Capsule

Capsule is a CRM and project-management platform for small and mid-sized businesses that unifies contacts, sales pipelines, tasks, cases, and projects. The Capsule REST API exposes parties (contacts and companies), opportunities, projects, tasks, cases, entries, tracks, and settings such as tags, pipelines, milestones, stages, and custom fields, with REST Hooks webhooks for event-driven integration.

Capsule publishes 4 APIs on the APIs.io network, including Opportunities API, Parties API, Projects API, and 1 more. Tagged areas include Contact Management, CRM, Custom Fields, Opportunities, and Pipelines.

The Capsule catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Capsule’s developer surface includes authentication, documentation, pricing, support, engineering blog, changelog, API reference, and 32 more developer resources.

🌐 Visit website 📡 Source on GitHub

62.8/100 strong ▬ flat Agent 40/100 agent ready saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemiumSelf serve⚡ Free to try

1 APIs 1 MCP Servers

Contact Management CRM Custom Fields Opportunities Pipelines Project Management REST Sales Task Webhook

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 62.8/100 · strong

Contract Quality 13.1 / 23

Developer Ergonomics 10.6 / 18

Access Clarity 18.0 / 18

Operational Transparency 8.6 / 12

Contract Governance 0.0 / 11

Discoverability 6.8 / 9

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 40/100 · agent ready

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 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 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 6 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

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.

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 github.com/api-evangelist/capsule: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 4

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

Capsule Opportunities API

The Opportunities API from Capsule — 7 operation(s) for opportunities.

Capsule Parties API

The Parties API from Capsule — 5 operation(s) for parties.

Capsule Projects API

The Projects API from Capsule — 5 operation(s) for projects.

Capsule Tasks API

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

Open Collections 6

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

API Collection

OPEN COLLECTION

Capsule CRM REST Opportunities API

OPEN COLLECTION

Capsule CRM REST Opportunities Parties API

OPEN COLLECTION

Capsule CRM REST Opportunities Projects API

OPEN COLLECTION

Capsule CRM REST Opportunities Tasks API

OPEN COLLECTION

Capsule CRM REST API

OPEN COLLECTION

MCP Servers 1

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

Capsule MCP Server

First-party Model Context Protocol server for Capsule CRM, published by Zestia Ltd (the company that operates Capsule - the capsulecrm.com CAA record names caa-iodef@zestia.com,...

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Capsule Plans Pricing

5 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Capsule Rate Limits

1 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Capsule Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Capsule Rest Hooks Webhooks

ASYNCAPI

Security Posture 4

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

Capsule Authentication

http/oauth2/openIdConnect · 3 schemes

SECURITY

Capsule Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Capsule Vulnerability Disclosure

Hackerone · contact published

SECURITY

Capsule Trust Center

ISO 27001, PCI-DSS, SOC (report)

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Capsule Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Agentic Access 1

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

Capsule Agentic Access

32 operations · 14 acting

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

WellKnown

MCPServer

AgentSkill

LLMsTxt

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conventions

Conformance

ErrorCatalog

Lifecycle

DataModel

Webhooks

Build 3

SDKs, sample code, and the tooling you integrate with

ToolCrosswalk

ToolCrosswalk

Packages

Packages

GitHubOrganization

GitHubOrganization

Access & Security 7

Authentication, authorization, and security posture

DomainSecurity

Authentication

OAuthScopes

Compliance

TrustCenter

Security

VulnerabilityDisclosure

VulnerabilityDisclosure

Scroll for all 7

Operate 5

Status, limits, changes, and where to get help

Support

StatusPage

ChangeLog

RateLimits

HelpCenter

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

PrivacyPolicy

TermsOfService

Plans

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

OpenIDConnect

OpenIDConnect

Source (apis.yml)

