Scalar
Scalar is an open-source API platform built around the OpenAPI standard. It provides API documentation (API References), an offline-first API client, a centralized API registry for managing OpenAPI documents, JSON schemas and Spectral rules, and automated SDK generation for TypeScript, Python, Go, PHP, Java, and Ruby. Used by teams at SmartBear, Microsoft ASP.NET, and 30+ framework ecosystems including Express, FastAPI, NestJS, and Spring Boot. The platform has 14.9k GitHub stars and is MIT licensed. Scalar is backed by a strong open-source community and positions itself as the modern, open alternative to Swagger UI and Postman.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles Scalar the way a machine reads it — 80 machine-readable artifacts across 1 API, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Scalar scores 49.4/100 (developing), with a separate agent-readiness read of 29/100 (agent aware). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-08 · rubric v0.20.0
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How we profile Scalar
Each block below is one kind of artifact we hold for Scalar. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 38
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Scalar API References
Scalar API References renders modern, interactive API documentation from OpenAPI and Swagger specifications. Features include multiple themes, custom styling, dark mode, mobile ...
Scalar API Client
Scalar API Client is a fully open-source, offline-first REST API client built on the OpenAPI standard. Supports collections, environments, pre/post-response scripting, test resu...
Scalar Docs
Scalar Docs enables teams to create and publish developer documentation that stays in sync with their API and code. Supports writing with a WYSIWYG editor, pulling Markdown and ...
Scalar Registry
Scalar Registry provides centralized management and versioning of OpenAPI Documents, JSON Schemas, and Spectral Rules with deep Git integration. Serves as the single source of t...
Scalar SDKs
Scalar SDKs generates type-safe client libraries from OpenAPI specifications. Supported languages include TypeScript, Python, Golang, PHP, Java, and Ruby. Features include autom...
Scalar CLI
The Scalar CLI is a command-line interface for managing OpenAPI files, generating documentation, running mock servers, validating specs, and publishing to the Scalar Registry. E...
Scalar access-groups API
The access-groups API from Scalar — 5 operation(s) for access-groups.
Scalar analytics API
The analytics API from Scalar — 4 operation(s) for analytics.
Scalar api-docs API
The api-docs API from Scalar — 13 operation(s) for api-docs.
Scalar auth API
The auth API from Scalar — 27 operation(s) for auth.
Scalar docs API
The docs API from Scalar — 6 operation(s) for docs.
Scalar Docs Projects API
The Docs Projects API from Scalar — 9 operation(s) for docs projects.
Scalar Forgejo API
The Forgejo API from Scalar — 1 operation(s) for forgejo.
Scalar github API
The github API from Scalar — 16 operation(s) for github.
Scalar Internal API
The Internal API from Scalar — 1 operation(s) for internal.
Scalar login-portals API
The login-portals API from Scalar — 3 operation(s) for login-portals.
Scalar payment API
The payment API from Scalar — 6 operation(s) for payment.
Scalar publish API
The publish API from Scalar — 11 operation(s) for publish.
Scalar pubsub API
The pubsub API from Scalar — 7 operation(s) for pubsub.
Scalar rules API
The rules API from Scalar — 6 operation(s) for rules.
Scalar schemas API
The schemas API from Scalar — 7 operation(s) for schemas.
Scalar sdks API
The sdks API from Scalar — 18 operation(s) for sdks.
Scalar share API
The share API from Scalar — 1 operation(s) for share.
Scalar signup API
The signup API from Scalar — 1 operation(s) for signup.
Scalar team API
The team API from Scalar — 36 operation(s) for team.
Scalar themes API
The themes API from Scalar — 4 operation(s) for themes.
Scalar utility API
The utility API from Scalar — 3 operation(s) for utility.
Scalar vcs API
The vcs API from Scalar — 6 operation(s) for vcs.
Scalar waitlist API
The waitlist API from Scalar — 1 operation(s) for waitlist.
Scalar workspace API
The workspace API from Scalar — 6 operation(s) for workspace.
Scalar API Reference
Open-source (MIT) renderer that turns an OpenAPI/Swagger or AsyncAPI document into an interactive API reference with a built-in request-testing panel and multi-language code sam...
