Capsule CRM

Capsule is a simple online CRM for small and midsize businesses that manages contacts, sales pipelines, tasks, projects, and email integration with a focus on ease of use. The Capsule API v2 is a REST/JSON service exposing parties (people and organisations), opportunities, projects, tasks, cases, users, and custom fields for integration with marketing, finance, and productivity tools. Authentication uses a Bearer token (personal access token or OAuth 2 access token) against the base URL https://api.capsulecrm.com/api/v2/.

Capsule CRM publishes 6 API contracts indexed on the APIs.io network, including Entries API, Opportunities API, Parties API, and 3 more. Tagged areas include CRM, Sales, Contacts, Pipeline Management, and Task.

The Capsule CRM catalog on APIs.io includes 1 Spectral governance ruleset.

Capsule CRM’s developer surface includes authentication, documentation, pricing, signup flow, support, engineering blog, and 10 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

32.4/100 thin ▬ flat Agent 20/100 agent aware Front door AI 3/6 light saas Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

4 published contracts 1 MCP Servers

CRM Sales Contacts Pipeline Management Task Project Small Business

What this lets a business do 2

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Sales Management

BC-410

Opportunities

GET /opportunities POST /opportunities GET /opportunities/search

Customer Relationship Management

BC-420

Parties

GET /parties

Kin Score

Kin Score How this is scored →
scored 2026-11-02 · rubric v0.26.0

Composite quality — 32.4/100 · thin

Contract Quality 9.4 / 19

Developer Ergonomics 5.7 / 15

Access Clarity 3.6 / 15

Operational Transparency 0.0 / 10

Contract Governance 1.2 / 9

Discoverability 5.3 / 8

Regulatory Posture 1.8 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 20/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 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 0 / 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):

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
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

10 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 23.7 — up to +15.3 composite points
Operational Transparency scores 0.0 — up to +13.0 composite points
Developer Ergonomics scores 38.1 — up to +12.4 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/capsule-crm/apis.yml: open an issue on github.com/api-evangelist/capsule-crm 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Zoom App Marketplace and Partner Ecosystem (builders and partners on Zoom)	builds-on	29.6	-	-
Xero App Store (SMB finance, payroll, inventory and invoicing apps built on Xero, by region)	builds-on	29.6	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

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.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

OpenAPI

measured — observed by APIs.io (published)

APIs 6

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

Capsule CRM API v2

REST API for managing Capsule parties (contacts and organisations), opportunities, projects (cases), tasks, users, tags, and custom fields. Each request must include an Authoriz...

Capsule CRM Entries API

The Entries API from Capsule CRM — 2 operation(s) for entries.

Capsule CRM Opportunities API

The Opportunities API from Capsule CRM — 3 operation(s) for opportunities.

Capsule CRM Parties API

The Parties API from Capsule CRM — 4 operation(s) for parties.

Capsule CRM Projects API

The Projects API from Capsule CRM — 2 operation(s) for projects.

Capsule CRM Tasks API

The Tasks API from Capsule CRM — 2 operation(s) for tasks.

Open Collections 6

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Capsule CRM API v2 Entries API

OPEN COLLECTION

Capsule CRM API v2 Entries Opportunities API

OPEN COLLECTION

Capsule CRM API v2 Entries Parties API

OPEN COLLECTION

Capsule CRM API v2 Entries Projects API

OPEN COLLECTION

Capsule CRM API v2 Entries Tasks API

OPEN COLLECTION

Capsule CRM API v2

OPEN COLLECTION

MCP Servers 1

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

MCP Server

MCP SERVER

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Capsule CRM API Rules

47 rules · 45 errors 1 warnings 1 info

SPECTRAL

OpenAPI Overlays 3

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.

Capsule Opportunities Api Overlay

23 actions · documentation · capsule-opportunities-api-openapi.yml

GENERATED

Capsule Parties Api Overlay

17 actions · documentation · capsule-parties-api-openapi.yml

GENERATED

Capsule Projects Api Overlay

17 actions · documentation · capsule-projects-api-openapi.yml

GENERATED

Security Posture 2

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

Capsule Crm Authentication

http · 1 scheme

SECURITY

Capsule Crm Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Capsule Crm Agentic Access

27 operations · 15 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

Signup

Signup

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

MCPServer

MCPServer

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 1

Pricing, plans, and the legal terms of use

Pricing

Pricing

Company 3

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

Other 4

Properties that don't map to a standard resource type

CapabilityMap

Overlay

Overlay

Overlay

Source (apis.yml)

