Best 40 API Design Tools in 2026

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Agenta is an open-source LLMOps platform for building reliable AI apps. Manage prompts, run evaluations, and debug traces with your team.

With over 4 million developers and 40,000 APIs, RapidAPI makes it easy to find, test, and connect to APIs. The unified platform provides a single dashboard to manage all your APIs.

Runware delivers the lowest-cost API for developers to run AI models. Get fast, flexible access to image, video, and custom generative AI tools with maximum efficiency.

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2025.09.07

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Speech To Video AI Generator

Speech to Video AI Generator

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2025.08.29

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Wan2.2 S2v AI S2vai Speech To Video Generator

Introducing Wan2.2 S2V AI — the revolutionary speech-to-video (S2V) and audio-to-video AI model that redefines professional content creation

MuAPI: The advanced AI Image/Video API Platform that empowers developers to seamlessly integrate cutting-edge visual AI capabilities into their applications with reliable, scalable solutions.

Context Engineering is an advanced AI system design platform that teaches professionals how to build dynamic systems providing AI with the right information, tools, and structure at the right time for optimal performance.

HateHoundAPI: Your Lightning-Fast, Free AI Solution for Toxic Comment Detection. Instantly identify harmful content with our powerful, easy-to-use API that keeps your community safe.

GraphDev: The complete modern toolkit designed for seamless GraphQL development, empowering developers with advanced tools and streamlined workflows for efficient API creation.

ReAPI revolutionizes API development with AI-powered tools for testing, documentation, and workflow optimization. Build, test, and document APIs faster than ever with ReAPI's intelligent automation.

NextCaptcha is an affordable online captcha solving service that efficiently handles reCAPTCHA challenges. NextCaptcha provides fast, reliable captcha resolution at competitive prices for users.

Collection of Generative AI tools for chat, coding, image and music creation.

Mochii AI is an all-in-one assistant with GPT-4o, Claude 3.7 & Gemini 2.0. Build custom AI chatbots and boost productivity with its free browser extension.

Create content, code, images, voiceovers & more - faster. OmniAI goes beyond Jasper with multimodal AI built for founders, freelancers & teams.

xBlog AI is the ultimate solution for ranking higher on Google, driving massive website traffic, and boosting sales effortlessly.

Roost AI's RoostGPT leverages advanced generative AI and leading LLMs including GPT-4, Gemini, Claude, and Llama3 to automatically generate comprehensive test cases, delivering 100% enhanced test coverage.

Treblle empowers engineering and product teams to effortlessly build, ship, and master their REST APIs. With Treblle's comprehensive observability and API intelligence, teams gain deep insights through one intuitive platform.

Perform in-depth security testing and scan your iOS and Android app's code to prevent vulnerabilities and safeguard your users.

Create powerful voice AI agents effortlessly with Vapi - the ultimate platform for developers. Build, test, and deploy conversational AI in minutes using Vapi's advanced tools and seamless integration.

Boost API development speed with Postman's comprehensive platform. Postman streamlines team collaboration and simplifies your entire API lifecycle for faster, superior outcomes. Discover more.

It’s an all-in-one SaaS platform to generate AI content

Leverage API Hub for enterprise-grade APIs and MCP servers, powering both traditional apps and AI agents with robust cloud infrastructure at predictable costs.

A core component of the AI-driven Application Security Platform, proactively helps developers and security teams detect, prioritize, and remediate vulnerabilities in code, APIs, and applications

Vexa delivers multilingual real-time transcription across all major meeting platforms. Seamlessly integrate meeting bots, streaming audio processing, and knowledge extraction through our powerful API.

API-based Infrastructure for human conversation deep analysis. Start Building ApplicationsThat Improve Ways We Collaborate.

Xturing, an innovative open-source AI personalization library, empowers developers to create customized AI experiences with efficiency and flexibility.

Generated by Text to API - a powerful solution for transforming text into API calls, built with create next app. Elevate your development workflow today.

Experience the power of Backendr: Generate Backend APIs with AI. Transform your ideas into robust backend systems instantly, saving development time and resources while ensuring scalability and security.

Backmesh: The Open Source BaaS powering your AI applications with seamless backend infrastructure.

Introducing Next Boiler Plate: Build your AI startup with everything you need—templates, backend, and custom components.

GovernanceAI: Detect and resolve critical API design and implementation issues with our AI-powered solution, leveraging the industry-leading API Governance Top-10™ List for comprehensive protection.

API2D works with any software, website, or SDK that uses OpenAI's interface and supports custom API domains. After logging in, visit the "Compatible Apps" page in the left menu to find tutorials for dozens of applications that work seamlessly with API2D.

Extract data from any website in seconds Download instantly, scrape at scale in the cloud, or create API workflows

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2025.01.22

What is API Design

API Design is the process of creating clear, user-friendly interfaces that allow different software systems to communicate. It focuses on defining how applications interact, including request/response formats, data structures, and authentication methods. Good API design ensures ease of use, scalability, and security.

