Capxule

Capxule is "the context marketplace for AI": a marketplace of capsules, handcrafted context on one topic (real approaches, trade-offs and evidence gathered by people who know the topic) that a person steps through as a guided journey, reaches a decision they can act on, and keeps as a companion. It also offers practice tests (driving permits, CDL, citizenship, aviation, amateur radio). Humans use capxule.com and iOS/Android apps; AI agents use capxule.ai, an agent-facing site with a remote MCP server (https://capxule.ai/mcp and /mcp/open), an agent skill, an index.json catalog, a JSON status endpoint and a small OpenAPI 3.1 REST surface, with guest, OAuth-delegated and Web Bot Auth machine principals.

Capxule publishes 4 API contracts indexed on the APIs.io network, including Account API, Catalog API, Plan API, and 1 more. Tagged areas include Company, Context Marketplace, Artificial Intelligence, AI Agents, and Model Context Protocol.

The Capxule catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Capxule’s developer surface includes changelog, sandbox, pricing, API reference, authentication, documentation, getting-started guide, and 38 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

40.8/100 developing Agent 25/100 agent aware Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 published contract 1 MCP Servers 2 Agent Skills

CompanyContext MarketplaceArtificial Intelligence AI AgentsModel Context ProtocolEducation Test Preparation Knowledge

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 40.8/100 · developing

Contract Quality 9.1 / 21

Developer Ergonomics 3.0 / 17

Access Clarity 7.0 / 17

Operational Transparency 4.5 / 11

Contract Governance 5.0 / 10

Discoverability 6.2 / 9

Regulatory Posture 2.6 / 15

Agent readiness — 25/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 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 Education & Research 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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

9 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 17.9 — up to +16.4 composite points
Contract Quality scores 42.7 — up to +14.3 composite points
Access Clarity scores 41.3 — up to +11.7 composite points

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.

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/capxule-ai/apis.yml: open an issue on github.com/api-evangelist/capxule-ai 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 2

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.

OpenAPI

measured — observed by APIs.io (published)

OAuth 2.0

measured — observed by APIs.io (declared)

APIs 4

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

Capxule Agent MCP Server

Remote MCP server (capxule-agent 1.0.0, MCP 2025-06-18, streamable-http, stateless) for stepping through capsule journeys; https://capxule.ai/mcp supports connector OAuth for de...

Capxule Account API

The Account API from Capxule — 3 operation(s) for account.

Capxule Catalog API

The Catalog API from Capxule — 2 operation(s) for catalog.

Capxule Plan API

The Plan API from Capxule — 1 operation(s) for plan.

MCP Servers 1

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

Capxule MCP server (capxule-agent)

Remote MCP server at capxule.ai over streamable HTTP requiring OAuth; 12 tools listed.

MCP SERVER

Agent Skills 2

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

capxule-ai-browse-the-journey-catalog

AGENT SKILL

capxule-ai-send-a-plan-upgrade-page

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Capxule Ai Plans Pricing

2 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Capxule Ai Rate Limits

8 limits

RATE LIMITS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Capxule Ai Context

1 classes · 1 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Capxule API Rules

53 rules · 51 errors 1 warnings 1 info

SPECTRAL

OpenAPI Overlays 1

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.

Capxule Ai Openapi Overlay

7 actions · update · capxule-ai-openapi.yml

DERIVED

JSON Schema 5

Standalone JSON Schema definitions for this provider's data models.

Beat

21 properties

JSON SCHEMA

Catalog card

17 properties

JSON SCHEMA

Session contract

13 properties

JSON SCHEMA

Error envelope

1 properties

JSON SCHEMA

Journey state

16 properties

JSON SCHEMA

Security Posture 2

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

Capxule Ai Authentication

http/oauth2/apiKey/none · 6 schemes

SECURITY

Capxule Ai Domain Security

TLSv1.3

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Capxule Ai Scopes

4 scopes

SCOPES

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Capxule Ai Agentic Access

6 operations · 3 acting

AGENTIC

Resources

Get Started 4

Portal, sign-up, and the first successful call

Sandbox

Sandbox

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 2

Reference material describing how the API behaves

APIReference

APIReference

Documentation

Documentation

Agent Surfaces 6

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

MCPServer

WellKnown

LLMsTxt

Design & Contract 11

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Components

Idempotency

Conventions

Lifecycle

ErrorCatalog

ErrorCatalog

Conformance

Scroll for all 11

Build 2

SDKs, sample code, and the tooling you integrate with

ToolCrosswalk

ToolCrosswalk

IntegrationEdges

IntegrationEdges

Access & Security 3

Authentication, authorization, and security posture

OAuthScopes

OAuthScopes

Authentication

Authentication

DomainSecurity

DomainSecurity

Learn 1

Tutorials, courses, talks, and written guidance

YouTube

YouTube

Operate 5

Status, limits, changes, and where to get help

RateLimits

ChangeLog

Deprecation

StatusPage

Support

Commercial 5

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

Company 4

The organization behind the API

Website

Website

Blog

Blog

About

About

LinkedIn

Other 2

Properties that don't map to a standard resource type

Overlay

Overlay

Hosts

Hosts

Source (apis.yml)

