APIs are increasingly becoming new business assets for organizations and consequently, API functionality and its pricing should be precisely defined for customers. Pricing is typically composed by different plans that specify a range of limitations, e.g., a Free plan allows 100 monthly requests while a Gold plan has 10 000 requests per month. In this context, the OpenAPI Specification (OAS) has emerged to model the functional part of an API, becoming a de facto industry standard and boosting a rich ecosystem of vendor-neutral tools to assist API providers and consumers. In contrast, there is no proposal for modeling API pricings (i.e., their plans and limitations) and this lack hinders the creation of tools that can leverage this information. To deal with this gap, this paper presents a pricing modeling framework that includes: (a) Pricing4APIs model, a comprehensive and rigorous model of API pricings, along SLA4OAI, a serialization that extends OAS; (b) an operation to validate the description of API pricings, with a toolset (sla4oai-analyzer) that has been developed to automate this operation. Additionally, we analyzed 268 real-world APIs to assess the expressiveness of our proposal and created a representative dataset of 54 pricing models to validate our framework.

Rafael Fresno-Aranda

Pablo Fernandez

Antonio Gamez-Diaz

Amador Duran

Antonio Ruiz-Cortes

Computer Standards & Interfaces

The quality of software, well-defined interfaces (hardware and software), the process of digitalisation, and accepted standards in these fields are essential for building and exploiting complex computing, communication, multimedia and measuring systems. Standards can simplify the design and construction of individual hardware and software components and help to ensure satisfactory interworking.

Computer Standards & Interfaces is an international journal dealing specifically with these topics.

The journal
• Provides information about activities and progress on the definition of computer standards, software quality, interfaces and methods, at national, European and international levels
• Publishes critical comments on standards and standards activities
• Disseminates user's experiences and case studies in the application and exploitation of established or emerging standards, interfaces and methods
• Offers a forum for discussion on actual projects, standards, interfaces and methods by recognised experts
• Stimulates relevant research by providing a specialised refereed medium.

The journal "Computer Standards and Interfaces" focuses on software quality, the definition of hardware and software interfaces, the process of digitalization, and accepted standards in these fields. These standards are essential for building and exploiting complex computing, communication, multimedia, and measurement systems. Standards can simplify the design and construction of individual hardware and software components and help ensure satisfactory interoperability.

The journal includes the following key aspects:
• Provides information about activities and progress on the definition of computer standards, software quality, interfaces, and methods at national, European, and international levels;
• Publishes critical comments on standards and standards activities;
• Disseminates user experiences and case studies in the application and exploitation of established or emerging standards, interfaces, and methods;
• Offers a forum for discussion on actual projects, standards, interfaces, and methods by recognized experts;
• Stimulates relevant research by providing a specialized refereed medium.

《Computer Standards and Interfaces》期刊专注于软件质量、硬件和软件接口的定义、数字化过程以及这些领域内的公认标准。这些标准对于构建和利用复杂的计算、通信、多媒体和测量系统至关重要。标准可以简化单个硬件和软件组件的设计与构建，并帮助确保良好的互操作性。

本期刊的主要内容包括：
• 提供关于计算机标准、软件质量、接口和方法在国家、欧洲及国际层面上定义的活动和进展的信息；
• 发表对标准及其活动的批评性评论；
• 传播用户在应用和利用已建立或新兴标准、接口和方法方面的经验和案例研究；
• 为公认专家讨论实际项目、标准、接口和方法提供论坛；
• 通过提供一个专业的审稿平台，刺激相关研究的发展。

Category	Quartile
计算机科学	2
计算机科学, 计算机硬件	2
计算机科学, 计算机软件工程	2

Pricing4APIs: A rigorous model for RESTful API pricings

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Journal Info

Category	Quartile
COMPUTER SCIENCE, SOFTWARE ENGINEERING	1