API Design Appication Scenario

E-commerce Platform

Design RESTful APIs for product catalog, user authentication, and order processing, enabling seamless integration with mobile apps and web clients

Payment Gateway

Create secure API endpoints for payment processing, transaction verification, and refund handling across multiple financial service providers

Social Media Integration

Develop APIs for content sharing, user interaction, and data synchronization between different social platforms and third-party applications

API Design Core Features

RESTful Endpoints

Design clean URL hierarchies and HTTP methods (GET/POST/PUT/DELETE) for intuitive resource access and manipulation

Authentication

Implement JWT tokens, OAuth2 or API keys to secure endpoints and manage user access permissions

Versioning

Maintain backward compatibility through URI versioning (v1/v2) or header-based version control

Rate Limiting

Control API usage with throttling mechanisms to prevent abuse and ensure fair resource allocation

What is the top 10 AI tools for API Design?

Name	Compatibility	Integration	Subscription Types
Xblog AI	All devices	Wordpress, Wix, Shopify and more...	Starter $29 /month Pro $49 /month Enterprise $149 /month
Dinuai	Web Based Windows Mobile	Google Word Gmail MailChimp Twitter Excel	Free Pro - $1.99 /month Plus - $23 /month Business - $89 /month
My AI Tools	This is a web application and it is compatible with all type of devices - mobile phones, tablets, laptops, etc.	Integrates with Stripe for payments.	You received 4 credits for free and unlimited credits for $18 per month
Appcan	Web	None.	$18/Month
Venice	Mobile Web, Desktop Web, all Web Enabled devices	Unlimited integrations via Venice API	$18 Per month or $149 per Year
Omniai.club	OmniAI is fully compatible across web and mobile platforms, offering a seamless experience for small business owners and professionals on the go.	OmniAI integrates with leading AI models and supports workflow automation tools to streamline content creation, task management, and learning personalization.	OmniAI’s starter plan begins at $75/month, which includes access to the Growth Assistant. Users can unlock a $20 discount on any plan using the code NFHQHZHP.
Mochii AI	- Web-based platform	No	Personal Free Pro $4.99/per month Premium $9.99/per month Ultimate $29.99/per month
Graphdev	- Web-based platform	None	<a href="https://trygraphdev.com?utm_source=LionAIBox" target="_blank" rel="nofollow">- Visit the official website for more details.</a>
Wan2.2 S2v AI S2vai Speech To Video Generator	Introducing Wan2.2 S2V AI — the revolutionary speech-to-video (S2V) and audio-to-video AI model that redefines professional content creation	Introducing Wan2.2 S2V AI — the revolutionary speech-to-video (S2V) and audio-to-video AI model that redefines professional content creation	Introducing Wan2.2 S2V AI — the revolutionary speech-to-video (S2V) and audio-to-video AI model that redefines professional content creation
Reapi	- Web-based platform	- API	<a href="https://www.reapi.com?utm_source=LionAIBox" target="_blank" rel="nofollow">- Visit the official website for more details.</a>

FAQs for API Design

What is RESTful API design?

RESTful API is an architectural style that uses HTTP methods (GET, POST, PUT, DELETE) to interact with resources through standardized endpoints, following stateless communication principles and supporting CRUD operations.

How to handle API versioning?

Common versioning strategies include URI versioning (v1/api/users), header versioning (Accept: application/vnd.company.v1+json), or query parameter versioning (?version=1.0), ensuring backward compatibility.

What status codes should APIs return?

Use standard HTTP status codes: 200 for success, 201 for creation, 400 for bad requests, 401 for unauthorized, 404 for not found, 500 for server errors. This ensures clear communication of request outcomes.

How to secure API endpoints?

Implement authentication (OAuth, JWT), use HTTPS, rate limiting, input validation, and API keys. Regular security audits and keeping dependencies updated are also essential practices.

What is API rate limiting?

Rate limiting restricts the number of API requests a client can make within a specified time period, preventing abuse and ensuring fair resource usage. Usually implemented through tokens or request counting.

How to handle API documentation?

Use tools like Swagger/OpenAPI for automated documentation, include clear examples, endpoint descriptions, request/response formats, and authentication requirements. Keep documentation updated with API changes.

What is API pagination?

Pagination divides large data sets into smaller chunks, usually implemented through limit/offset or cursor-based approaches, helping manage server load and improve response times.

How to handle API errors?

Return consistent error formats with appropriate status codes, error messages, and error codes. Include helpful debug information in development but limit sensitive details in production.

What is API caching?

Caching stores API responses temporarily to reduce server load and improve response times. Implement using HTTP cache headers, Redis, or other caching mechanisms with appropriate invalidation strategies.

How to ensure API performance?

Optimize database queries, implement caching, use compression, minimize payload size, employ connection pooling, and regularly monitor performance metrics. Consider using CDNs for global distribution.