aid: capxule-ai
name: Capxule
description: 'Capxule is "the context marketplace for AI": a marketplace of capsules, handcrafted context on one topic (real
  approaches, trade-offs and evidence gathered by people who know the topic) that a person steps through as a guided journey,
  reaches a decision they can act on, and keeps as a companion. It also offers practice tests (driving permits, CDL, citizenship,
  aviation, amateur radio). Humans use capxule.com and iOS/Android apps; AI agents use capxule.ai, an agent-facing site with
  a remote MCP server (https://capxule.ai/mcp and /mcp/open), an agent skill, an index.json catalog, a JSON status endpoint
  and a small OpenAPI 3.1 REST surface, with guest, OAuth-delegated and Web Bot Auth machine principals.'
url: https://artifacts.apis.io/capxule-ai/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-03 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-03'
modified: '2026-11-03'
tags:
- Company
- Context Marketplace
- Artificial Intelligence
- AI Agents
- Model Context Protocol
- Education
- Test Preparation
- Knowledge
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
image: https://capxule.com/og/en.png
common:
- type: AgenticAccess
  url: agentic-access/capxule-ai-agentic-access.yml
- type: RateLimits
  url: rate-limits/capxule-ai-rate-limits.yml
- type: Plans
  url: plans/capxule-ai-plans-pricing.yml
- type: Spectral
  url: rules/capxule-ai-rules.yml
- type: JSONLD
  url: json-ld/capxule-ai-context.jsonld
- type: Vocabulary
  url: vocabulary/capxule-ai-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/capxule-ai-data-model.yml
- type: Components
  url: components/capxule-ai-components.yml
- type: ChangeLog
  url: changelog/capxule-ai-changelog.yml
- type: Idempotency
  url: conventions/capxule-ai-conventions.yml
- type: Conventions
  url: conventions/capxule-ai-conventions.yml
- type: Sandbox
  url: sandbox/capxule-ai-sandbox.yml
- type: OAuthScopes
  url: scopes/capxule-ai-scopes.yml
- type: Deprecation
  url: https://capxule.ai/changelog.jsonl
- type: Lifecycle
  url: lifecycle/capxule-ai-lifecycle.yml
- type: ErrorCatalog
  url: errors/capxule-ai-error-codes.yml
- type: ErrorCatalog
  url: errors/capxule-ai-problem-types.yml
- type: Conformance
  url: conformance/capxule-ai-conformance.yml
- type: Overlay
  url: overlays/capxule-ai-openapi-overlay.yaml
- type: LLMsTxt
  url: llms/capxule-ai-llms.txt
- type: ToolCrosswalk
  url: mcp/capxule-ai-tool-crosswalk.yml
- type: MCPServer
  url: mcp/capxule-ai-mcp.yml
- type: WellKnown
  url: well-known/capxule-ai-well-known.yml
- type: Hosts
  url: hosts/capxule-ai-hosts.yml
- type: IntegrationEdges
  url: integrations/capxule-ai-integration-edges.yml
- type: Pricing
  url: https://capxule.com/pricing
- type: APIReference
  url: https://capxule.com/llms.txt
- type: Authentication
  url: authentication/capxule-ai-authentication.yml
- type: DomainSecurity
  url: security/capxule-ai-domain-security.yml
- type: Website
  url: https://capxule.com/
- type: Documentation
  url: https://capxule.ai/
- type: LLMsTxt
  url: https://capxule.ai/llms.txt
- type: StatusPage
  url: https://capxule.ai/status
- type: GettingStarted
  url: https://capxule.com/connect
- type: Blog
  url: https://capxule.com/blog
- type: About
  url: https://capxule.com/about
- type: Support
  url: https://capxule.com/contact
- type: SignUp
  url: https://capxule.com/sign-up
- type: Login
  url: https://capxule.com/sign-in
- type: TermsOfService
  url: https://capxule.com/terms
- type: TermsOfService
  url: https://capxule.ai/terms
  description: Agent-facing terms on capxule.ai
- type: PrivacyPolicy
  url: https://capxule.com/privacy
- type: LinkedIn
  url: https://www.linkedin.com/company/capxuleai
- type: YouTube
  url: https://www.youtube.com/@Capxule
apis:
- aid: capxule-ai:capxule-ai-mcp
  name: Capxule Agent MCP Server
  description: Remote MCP server (capxule-agent 1.0.0, MCP 2025-06-18, streamable-http, stateless) for stepping through capsule
    journeys; https://capxule.ai/mcp supports connector OAuth for delegated principals and https://capxule.ai/mcp/open serves
    guest/open access with per-day limits. A separate Studio connector at https://capxule.ai/mcp/studio needs the creator's
    Studio key.
  humanURL: https://capxule.ai/
  baseURL: https://capxule.ai/mcp
  tags:
  - Model Context Protocol
  - AI Agents
  properties:
  - type: Documentation
