability and monitoring. It tracks how organizations interact with your APIs and applications down to the individual user seat. In case of any alert, you can count on real-time alerting, capable of integrating with any messaging platform. Alerts are validated, at which point Moesif uses your custom settings to filter alerts that are not relevant and surface important notices. Moesif supports any kind of product surfaced to a user base, not strictly API ones. With its comprehensive monitoring solutions, Moesif ensures issue resolution and provides “Full Stack Visibility” for generating valuable insights. Moesif’s PAYG monetization model lends flexibility, making it a natural choice for small and growing enterprises as well as ones who are already at scale.


Datadog’s proactive API monitoring platform automates your technical system health, reducing identification time for issues.Datadog compares application performance internally and externally, with an emphasis on efficient time management through maintenance and test automation tools. Datadog is, at its core, a highly versatile and comprehensive monitoring and analytics platform that is particularly good for enterprise level organizations with multi-stack applications.


Postman’s platform gives you the power you to monitor a broad range of API products on any kind of framework. From REST through GraphQL, Postman is a versatile and user-friendly tool. Postman allows users to monitor and test APIs in a collaborative but organized manner. Its user-friendly, intuitive interface allows users to create and execute automated scripts, ensuring the reliability and performance of API products. Whether you are a developer, tester, or a member of a cross-functional team like developer relations, Postman can streamline the API monitoring process.


With RapidAPI, users gain access to a vast marketplace of APIs, enabling monitoring of various services and tools from a single interface. Its extensive API catalog facilitates easy integration and testing, allowing users to monitor diverse endpoints effortlessly. RapidAPI’s user-friendly dashboard simplifies the monitoring and testing processes, making it accessible to both developers and non-technical users. By leveraging RapidAPI for API monitoring, organizations can optimize their workflows.


Sematext is an ideal choice for API monitoring, with a robust suite of tools for real-time insights and proactive issue resolution. It boasts a simple interface and customizable dashboards, Sematext enables easy visualization and analysis of key metrics. Its emphasis on anomaly detection and alerting ensures quick response to deviations, while support for distributed tracing provides detailed transaction views for optimization. Scalable and cloud-native, Sematext caters to the monitoring needs of businesses, making it a powerful tool for ensuring the reliability and performance of APIs in the digital landscape.

API monitoring best practices

  1. Define Clear Objectives: Define specific objectives and key performance indicators aligned with business goals, and update these objectives as business goals change.

  2. Regular Endpoint Monitoring: Monitor API endpoints regularly for availability and expected functionality.

  3. Key Performance Metrics: Track metrics like response time, latency, throughput, and error rates for insights into API health. Find the metrics that matter to your API product and build your monitoring framework around them.

  4. Real-Time Monitoring: Implement real-time monitoring for quick issue detection and response to take a proactive approach to you API health.

  5. Security Monitoring: Monitor for unauthorized access, data breaches, and adherence to security protocols as well as test your architecture regularly.

  6. Scalability Planning: Assess API usage patterns to plan for scalability and handle increased traffic loads.

  7. User Experience Focus: Consider metrics impacting user experience, such as page load times or transaction success rates.

  8. Dependency Tracking: Monitor dependencies between APIs to address issues from interconnected systems.

  9. Logging and Auditing: Maintain detailed logs for auditing, compliance, and post-incident analysis.

  10. Integration with DevOps: Integrate API monitoring into DevOps processes for continuous testing and early issue detection.

Why use Moesif for API monitoring?

Moesif is a standout choice for API monitoring thanks to its comprehensive and user-driven approach. Offering unparalleled visibility into API transactions and user actions, Moesif goes beyond conventional monitoring tools by providing detailed analytics on user behavior, and how it impacts performance metrics. Moesif’s ability to generate insights from behavioral analytics adds another layer of sophistication, allowing for the analysis of user journeys for fine tuning of onboarding, marketing, customer success, and beyond. It excels in error detection and troubleshooting, providing in-depth information on errors and status codes. With its robust features and emphasis on comprehensive analytics, Moesif is a powerful tool for organizations in need of informed API management.


In summary, API monitoring ensures the reliability, performance, and security of API products and the interconnected systems they support. Beyond its role in swiftly addressing issues, API monitoring is key for delivering stellar user experiences and maintaining organizational agility for scaling growth.

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