Playground API — Free Stateful Mock REST & GraphQL Service

A free, zero-configuration, stateful mock REST and GraphQL API sandbox by Nilesh Kumar / Niles Labs. Unlike static mock APIs, it provides stateful per-session virtual mutation overlays where POST/PUT/PATCH/DELETE mutations persist across GET queries within a session, while the global baseline dataset remains read-only. Includes chaos/network simulation, dynamic collections, avatar/thumbnail generators, and simulated JWT auth loops. MIT licensed, no auth or signup required.

Playground API — Free Stateful Mock REST & GraphQL Service publishes 10 API contracts indexed on the APIs.io network, including Auth API, Avatars API, Comments API, and 7 more. Tagged areas include Developer Tools, Testing, Mock API, api-sandbox, and REST.

The Playground API — Free Stateful Mock REST & GraphQL Service catalog on APIs.io includes 1 Spectral governance ruleset.

Playground API — Free Stateful Mock REST & GraphQL Service’s developer surface includes engineering blog, getting-started guide, sandbox, authentication, and 16 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

33.2/100 thin ▬ flat Agent 28/100 agent aware Front door AI 5/6 prominent Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreeSelf serve⚡ Free to try

1 published contract 1 MCP Servers 3 Agent Skills

Developer Tools Testing Mock APIapi-sandboxREST GraphQLE2E Testing

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 33.2/100 · thin

Contract Quality 9.0 / 19

Developer Ergonomics 7.4 / 15

Access Clarity 2.6 / 15

Operational Transparency 0.5 / 10

Contract Governance 1.6 / 9

Discoverability 4.8 / 8

Regulatory Posture 1.6 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 28/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author Ask about this →
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented) Ask about this →

7 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 17.0 — up to +16.6 composite points Ask about this →
Contract Quality scores 48.2 — up to +13.0 composite points Ask about this →
Operational Transparency scores 4.8 — up to +12.4 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/playground/apis.yml: open an issue on github.com/api-evangelist/playground to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 3

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

GraphQL

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

REST

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

OpenAPI

measured — observed by APIs.io (published)

APIs 10

Individual APIs this provider publishes, each with its own machine-readable definition.

Playground GraphQL API

GraphQL gateway providing stateful mock query and mutation access to the same dataset, with an interactive explorer.

Playground API — Free Stateful Mock REST & GraphQL Service Auth API

The Auth API from Playground API — Free Stateful Mock REST & GraphQL Service — 4 operation(s) for auth.

Playground API — Free Stateful Mock REST & GraphQL Service Avatars API

The Avatars API from Playground API — Free Stateful Mock REST & GraphQL Service — 1 operation(s) for avatars.

Playground API — Free Stateful Mock REST & GraphQL Service Comments API

The Comments API from Playground API — Free Stateful Mock REST & GraphQL Service — 2 operation(s) for comments.

Playground API — Free Stateful Mock REST & GraphQL Service Custom API

The Custom API from Playground API — Free Stateful Mock REST & GraphQL Service — 4 operation(s) for custom.

Playground API — Free Stateful Mock REST & GraphQL Service Posts API

The Posts API from Playground API — Free Stateful Mock REST & GraphQL Service — 2 operation(s) for posts.

Playground API — Free Stateful Mock REST & GraphQL Service Session API

The Session API from Playground API — Free Stateful Mock REST & GraphQL Service — 3 operation(s) for session.

Playground API — Free Stateful Mock REST & GraphQL Service Thumbnails API

The Thumbnails API from Playground API — Free Stateful Mock REST & GraphQL Service — 1 operation(s) for thumbnails.

Playground API — Free Stateful Mock REST & GraphQL Service Users API

The Users API from Playground API — Free Stateful Mock REST & GraphQL Service — 2 operation(s) for users.

Playground API — Free Stateful Mock REST & GraphQL Service To Dos API

The To Dos API from Playground API — Free Stateful Mock REST & GraphQL Service — 2 operation(s) for to dos.

Scroll for all 10

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Playground API — Free Stateful Mock REST & GraphQL Service MCP Server

MCP SERVER

Agent Skills 3

Packaged agent skills for driving this provider's APIs from an AI assistant.

playground-chaos-simulation

AGENT SKILL

playground-parallel-e2e

AGENT SKILL

playground-stateful-crud

AGENT SKILL

Playground API — Free Stateful Mock REST & GraphQL Service pricing

Prices published by Playground API — Free Stateful Mock REST & GraphQL Service. A free plan or tier is listed.