aid: capsule-crm
name: Capsule CRM
description: Capsule is a simple online CRM for small and midsize businesses that manages contacts, sales pipelines, tasks,
  projects, and email integration with a focus on ease of use. The Capsule API v2 is a REST/JSON service exposing parties
  (people and organisations), opportunities, projects, tasks, cases, users, and custom fields for integration with marketing,
  finance, and productivity tools. Authentication uses a Bearer token (personal access token or OAuth 2 access token) against
  the base URL https://api.capsulecrm.com/api/v2/.
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-02'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/capsule-crm.png
tags:
- CRM
- Sales
- Contacts
- Pipeline Management
- Task
- Project
- Small Business
tags_raw:
- CRM
- Sales
- Contacts
- Pipeline Management
- Tasks
- Projects
- SMB
url: https://raw.githubusercontent.com/api-evangelist/capsule-crm/refs/heads/main/apis.yml
created: '2026-05-11'
modified: '2026-07-12'
specificationVersion: '0.23'
apis:
- aid: capsule-crm:v2-api
  name: Capsule CRM API v2
  description: REST API for managing Capsule parties (contacts and organisations), opportunities, projects (cases), tasks,
    users, tags, and custom fields. Each request must include an Authorization Bearer token obtained from a personal access
    token or the OAuth 2 authorization code flow.
  humanURL: https://developer.capsulecrm.com/
  baseURL: https://api.capsulecrm.com/api/v2/
  tags:
  - CRM
  - Contacts
  - Opportunities
  - Project
  - Task
  - OAuth
  - Authentication
  tags_raw:
  - CRM
  - Contacts
  - Opportunities
  - Projects
  - Tasks
  - OAuth
  - Authentication
  properties:
  - type: Documentation
    url: https://developer.capsulecrm.com/
  - type: Authentication
    url: https://developer.capsulecrm.com/v2/overview/authentication
- aid: capsule-crm:capsule-crm-entries-api
  name: Capsule CRM Entries API
  description: The Entries API from Capsule CRM — 2 operation(s) for entries.
  humanURL: https://developer.capsulecrm.com/
  baseURL: https://api.capsulecrm.com/api/v2/
  tags:
  - Entries
  properties:
  - type: OpenAPI
    url: openapi/capsule-crm-entries-api-openapi.yml
- aid: capsule-crm:capsule-crm-opportunities-api
  name: Capsule CRM Opportunities API
  description: The Opportunities API from Capsule CRM — 3 operation(s) for opportunities.
  humanURL: https://developer.capsulecrm.com/
  baseURL: https://api.capsulecrm.com/api/v2/
  tags:
  - Opportunities
  properties:
  - type: OpenAPI
    url: openapi/capsule-crm-opportunities-api-openapi.yml
- aid: capsule-crm:capsule-crm-parties-api
  name: Capsule CRM Parties API
  description: The Parties API from Capsule CRM — 4 operation(s) for parties.
  humanURL: https://developer.capsulecrm.com/
  baseURL: https://api.capsulecrm.com/api/v2/
  tags:
  - Parties
  properties:
  - type: OpenAPI
    url: openapi/capsule-crm-parties-api-openapi.yml
- aid: capsule-crm:capsule-crm-projects-api
  name: Capsule CRM Projects API
  description: The Projects API from Capsule CRM — 2 operation(s) for projects.
  humanURL: https://developer.capsulecrm.com/
  baseURL: https://api.capsulecrm.com/api/v2/
  tags:
  - Project
  tags_raw:
  - Projects
  properties:
  - type: OpenAPI
    url: openapi/capsule-crm-projects-api-openapi.yml
- aid: capsule-crm:capsule-crm-tasks-api
  name: Capsule CRM Tasks API
  description: The Tasks API from Capsule CRM — 2 operation(s) for tasks.
  humanURL: https://developer.capsulecrm.com/
  baseURL: https://api.capsulecrm.com/api/v2/
  tags:
  - Task
  tags_raw:
  - Tasks
  properties:
  - type: OpenAPI
    url: openapi/capsule-crm-tasks-api-openapi.yml
common:
- type: CapabilityMap
  url: capabilities/capsule-crm-capability-edges.yml
  name: Capsule CRM Business Capability Map
- type: Overlay
  url: overlays/capsule-opportunities-api-overlay.yaml
- type: Overlay
  url: overlays/capsule-parties-api-overlay.yaml
- type: Overlay
  url: overlays/capsule-projects-api-overlay.yaml
- type: AgenticAccess
  url: agentic-access/capsule-crm-agentic-access.yml
- type: DomainSecurity
  url: security/capsule-crm-domain-security.yml
- type: Authentication
  url: authentication/capsule-crm-authentication.yml
- type: Website
  url: https://capsulecrm.com
- type: DeveloperPortal
  url: https://developer.capsulecrm.com
- type: Documentation
  url: https://developer.capsulecrm.com/
- type: Pricing
  url: https://capsulecrm.com/pricing/
- type: Signup
  url: https://capsulecrm.com/signup/
- type: Support
  url: https://support.capsulecrm.com
- type: LinkedIn
  url: https://www.linkedin.com/company/capsule-crm
- url: https://capsulecrm.com/blog/
  type: Blog
- name: MCP Server
  url: https://capsulecrm.com/blog/what-if-you-could-just-ask-your-crm-introducing-capsule-mcp/
  type: MCPServer
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Capsule CRM API — frequently asked questions

Does Capsule CRM have an API?

Yes. APIs.io lists 6 APIs from Capsule CRM, including Capsule CRM API v2, Capsule CRM Entries API and Capsule CRM Opportunities API, and 3 more.

Is there an OpenAPI specification for the Capsule CRM API?

Yes. APIs.io indexes 5 OpenAPI specifications for Capsule CRM, each linked for download from this page.

How do I authenticate with the Capsule CRM API?

Capsule CRM uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Capsule Crm Authentication.

Does Capsule CRM have an MCP server?

Yes. APIs.io lists 1 MCP server for Capsule CRM.

Is the Capsule CRM API ready for AI agents?

Capsule CRM has a Kin Score of 32.4 out of 100 (thin) and an Agent Readiness score of 19.9 (agent-aware), scored by API Evangelist on 2026-11-02.

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