aid: capsule
url: https://raw.githubusercontent.com/api-evangelist/capsule/refs/heads/main/apis.yml
name: Capsule
description: Capsule is a CRM and project-management platform for small and mid-sized businesses that unifies contacts, sales
  pipelines, tasks, cases, and projects. The Capsule REST API exposes parties (contacts and companies), opportunities, projects,
  tasks, cases, entries, tracks, and settings such as tags, pipelines, milestones, stages, and custom fields, with REST Hooks
  webhooks for event-driven integration.
type: Index
kind: company
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: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
position: Consuming
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/capsule.png
tags:
- Contact Management
- CRM
- Custom Fields
- Opportunities
- Pipelines
- Project Management
- REST
- Sales
- Task
- Webhook
tags_raw:
- Contact Management
- CRM
- Custom Fields
- Opportunities
- Pipelines
- Project Management
- REST
- Sales
- Tasks
- Webhooks
created: '2025-01-01'
modified: '2026-09-05'
specificationVersion: '0.23'
apis:
- aid: capsule:capsule-opportunities-api
  name: Capsule Opportunities API
  description: The Opportunities API from Capsule — 7 operation(s) for opportunities.
  humanURL: https://developer.capsulecrm.com/
  baseURL: https://api.capsulecrm.com/api/v2
  tags:
  - Opportunities
  properties:
  - type: OpenAPI
    url: openapi/capsule-opportunities-api-openapi.yml
  - type: Overlay
    url: overlays/capsule-opportunities-api-overlay.yaml
  - type: Documentation
    url: https://developer.capsulecrm.com/
  - type: Authentication
    url: https://developer.capsulecrm.com/v2/overview/authentication
  - type: Webhooks
    url: https://developer.capsulecrm.com/v2/overview/avoid-polling-with-rest-hooks
- aid: capsule:capsule-parties-api
  name: Capsule Parties API
  description: The Parties API from Capsule — 5 operation(s) for parties.
  humanURL: https://developer.capsulecrm.com/
  baseURL: https://api.capsulecrm.com/api/v2
  tags:
  - Parties
  properties:
  - type: OpenAPI
    url: openapi/capsule-parties-api-openapi.yml
  - type: Overlay
    url: overlays/capsule-parties-api-overlay.yaml
  - type: Documentation
    url: https://developer.capsulecrm.com/
  - type: Authentication
    url: https://developer.capsulecrm.com/v2/overview/authentication
  - type: Webhooks
    url: https://developer.capsulecrm.com/v2/overview/avoid-polling-with-rest-hooks
- aid: capsule:capsule-projects-api
  name: Capsule Projects API
  description: The Projects API from Capsule — 5 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-projects-api-openapi.yml
  - type: Overlay
    url: overlays/capsule-projects-api-overlay.yaml
  - type: Documentation
    url: https://developer.capsulecrm.com/
  - type: Authentication
    url: https://developer.capsulecrm.com/v2/overview/authentication
  - type: Webhooks
    url: https://developer.capsulecrm.com/v2/overview/avoid-polling-with-rest-hooks
- aid: capsule:capsule-tasks-api
  name: Capsule Tasks API
  description: The Tasks API from Capsule — 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-tasks-api-openapi.yml
  - type: Overlay
    url: overlays/capsule-tasks-api-overlay.yaml
  - type: Documentation
    url: https://developer.capsulecrm.com/
  - type: Authentication
    url: https://developer.capsulecrm.com/v2/overview/authentication
  - type: Webhooks
    url: https://developer.capsulecrm.com/v2/overview/avoid-polling-with-rest-hooks
common:
- type: AgenticAccess
  url: agentic-access/capsule-agentic-access.yml
- type: DomainSecurity
  url: security/capsule-domain-security.yml
- type: Authentication
  url: authentication/capsule-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/capsulecrm
- type: Website
  url: https://capsulecrm.com
- type: Documentation
  url: https://developer.capsulecrm.com/
- type: Pricing
  url: https://capsulecrm.com/pricing
- type: Support
  url: https://capsulecrm.com/support
- type: Blog
  url: https://capsulecrm.com/blog
- type: PrivacyPolicy
  url: https://capsulecrm.com/privacy/
- type: TermsOfService
  url: https://capsulecrm.com/terms/
- type: Integrations
  url: https://capsulecrm.com/integrations/
- type: WellKnown
  url: well-known/capsule-well-known.yml
- type: OpenIDConnect
  url: https://api.capsulecrm.com/.well-known/openid-configuration
- type: OAuthScopes
  url: scopes/capsule-scopes.yml
- type: MCPServer
  url: mcp/capsule-mcp.yml
- type: ToolCrosswalk
  url: mcp/capsule-tool-crosswalk.yml
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/capsule-llms.txt
- type: Conventions
  url: conventions/capsule-conventions.yml
- type: Conformance
  url: conformance/capsule-conformance.yml
- type: Compliance
  url: https://capsulecrm.com/security/
- type: TrustCenter
  url: security/capsule-trust-center.yml
- type: Security
  url: security/capsule-vulnerability-disclosure.yml
- type: VulnerabilityDisclosure
  url: security/capsule-vulnerability-disclosure.yml
- type: ErrorCatalog
  url: errors/capsule-problem-types.yml
- type: Lifecycle
  url: lifecycle/capsule-lifecycle.yml
- type: StatusPage
  url: https://status.capsulecrm.com/
- type: ChangeLog
  url: changelog/capsule-changelog.yml
- type: DataModel
  url: data-model/capsule-data-model.yml
- type: Packages
  url: packages/capsule-packages.yml
- type: RateLimits
  url: rate-limits/capsule-rate-limits.yml
- type: Plans
  url: plans/capsule-plans-pricing.yml
- type: Webhooks
  url: asyncapi/capsule-rest-hooks-webhooks.yml
- type: DeveloperPortal
  url: https://developer.capsulecrm.com/
- type: APIReference
  url: https://developer.capsulecrm.com/v2/operations/Party
- type: GettingStarted
  url: https://developer.capsulecrm.com/v2/overview/authentication
- type: SignUp
  url: https://capsulecrm.com/signup/
- type: GitHubOrganization
  url: https://github.com/zestia
- type: HelpCenter
  url: https://capsulecrm.com/help/
integrations:
- name: QuickBooks
- name: Xero
- name: Zapier
- name: Mailchimp
- name: Gmail
- name: Outlook
- name: Transpond
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-enrichment:
  date: '2026-09-05'
  status: enriched
  artifacts_added: 26
  pass: local-v3

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