Nutshell website screenshot

Nutshell

Nutshell is a CRM and email marketing platform for small to mid-sized B2B sales teams, providing pipeline management, contact and company records, reporting, automation, and built-in email campaigns. The product unifies sales pipelines, activity tracking, and outbound communications in one workspace with mobile and desktop clients. Nutshell exposes a REST API for contacts, leads, accounts, activities, and pipelines, plus a legacy JSON-RPC API, both authenticated with an API key.

Nutshell publishes 5 APIs on the APIs.io network, including Accounts API, Activities API, Contacts API, and 2 more. Tagged areas include CRM, Sales, Pipeline Management, Email Marketing, and Contact Management.

Nutshell’s developer surface includes authentication, documentation, pricing, signup flow, support, engineering blog, and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub
29.5/100 thin ▬ flat Agent 28/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6
AccessSelf serve
7 APIs
CRMSalesPipeline ManagementEmail MarketingContact ManagementSales Automation

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6
Composite quality — 29.5/100 · thin
Contract Quality 12.5 / 25
Developer Ergonomics 5.2 / 20
Commercial Clarity 3.7 / 20
Operational Transparency 0.7 / 13
Governance 0.0 / 12
Discoverability 7.4 / 10
Agent readiness — 28/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 0 / 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
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/nutshell: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 7

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

Nutshell REST API

Resource-based REST API for managing contacts, leads, accounts, activities, pipelines, and tasks in Nutshell CRM. Authentication uses an API key generated from the Nutshell acco...

Nutshell Legacy JSON-RPC API

Legacy JSON-RPC API for accessing Nutshell CRM data, retained for backward compatibility with existing integrations.

Nutshell Accounts API

The Accounts API from Nutshell — 1 operation(s) for accounts.

Nutshell Activities API

The Activities API from Nutshell — 1 operation(s) for activities.

Nutshell Contacts API

The Contacts API from Nutshell — 1 operation(s) for contacts.

Nutshell Leads API

The Leads API from Nutshell — 1 operation(s) for leads.

Nutshell Pipelines API

The Pipelines API from Nutshell — 1 operation(s) for pipelines.

Scroll for all 7

Open Collections 1

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

Nutshell REST API

OPEN COLLECTION

Security Posture 3

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

Nutshell Authentication

http · 1 scheme

SECURITY

Nutshell Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Nutshell Trust Center

SOC 2, GDPR

SECURITY

Agentic Access 1

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

Nutshell Agentic Access

5 operations

5 operations · 0 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

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
 LlmsText
LlmsText

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 3

Authentication, authorization, and security posture

TrustCenter
TrustCenter
 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

LinkedIn
LinkedIn
 Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: nutshell
name: Nutshell
description: Nutshell is a CRM and email marketing platform for small to mid-sized B2B sales teams, providing pipeline management,
  contact and company records, reporting, automation, and built-in email campaigns. The product unifies sales pipelines, activity
  tracking, and outbound communications in one workspace with mobile and desktop clients. Nutshell exposes a REST API for
  contacts, leads, accounts, activities, and pipelines, plus a legacy JSON-RPC API, both authenticated with an API key.
type: Index
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/nutshell.png
tags:
- CRM
- Sales
- Pipeline Management
- Email Marketing
- Contact Management
- Sales Automation
url: https://raw.githubusercontent.com/api-evangelist/nutshell/refs/heads/main/apis.yml
created: '2026-05-11'
modified: '2026-05-11'
specificationVersion: '0.19'
apis:
- aid: nutshell:rest-api
  name: Nutshell REST API
  description: Resource-based REST API for managing contacts, leads, accounts, activities, pipelines, and tasks in Nutshell
    CRM. Authentication uses an API key generated from the Nutshell account settings.
  humanURL: https://developers.nutshell.com/docs
  baseURL: https://app.nutshell.com/api/v1
  tags:
  - CRM
  - Contacts
  - Leads
  - Accounts
  - Pipelines
  properties:
  - type: Documentation
    url: https://developers.nutshell.com/docs
  - type: DeveloperPortal
    url: https://developers.nutshell.com
  - type: API Keys
    url: https://support.nutshell.com/en/articles/8429060-api-keys-create-api-keys-for-3rd-party-apps
- aid: nutshell:json-rpc
  name: Nutshell Legacy JSON-RPC API
  description: Legacy JSON-RPC API for accessing Nutshell CRM data, retained for backward compatibility with existing integrations.
  humanURL: https://developers-rpc.nutshell.com
  baseURL: https://app.nutshell.com/api/v1/json
  tags:
  - JSON-RPC
  - CRM
  - Legacy
  properties:
  - type: Documentation
    url: https://developers-rpc.nutshell.com
  - type: GitHub SDK
    url: https://github.com/nutshellcrm/nutshell-api-php
- aid: nutshell:nutshell-accounts-api
  name: Nutshell Accounts API
  description: The Accounts API from Nutshell — 1 operation(s) for accounts.
  humanURL: https://developers.nutshell.com/docs
  baseURL: https://app.nutshell.com/api/v1
  tags:
  - Accounts
  properties:
  - type: OpenAPI
    url: openapi/nutshell-accounts-api-openapi.yml
- aid: nutshell:nutshell-activities-api
  name: Nutshell Activities API
  description: The Activities API from Nutshell — 1 operation(s) for activities.
  humanURL: https://developers.nutshell.com/docs
  baseURL: https://app.nutshell.com/api/v1
  tags:
  - Activities
  properties:
  - type: OpenAPI
    url: openapi/nutshell-activities-api-openapi.yml
- aid: nutshell:nutshell-contacts-api
  name: Nutshell Contacts API
  description: The Contacts API from Nutshell — 1 operation(s) for contacts.
  humanURL: https://developers.nutshell.com/docs
  baseURL: https://app.nutshell.com/api/v1
  tags:
  - Contacts
  properties:
  - type: OpenAPI
    url: openapi/nutshell-contacts-api-openapi.yml
- aid: nutshell:nutshell-leads-api
  name: Nutshell Leads API
  description: The Leads API from Nutshell — 1 operation(s) for leads.
  humanURL: https://developers.nutshell.com/docs
  baseURL: https://app.nutshell.com/api/v1
  tags:
  - Leads
  properties:
  - type: OpenAPI
    url: openapi/nutshell-leads-api-openapi.yml
- aid: nutshell:nutshell-pipelines-api
  name: Nutshell Pipelines API
  description: The Pipelines API from Nutshell — 1 operation(s) for pipelines.
  humanURL: https://developers.nutshell.com/docs
  baseURL: https://app.nutshell.com/api/v1
  tags:
  - Pipelines
  properties:
  - type: OpenAPI
    url: openapi/nutshell-pipelines-api-openapi.yml
common:
- type: AgenticAccess
  url: agentic-access/nutshell-agentic-access.yml
- type: TrustCenter
  url: security/nutshell-trust-center.yml
- type: DomainSecurity
  url: security/nutshell-domain-security.yml
- type: Authentication
  url: authentication/nutshell-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/nutshell-llc
- type: Website
  url: https://www.nutshell.com
- type: Documentation
  url: https://developers.nutshell.com
- type: Pricing
  url: https://www.nutshell.com/pricing
- type: Signup
  url: https://www.nutshell.com/start-your-free-trial
- type: Support
  url: https://support.nutshell.com
- type: GitHubOrganization
  url: https://github.com/nutshellcrm
- type: LlmsText
  url: https://developers.nutshell.com/llms.txt
- url: https://www.nutshell.com/feed
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com