Capmus

Capmus (capmus.com) is a classifieds marketplace for university communities, where students and staff buy and sell with classmates, find housing and sublets near campus, post campus and off-campus jobs, tutoring and services, and share community posts and events. Posting from a verified university email (e.g. @stanford.edu) scopes listings to a campus. Its llms.txt advertises a read-only public listings API with an OpenAPI description, plus public endpoints for messaging posters and creating post drafts.

Capmus publishes 1 API contract indexed on the APIs.io network: Public API. Tagged areas include Company, Marketplace, Classifieds, Students, and Universities.

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

Capmus’ developer surface includes support, API reference, and 24 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

27.7/100 thin 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

Company Marketplace Classifieds Students Universities HousingJobsEducation

Kin Score

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

Composite quality — 27.7/100 · thin

Contract Quality 10.8 / 21

Developer Ergonomics 1.0 / 17

Access Clarity 1.8 / 17

Operational Transparency 0.0 / 11

Contract Governance 5.0 / 10

Discoverability 6.2 / 9

Regulatory Posture 1.3 / 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 6.0 — up to +18.8 composite points
Access Clarity scores 10.5 — up to +17.9 composite points
Operational Transparency scores 0.0 — up to +13.0 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/capmus-com/apis.yml: open an issue on github.com/api-evangelist/capmus-com 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 1

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)

APIs 1

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

Capmus Public API

The Public API from Capmus — 4 operation(s) for public.

MCP Servers 1

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

Capmus MCP Server

Official remote MCP server published by Capmus-Team in the official MCP Registry as io.github.Capmus-Team/capmus-mcp (v0.2.2, streamable-http). Search listings, message posters ...

MCP SERVER

Agent Skills 2

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

capmus-create-post-draft

AGENT SKILL

capmus-find-and-contact-listing

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Capmus Com Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Capmus Com Rate Limits

0 limits

RATE LIMITS

Semantic Vocabularies 1

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

Capmus Com Context

5 classes · 19 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Capmus API Rules

46 rules · 44 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.

Capmus Com Openapi Overlay

5 actions · documentation · capmus-com-openapi.yml

DERIVED

JSON Schema 3

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

DraftCreated

5 properties

JSON SCHEMA

Listing

8 properties

JSON SCHEMA

MessagePending

4 properties

JSON SCHEMA

Security Posture 2

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

Capmus Com Authentication

0 schemes

SECURITY

Capmus Com Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Capmus Com Agentic Access

4 operations · 2 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

MCPServer

LLMsTxt

Design & Contract 8

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conventions

Lifecycle

ErrorCatalog

Conformance

Scroll for all 8

Build 1

SDKs, sample code, and the tooling you integrate with

ToolCrosswalk

ToolCrosswalk

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

Support

Support

Contact

Contact

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

About

About

Other 4

Properties that don't map to a standard resource type

Overlay

Hosts

Vendors

Feed

Source (apis.yml)

