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What is AsyncAPI?

AsyncAPI is an initiative driven by the community that seeks to improve the realm of Event-Driven Architecture (EDA). Our objective is to make engaging with EDAs as straightforward as working with REST APIs. This mission encompasses multiple facets, such as documentation, event management, code generation, and event discovery, among others. The AsyncAPI Specification provides a standardized, protocol-agnostic framework that defines message-based or event-driven APIs. By leveraging the AsyncAPI document, users—both human and machine—can understand the capabilities of an event-driven API without the need to sift through source code, access extensive documentation, or monitor network traffic. This specification facilitates the creation of API structures and formats, detailing the channels that users can subscribe to and the message formats they will receive. Additionally, users are empowered to create, validate, and update their AsyncAPI documents to align with the latest version or to view them in a more user-friendly format using the AsyncAPI Studio, which enhances the overall experience and accessibility. Ultimately, our goal is to promote a more unified and efficient approach to event-driven interactions, ensuring that developers can focus more on building rather than grappling with complexity. We believe that by streamlining these processes, we can contribute significantly to the evolution of event-driven systems.

What is 21st?

21st is a developer-focused platform designed to simplify the creation and deployment of AI agents within modern software applications. The platform provides an SDK that allows developers to define agents using simple code while integrating tools, prompts, and AI models. It supports multiple development environments and frameworks including Next.js, React, TypeScript, Python, Node.js, and other common programming stacks. Developers can configure agents to run on advanced runtimes such as Claude Code or Codex, enabling tool usage, file access, and intelligent task execution. Once the agent configuration is defined, deployment can be completed using a single command that automatically sets up infrastructure. The platform manages backend systems such as sandboxed execution environments, authentication, rate limits, and streaming responses. It also includes a drop-in chat interface component that developers can embed directly into their applications to enable user interaction with agents. Real-time token streaming allows users to see responses generated progressively, creating a more interactive experience. The platform provides built-in observability tools that allow developers to monitor conversations, replay sessions, and trace agent actions. These features make debugging and optimization much easier during development and production. 21st also includes usage controls such as per-user spending limits, quotas, and metering to help manage AI costs. By combining powerful developer tools with managed infrastructure and deployment capabilities, 21st makes it easier for teams to build and scale AI-powered agents within their products.

Media

Media

Integrations Supported

C#
JSON
Java
React
Specmatic
Tailwind CSS
TypeScript
YAML
shadcn/ui

Integrations Supported

C#
JSON
Java
React
Specmatic
Tailwind CSS
TypeScript
YAML
shadcn/ui

API Availability

Has API

API Availability

Has API

Pricing Information

Pricing not provided.
Free Trial Offered?
Free Version

Pricing Information

Free
Free Trial Offered?
Free Version

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

AsyncAPI

Date Founded

2019

Company Location

Spain

Company Website

www.asyncapi.com

Company Facts

Organization Name

21st.dev

Company Website

21st.dev/

Categories and Features

API Management

API Design
API Lifecycle Management
Access Control
Analytics
Dashboard
Developer Portal
Testing Management
Threat Protection
Traffic Control
Version Control

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