    url: https://capxule.ai/llms.txt
- aid: capxule-ai:capxule-ai-account-api
  name: Capxule Account API
  description: The Account API from Capxule — 3 operation(s) for account.
  humanURL: https://capxule.ai/
  baseURL: https://capxule.ai
  tags:
  - Account
  properties:
  - type: OpenAPI
    url: openapi/capxule-ai-account-api-openapi.yml
  - type: JSONSchema
    url: json-schema/capxule-ai-beat-schema.json
  - type: JSONSchema
    url: json-schema/capxule-ai-contract-schema.json
  - type: JSONSchema
    url: json-schema/capxule-ai-state-schema.json
  - type: JSONSchema
    url: json-schema/capxule-ai-card-schema.json
  - type: JSONSchema
    url: json-schema/capxule-ai-error-schema.json
  - type: Documentation
    url: https://capxule.ai/llms.txt
- aid: capxule-ai:capxule-ai-catalog-api
  name: Capxule Catalog API
  description: The Catalog API from Capxule — 2 operation(s) for catalog.
  humanURL: https://capxule.ai/
  baseURL: https://capxule.ai
  tags:
  - Catalog
  properties:
  - type: OpenAPI
    url: openapi/capxule-ai-catalog-api-openapi.yml
  - type: JSONSchema
    url: json-schema/capxule-ai-beat-schema.json
  - type: JSONSchema
    url: json-schema/capxule-ai-contract-schema.json
  - type: JSONSchema
    url: json-schema/capxule-ai-state-schema.json
  - type: JSONSchema
    url: json-schema/capxule-ai-card-schema.json
  - type: JSONSchema
    url: json-schema/capxule-ai-error-schema.json
  - type: Documentation
    url: https://capxule.ai/llms.txt
- aid: capxule-ai:capxule-ai-plan-api
  name: Capxule Plan API
  description: The Plan API from Capxule — 1 operation(s) for plan.
  humanURL: https://capxule.ai/
  baseURL: https://capxule.ai
  tags:
  - Plan
  properties:
  - type: OpenAPI
    url: openapi/capxule-ai-plan-api-openapi.yml
  - type: JSONSchema
    url: json-schema/capxule-ai-beat-schema.json
  - type: JSONSchema
    url: json-schema/capxule-ai-contract-schema.json
  - type: JSONSchema
    url: json-schema/capxule-ai-state-schema.json
  - type: JSONSchema
    url: json-schema/capxule-ai-card-schema.json
  - type: JSONSchema
    url: json-schema/capxule-ai-error-schema.json
  - type: Documentation
    url: https://capxule.ai/llms.txt
x-coverage:
  state: covered
  reason: identity-verified
  detail: capxule.ai is the agent-facing site and names https://capxule.com as its human site; capxule.com titles itself "Capxule
    - The Context Marketplace" with footer "© 2026 Capxule". Pointers taken from links on both sites; /pricing not linked
    (not added), /plans redirects to app sign-in, GitHub org github.com/capxule does not link back (not added).
  evidence:
  - url: https://capxule.ai/
    status: 200
  - url: https://capxule.com/
    status: 200
  - url: https://capxule.ai/identity
    status: 200
  - url: https://capxule.com/blog
    status: 200
  - url: https://capxule.com/privacy
    status: 200
  - url: https://capxule.com/terms
    status: 200
  - url: https://capxule.com/connect
    status: 200
  - url: https://capxule.com/contact
    status: 200
  - url: https://capxule.ai/status
    status: 200
  - url: https://capxule.ai/llms.txt
    status: 200
x-enrichment:
  date: '2026-11-03'
  status: enriched
  artifacts_added: 50
  pass: modular-v1
  engine: identity=anthropic,contract=anthropic,surfaces=anthropic,docs=anthropic,regulatory=anthropic

Capxule API — frequently asked questions

Does Capxule have an API?

Yes. APIs.io lists 4 APIs from Capxule, including Capxule Agent MCP Server, Capxule Account API and Capxule Catalog API, and 1 more.

Is there an OpenAPI specification for the Capxule API?

Yes. APIs.io indexes 3 OpenAPI specifications for Capxule, each linked for download from this page.

How do I authenticate with the Capxule API?

Capxule documents its authentication (http/oauth2/apiKey/none · 6 schemes). The details are profiled on APIs.io as Capxule Ai Authentication.

How much does the Capxule API cost?

APIs.io lists 2 pricing plans for Capxule, with each plan's price, limits and inclusions under Pricing on this page.

Does Capxule have an MCP server?

Yes. APIs.io lists 1 MCP server for Capxule: Remote MCP server at capxule.ai over streamable HTTP requiring OAuth; 12 tools listed.

Is the Capxule API ready for AI agents?

Capxule has a Kin Score of 40.8 out of 100 (developing) and an Agent Readiness score of 25.2 (agent-aware), scored by API Evangelist on 2026-11-06.

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