Scalar API Client
Fully open-source, offline-first API client built on the OpenAPI standard - a Postman/Insomnia alternative for sending REST, GraphQL, and WebSocket requests, organizing collecti...
Scalar Docs Platform
Hosted developer-portal product that combines Markdown/MDX guides with generated API references, custom domains and subdomains, themes, versions, and two-way Git Sync from GitHu...
Scalar CLI
Open-source command-line tool (@scalar/cli) for validating and linting OpenAPI documents (Spectral rules), previewing references, and publishing/listing/ updating/deleting docum...
Scalar SDK Generation
Hosted SDK generation that produces type-safe client libraries from an OpenAPI document for TypeScript, Python, Go, Java, PHP, C#, and Ruby, kept in sync with the registry. Paid...
Scalar Agent and MCP
AI layer that lets developers chat with an API inside the docs and exposes hosted MCP (Model Context Protocol) servers generated from an OpenAPI document so agents can call the ...
Scalar Registry Management API
Publish / list / update / delete documents - performed via the Scalar CLI (modeled).
Scalar Registry Read API
Public retrieval of published OpenAPI documents (confirmed public surface).
Scroll within the panel for all 38 ·
Open Collections 26
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTIONCore access-groups API
OPEN COLLECTIONCore access-groups analytics API
OPEN COLLECTIONCore access-groups api-docs API
OPEN COLLECTIONCore access-groups auth API
OPEN COLLECTIONCore
OPEN COLLECTIONCore access-groups docs API
OPEN COLLECTIONCore access-groups Docs Projects API
OPEN COLLECTIONCore access-groups Forgejo API
OPEN COLLECTIONCore access-groups github API
OPEN COLLECTIONCore access-groups Internal API
OPEN COLLECTIONCore access-groups login-portals API
OPEN COLLECTIONCore access-groups payment API
OPEN COLLECTIONCore access-groups publish API
OPEN COLLECTIONCore access-groups pubsub API
OPEN COLLECTIONCore access-groups rules API
OPEN COLLECTIONCore access-groups schemas API
OPEN COLLECTIONCore access-groups sdks API
OPEN COLLECTIONCore access-groups share API
OPEN COLLECTIONCore access-groups signup API
OPEN COLLECTIONCore access-groups team API
OPEN COLLECTIONCore access-groups themes API
OPEN COLLECTIONCore access-groups utility API
OPEN COLLECTIONCore access-groups vcs API
OPEN COLLECTIONCore access-groups waitlist API
OPEN COLLECTIONCore access-groups workspace API
OPEN COLLECTIONScroll within the panel for all 26 ·
Pricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.
Published pricing tiers and plan structures.
Scalar Plans Pricing
PLANSRate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Scalar Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Scalar Finops
FINOPSSemantic Vocabularies 1
JSON-LD contexts give the data shared meaning across APIs. We profile them because semantics are what let a machine reconcile 'customer' here with 'customer' somewhere else.
JSON-LD contexts and semantic vocabularies used across these APIs.
Scalar Context
JSON-LDSpectral Rules 2
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
Scalar API Rules
SPECTRALScalar API Rules
SPECTRALJSON Schema 1
Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.
Standalone JSON Schema definitions for this provider's data models.
Scalar OpenAPI Document Reference
JSON SCHEMAJSON Structure 1
JSON Structure captures the data shapes in a form built for tooling — a complement to JSON Schema that keeps the model machine-legible.
JSON Structure definitions describing this provider's data shapes.
Scalar Openapi Document Structure
JSON STRUCTUREExamples 3
Real request and response payloads are what turn a spec from abstract into obvious — and they're one of the twelve things an agent needs to call an API correctly on the first try.
Example request and response payloads for these APIs.
Security Posture 4
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Scalar — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Documentation 3
Reference material describing how the API behaves
Agent Surfaces 2
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 4
Pagination, idempotency, versioning, errors, and events
Build 3
SDKs, sample code, and the tooling you integrate with
Access & Security 4
Authentication, authorization, and security posture
Operate 3
Status, limits, changes, and where to get help
Commercial 1
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
Other 1
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/scalar · machine-readable index on apis.io
This is an independent, third-party profile of Scalar, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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