Plan	Price
Free	Free

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Playground API — Free Stateful Mock REST & GraphQL Service Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Playground API — Free Stateful Mock REST & GraphQL Service Rate Limits

0 limits

RATE LIMITS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Playground API — Free Stateful Mock REST & GraphQL Service API Rules

40 rules · 34 error-severity 4 warn-severity 2 info-severity

SPECTRAL

OpenAPI Overlays 2

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Playground API — Free Stateful Mock REST & GraphQL Service Auth Api Certification Overlay

1 action · update · playground-auth-api-openapi.yml

DERIVED

Playground API — Free Stateful Mock REST & GraphQL Service Openapi Overlay

5 actions · security · playground-openapi.json

GENERATED

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Playground API — Free Stateful Mock REST & GraphQL Service Authentication

1 scheme

SECURITY

Playground API — Free Stateful Mock REST & GraphQL Service Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Sandbox

Sandbox

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgentSkill

AgentSkill

MCPServer

MCPServer

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conformance

DataModel

Lifecycle

ErrorCatalog

Conventions

Build 4

SDKs, sample code, and the tooling you integrate with

SourceCode

SourceCode

GitHubOrganization

GitHubOrganization

ToolCrosswalk

ToolCrosswalk

Packages

Packages

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 1

Pricing, plans, and the legal terms of use

Plans

Plans

Company 2

The organization behind the API

Blog

Blog

Website

Website

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

name: Playground API — Free Stateful Mock REST & GraphQL Service
description: A free, zero-configuration, stateful mock REST and GraphQL API sandbox by Nilesh Kumar / Niles Labs. Unlike static
  mock APIs, it provides stateful per-session virtual mutation overlays where POST/PUT/PATCH/DELETE mutations persist across
  GET queries within a session, while the global baseline dataset remains read-only. Includes chaos/network simulation, dynamic
  collections, avatar/thumbnail generators, and simulated JWT auth loops. MIT licensed, no auth or signup required.
url: https://raw.githubusercontent.com/api-evangelist/playground/refs/heads/main/apis.yml
deliveryModel:
  model: saas
  license_evidence:
    not_product:
    - nileslabs/playground_api
  open_source: unknown
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: low
  source:
  - openapi
  - pricing
  - repository-not-product
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: free
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Free · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  - rate-limits
  - security
  - sandbox
  generated: '2026-11-13'
  method: derived
created: '2026-09-14'
modified: '2026-10-06'
specificationVersion: '0.21'
tags:
- Developer Tools
- Testing
- Mock API
- api-sandbox
- REST
- GraphQL
- E2E Testing
tags_raw:
- developer-tools
- testing
- mock-api
- api-sandbox
- rest
- graphql
- e2e-testing
apis:
- name: Playground GraphQL API
  description: GraphQL gateway providing stateful mock query and mutation access to the same dataset, with an interactive
    explorer.
  humanURL: https://playground.nileslabs.com/docs/graphql
  baseURL: https://playground.nileslabs.com/api/v1/graphql
  tags:
  - Developer Tools
  - Testing
  - Mock API
  - api-sandbox
  - REST
  - GraphQL
  - E2E Testing
  tags_raw:
  - developer-tools
  - testing
  - mock-api
  - api-sandbox
  - rest
  - graphql
  - e2e-testing
  properties:
  - type: GraphQL
    url: https://playground.nileslabs.com/api/v1/graphql
  - type: Documentation
    url: https://playground.nileslabs.com/docs/graphql
- aid: playground:playground-auth-api
  name: Playground API — Free Stateful Mock REST & GraphQL Service Auth API
  description: The Auth API from Playground API — Free Stateful Mock REST & GraphQL Service — 4 operation(s) for auth.
  humanURL: https://playground.nileslabs.com/docs
  baseURL: https://playground.nileslabs.com/api/v1
  tags:
  - Authentication
  tags_raw:
  - Auth
  properties:
  - type: OpenAPI
    url: openapi/playground-auth-api-openapi.yml
  - type: PostmanCollection
    url: https://playground.nileslabs.com/api/v1/downloads/postman.json
  - type: Documentation
    url: https://playground.nileslabs.com/docs
  - type: LLMsTxt
    url: https://playground.nileslabs.com/llms.txt
- aid: playground:playground-avatars-api
  name: Playground API — Free Stateful Mock REST & GraphQL Service Avatars API
  description: The Avatars API from Playground API — Free Stateful Mock REST & GraphQL Service — 1 operation(s) for avatars.
  humanURL: https://playground.nileslabs.com/docs
  baseURL: https://playground.nileslabs.com/api/v1
  tags:
  - Avatars
  properties:
  - type: OpenAPI
    url: openapi/playground-avatars-api-openapi.yml
  - type: PostmanCollection
    url: https://playground.nileslabs.com/api/v1/downloads/postman.json
  - type: Documentation
    url: https://playground.nileslabs.com/docs
  - type: LLMsTxt
    url: https://playground.nileslabs.com/llms.txt
- aid: playground:playground-comments-api
  name: Playground API — Free Stateful Mock REST & GraphQL Service Comments API
  description: The Comments API from Playground API — Free Stateful Mock REST & GraphQL Service — 2 operation(s) for comments.
  humanURL: https://playground.nileslabs.com/docs
  baseURL: https://playground.nileslabs.com/api/v1
  tags:
  - Comments
  properties:
  - type: OpenAPI
    url: openapi/playground-comments-api-openapi.yml
  - type: PostmanCollection
    url: https://playground.nileslabs.com/api/v1/downloads/postman.json
  - type: Documentation