aid: capmus-com
name: Capmus
description: Capmus (capmus.com) is a classifieds marketplace for university communities, where students and staff buy and
  sell with classmates, find housing and sublets near campus, post campus and off-campus jobs, tutoring and services, and
  share community posts and events. Posting from a verified university email (e.g. @stanford.edu) scopes listings to a campus.
  Its llms.txt advertises a read-only public listings API with an OpenAPI description, plus public endpoints for messaging
  posters and creating post drafts.
url: https://artifacts.apis.io/capmus-com/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
- Marketplace
- Classifieds
- Students
- Universities
- Housing
- Jobs
- Education
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
image: https://capmus.com/opengraph-image?82db7948e9e1b54
common:
- type: AgenticAccess
  url: agentic-access/capmus-com-agentic-access.yml
- type: Spectral
  url: rules/capmus-com-rules.yml
- type: JSONLD
  url: json-ld/capmus-com-context.jsonld
- type: Vocabulary
  url: vocabulary/capmus-com-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/capmus-com-data-model.yml
- type: Conventions
  url: conventions/capmus-com-conventions.yml
- type: Lifecycle
  url: lifecycle/capmus-com-lifecycle.yml
- type: ErrorCatalog
  url: errors/capmus-com-problem-types.yml
- type: Conformance
  url: conformance/capmus-com-conformance.yml
- type: Overlay
  url: overlays/capmus-com-openapi-overlay.yaml
- type: LLMsTxt
  url: llms/capmus-com-llms.txt
- type: ToolCrosswalk
  url: mcp/capmus-com-tool-crosswalk.yml
- type: MCPServer
  url: mcp/capmus-com-mcp.yml
- type: Hosts
  url: hosts/capmus-com-hosts.yml
- type: Vendors
  url: vendors/capmus-com-vendors.yml
- type: DomainSecurity
  url: security/capmus-com-domain-security.yml
- type: Website
  url: https://capmus.com/
- type: About
  url: https://capmus.com/about
- type: Support
  url: https://capmus.com/help
- type: Contact
  url: https://capmus.com/contact
- type: TermsOfService
  url: https://capmus.com/terms
- type: PrivacyPolicy
  url: https://capmus.com/privacy
- type: LLMsTxt
  url: https://capmus.com/llms.txt
- type: APIReference
  url: https://capmus.com/api/public/openapi.json
- type: Feed
  url: https://capmus.com/feed.xml
apis:
- aid: capmus-com:capmus-com-public-api
  name: Capmus Public API
  description: The Public API from Capmus — 4 operation(s) for public.
  humanURL: https://capmus.com/llms.txt
  baseURL: https://capmus.com
  tags:
  - Public
  properties:
  - type: OpenAPI
    url: openapi/capmus-com-public-api-openapi.yml
  - type: JSONSchema
    url: json-schema/capmus-com-listing-schema.json
  - type: JSONSchema
    url: json-schema/capmus-com-draft-created-schema.json
  - type: JSONSchema
    url: json-schema/capmus-com-message-pending-schema.json
x-coverage:
  state: covered
  reason: identity-verified
  detail: Name, description, image and pointers taken from capmus.com pages and its llms.txt (all GET, 200).
  evidence:
  - url: https://capmus.com/
    status: 200
  - url: https://capmus.com/about
    status: 200
  - url: https://capmus.com/llms.txt
    status: 200
  - url: https://capmus.com/help
    status: 200
  - url: https://capmus.com/contact
    status: 200
  - url: https://capmus.com/terms
    status: 200
  - url: https://capmus.com/privacy
    status: 200
  - url: https://capmus.com/api/public/openapi.json
    status: 200
  - url: https://capmus.com/feed.xml
    status: 200
  - url: https://capmus.com/opengraph-image?82db7948e9e1b54
    status: 200
x-enrichment:
  date: '2026-11-03'
  status: enriched
  artifacts_added: 34
  pass: modular-v1
  engine: identity=anthropic,contract=anthropic,surfaces=anthropic,docs=anthropic,regulatory=anthropic

Capmus API — frequently asked questions

Does Capmus have an API?

Yes. APIs.io lists 1 API from Capmus, including Capmus Public API.

Is there an OpenAPI specification for the Capmus API?

Yes. APIs.io indexes 1 OpenAPI specification for Capmus, each linked for download from this page.

How do I authenticate with the Capmus API?

Capmus documents its authentication (0 schemes). The details are profiled on APIs.io as Capmus Com Authentication.

Does Capmus have an MCP server?

Yes. APIs.io lists 1 MCP server for Capmus: Official remote MCP server published by Capmus-Team in the official MCP Registry as io.github.Capmus-Team/capmus-mcp (v0.2.2, streamable-http). Search listings, message posters and create draft posts

Is the Capmus API ready for AI agents?

Capmus has a Kin Score of 27.7 out of 100 (thin) and an Agent Readiness score of 25.2 (agent-aware), scored by API Evangelist on 2026-11-06.

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