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API interfaces built for developers and agents

Create beautiful docs, SDKs and secure MCP servers from your API. Scalar keeps every interface in sync as your API evolves.

import Profound from '@profoundai/client';

const client = new Profound({
  apiKey: process.env['PROFOUND_API_KEY'], // defaults to the PROFOUND_API_KEY env var
  environment: 'production',
});

const category = await client.organizations.categories.list();

console.log(category);
Zoom API documentation preview Zoom API documentation preview
Clerk API documentation preview Clerk API documentation preview
import WarpAPI from "warp-hr";

const client = new WarpAPI({
  apiKey: process.env["WARP_API_KEY"], // defaults to the WARP_API_KEY env var
});

// Auto-paginating: the next cursor page is fetched as you iterate.
for await (const assignment of client.timeOff.listAssignments({ limit: 50 })) {
  console.log(assignment.id, assignment.policy.name);
}

Take their word for it

“After years of helping enterprises implement API strategies at SmartBear, I can confidently say Scalar is what the industry has been waiting for.

The strict OpenAPI compliance, robust CLI/API registry, and seamless CI/CD integration solve the exact pain points I watched customers struggle with daily. This is the modern API platform developers deserve.”

Michael, Former Solutions Architect @ Smartbear

“One of my most recent favorites is a in-browser ad hoc testing UI called Scalar.

One of the things that I really love about Scalar, it's got this modern UI experience, and it provides built-in test generation code for a variety of targets, from cURL to HttpClient in C#.”

Captain Safia, Engineer @ Microsoft ASP.NET

“Scalar's ‘golden ticket’ is… Scalar!

They are (in my own words) building a product ecosystem for API design, docs, testing, and governance – with offerings at every price point.

They are open source. So I can get in on free features and stay with Scalar no matter how big my API needs blow up.”

Eron, Documentation Engineer @ Qrvey

Docs

The Modern Documentation Platform for Your API and Everything Else

Write documentation with Markdown and MDX, generate API references from OpenAPI and AsyncAPI, and keep everything up to date with two-way Git sync.

Markdown and MDX OpenAPI + AsyncAPI Two-Way Git Sync Custom HTML/CSS/JS Chat with AI/MCP Private or Public
Docs Docs
Scalar embraces open standards and makes it easy for you to embrace them too. Join the open-source community and start building on open foundations. Developer Portals WWW.SCALAR.COM
Scalar SDK Generation

One Commit To Update All Your SDKs

Bring your OpenAPI document and get type-safe client libraries for TypeScript, Python, Golang, PHP, Java and Ruby with more languages coming soon.

OpenAPI-First Custom-code Code Samples OpenAPI Authentication Syncs with Docs File Streaming Support
SDKs SDKs
SDKs SCALAR.COM SOFTWARE • DEVELOPMENT • KITS
MCP & Agent

Turn Your OpenAPI Documents Into an MCP Server

Upload your OpenAPI documents and expose them as a hosted MCP server: just-in-time tool calls, secure delegated auth, and only 0.2% of your context window no matter how many APIs you connect.

Just-in-time tool calls Secure delegated auth Scoped access Isolated execution Markdown in MCP Public and internal APIs
Claude connected to a Scalar MCP server Claude connected to a Scalar MCP server
SCALAR.COM AT YOUR SERVICE Agent Scalar ©


Marc from Scalar here,


There's no better feeling than building and being enabled by the software you are integrating with.


We've all experienced friction with out-of-date docs, no client SDKs in your favorite language, and no one to talk to about your struggles on-boarding.


But we've also experienced those magical APIs that just work with everything you need right there. This drives our simple three tenants at Scalar: Accessibility, Open-Source, and API First. Making on-boarding easier and magical enables people to build, and being API first means your business can scale for the future (LLMs).


Why Open-Source? If done right, it’s transparent, builds industry standards (OpenAPI), accelerates innovation, and fosters collaboration. We love Open-Source and keep it core to our values.


We are fans of “show don't tell here” at Scalar: so try our Docs (this page), our SDKs for our API that includes our API Client, Agent to chat with APIs, and our GitHub for all our open-source products. As always, we love your feedback so drop us a line in our discord, email, or book a call with me to see how we can help.



Marc Laventure
CEO, Scalar
L O V E S

What are you waiting for?

We're committed to enabling developers and companies to practice the highest of API industry standards.

Community → GitHub → Contact Us →
API Docs Preview API Docs Preview
API Docs
Write beautiful documentation with Markdown, MDX, OpenAPI, AsyncAPI, and two-way Git sync.
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SDKs Preview SDKs Preview
SDKs
Bring your OpenAPI document and get type-safe client libraries for TypeScript, Python and more.
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API Registry Preview API Registry Preview
API Registry
Managing & versioning OpenAPI Documents with a deep Git integration.
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MCP & Agent Preview MCP & Agent Preview
MCP & Agent
OpenAPI-backed MCP servers and SDKs that connect your APIs to LLMs with just-in-time tools and delegated authentication.
Learn More