    url: https://playground.nileslabs.com/docs
  - type: LLMsTxt
    url: https://playground.nileslabs.com/llms.txt
- aid: playground:playground-custom-api
  name: Playground API — Free Stateful Mock REST & GraphQL Service Custom API
  description: The Custom API from Playground API — Free Stateful Mock REST & GraphQL Service — 4 operation(s) for custom.
  humanURL: https://playground.nileslabs.com/docs
  baseURL: https://playground.nileslabs.com/api/v1
  tags:
  - Custom
  properties:
  - type: OpenAPI
    url: openapi/playground-custom-api-openapi.yml
  - type: PostmanCollection
    url: https://playground.nileslabs.com/api/v1/downloads/postman.json
  - type: Documentation
    url: https://playground.nileslabs.com/docs
  - type: LLMsTxt
    url: https://playground.nileslabs.com/llms.txt
- aid: playground:playground-posts-api
  name: Playground API — Free Stateful Mock REST & GraphQL Service Posts API
  description: The Posts API from Playground API — Free Stateful Mock REST & GraphQL Service — 2 operation(s) for posts.
  humanURL: https://playground.nileslabs.com/docs
  baseURL: https://playground.nileslabs.com/api/v1
  tags:
  - Posts
  properties:
  - type: OpenAPI
    url: openapi/playground-posts-api-openapi.yml
  - type: PostmanCollection
    url: https://playground.nileslabs.com/api/v1/downloads/postman.json
  - type: Documentation
    url: https://playground.nileslabs.com/docs
  - type: LLMsTxt
    url: https://playground.nileslabs.com/llms.txt
- aid: playground:playground-session-api
  name: Playground API — Free Stateful Mock REST & GraphQL Service Session API
  description: The Session API from Playground API — Free Stateful Mock REST & GraphQL Service — 3 operation(s) for session.
  humanURL: https://playground.nileslabs.com/docs
  baseURL: https://playground.nileslabs.com/api/v1
  tags:
  - Sessions
  tags_raw:
  - Session
  properties:
  - type: OpenAPI
    url: openapi/playground-session-api-openapi.yml
  - type: PostmanCollection
    url: https://playground.nileslabs.com/api/v1/downloads/postman.json
  - type: Documentation
    url: https://playground.nileslabs.com/docs
  - type: LLMsTxt
    url: https://playground.nileslabs.com/llms.txt
- aid: playground:playground-thumbnails-api
  name: Playground API — Free Stateful Mock REST & GraphQL Service Thumbnails API
  description: The Thumbnails API from Playground API — Free Stateful Mock REST & GraphQL Service — 1 operation(s) for thumbnails.
  humanURL: https://playground.nileslabs.com/docs
  baseURL: https://playground.nileslabs.com/api/v1
  tags:
  - Thumbnails
  properties:
  - type: OpenAPI
    url: openapi/playground-thumbnails-api-openapi.yml
  - type: PostmanCollection
    url: https://playground.nileslabs.com/api/v1/downloads/postman.json
  - type: Documentation
    url: https://playground.nileslabs.com/docs
  - type: LLMsTxt
    url: https://playground.nileslabs.com/llms.txt
- aid: playground:playground-users-api
  name: Playground API — Free Stateful Mock REST & GraphQL Service Users API
  description: The Users API from Playground API — Free Stateful Mock REST & GraphQL Service — 2 operation(s) for users.
  humanURL: https://playground.nileslabs.com/docs
  baseURL: https://playground.nileslabs.com/api/v1
  tags:
  - User
  tags_raw:
  - Users
  properties:
  - type: OpenAPI
    url: openapi/playground-users-api-openapi.yml
  - type: PostmanCollection
    url: https://playground.nileslabs.com/api/v1/downloads/postman.json
  - type: Documentation
    url: https://playground.nileslabs.com/docs
  - type: LLMsTxt
    url: https://playground.nileslabs.com/llms.txt
- aid: playground:playground-to-dos-api
  name: Playground API — Free Stateful Mock REST & GraphQL Service To Dos API
  description: The To Dos API from Playground API — Free Stateful Mock REST & GraphQL Service — 2 operation(s) for to dos.
  humanURL: https://playground.nileslabs.com/docs/graphql
  baseURL: https://playground.nileslabs.com/api/v1/graphql
  tags:
  - To-Dos
  tags_raw:
  - To Dos
  properties:
  - type: OpenAPI
    url: openapi/playground-to-dos-api-openapi.yml
  - type: PostmanCollection
    url: https://playground.nileslabs.com/api/v1/downloads/postman.json
  - type: Documentation
    url: https://playground.nileslabs.com/docs
  - type: LLMsTxt
    url: https://playground.nileslabs.com/llms.txt
maintainers:
- FN: Nilesh Kumar
  url: https://nileslabs.com
x-generated:
  by: apis.io/add
  model: claude-opus-4-8
  confidence: 97
  at: '2026-09-14T09:54:24.885Z'
common:
- url: https://playground.nileslabs.com/blog
  type: Blog
- type: Website
  url: https://playground.nileslabs.com
- type: GettingStarted
  url: https://playground.nileslabs.com/docs/quickstart
- type: SourceCode
  url: https://github.com/nileslabs/playground_api
- type: GitHubOrganization
  url: https://github.com/nileslabs
- type: AgentSkill
  url: skills/_index.yml
- type: Overlay
  url: overlays/playground-openapi-overlay.yaml
- type: ToolCrosswalk
  url: mcp/playground-tool-crosswalk.yml
- type: MCPServer
  url: mcp/playground-mcp.yml
- type: Packages
  url: packages/playground-packages.yml
- type: Sandbox
  url: sandbox/playground-sandbox.yml
- type: Conformance
  url: conformance/playground-conformance.yml
- type: Plans
  url: plans/playground-plans-pricing.yml
- type: RateLimits
  url: rate-limits/playground-rate-limits.yml
- type: DataModel
  url: data-model/playground-data-model.yml
- type: Lifecycle
  url: lifecycle/playground-lifecycle.yml
- type: ErrorCatalog
  url: errors/playground-problem-types.yml
- type: Conventions
  url: conventions/playground-conventions.yml
- type: Authentication
  url: authentication/playground-authentication.yml
- type: DomainSecurity
  url: security/playground-domain-security.yml
x-enrichment:
  date: '2026-09-14'
  status: enriched
  artifacts_added: 23
  pass: local-v3

Playground API — Free Stateful Mock REST & GraphQL Service — frequently asked questions

Does Playground API — Free Stateful Mock REST & GraphQL Service have an API?

Yes. APIs.io lists 10 APIs from Playground API — Free Stateful Mock REST & GraphQL Service, including Playground GraphQL API, Playground API — Free Stateful Mock REST & GraphQL Service Auth API and Playground API — Free Stateful Mock REST & GraphQL Service Avatars API, and 7 more.

Is there an OpenAPI specification for the Playground API — Free Stateful Mock REST & GraphQL Service?

Yes. APIs.io indexes 9 OpenAPI specifications for Playground API — Free Stateful Mock REST & GraphQL Service, each linked for download from this page.

How do I authenticate with the Playground API — Free Stateful Mock REST & GraphQL Service?

Playground API — Free Stateful Mock REST & GraphQL Service uses bearer-token authentication (1 scheme). The details are profiled on APIs.io as Playground API — Free Stateful Mock REST & GraphQL Service Authentication.

How much does the Playground API — Free Stateful Mock REST & GraphQL Service cost?

APIs.io lists 1 pricing plan for Playground API — Free Stateful Mock REST & GraphQL Service, with each plan's price, limits and inclusions under Pricing on this page.

Does Playground API — Free Stateful Mock REST & GraphQL Service have an MCP server?

Yes. APIs.io lists 1 MCP server for Playground API — Free Stateful Mock REST & GraphQL Service.

Is the Playground API — Free Stateful Mock REST & GraphQL Service ready for AI agents?

Playground API — Free Stateful Mock REST & GraphQL Service has a Kin Score of 33.2 out of 100 (thin) and an Agent Readiness score of 28.3 (agent-aware), scored by API Evangelist on 2026-11-13.

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