Nutshell
Nutshell is a CRM and email-marketing platform for small and mid-sized B2B sales teams, combining pipeline management, contact and company records, activity tracking, reporting, sales automation and built-in outbound email campaigns in one workspace with mobile and desktop clients. For developers Nutshell publishes a documented REST API of 112 operations across 24 resource families at app.nutshell.com/rest, an authenticated GraphQL endpoint, a legacy JSON-RPC API kept alive for existing integrations, an outbound webhook firehose, read-only SQL access on the Enterprise plan, and a remote, OAuth-protected MCP server at app.nutshell.com/mcp that exposes read-only CRM context to AI assistants.
Solid contracts, transparent operations, and an easy start — typically complete on four or five facets with one clear soft spot.
API Evangelist profiles Nutshell the way a machine reads it — 59 machine-readable artifacts across 7 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Nutshell scores 58.5/100 (strong), with a separate agent-readiness read of 34/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-08 · rubric v0.20.0
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How we profile Nutshell
Each block below is one kind of artifact we hold for Nutshell. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 26
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Nutshell Legacy JSON-RPC API
Nutshell's original JSON-RPC API, available since 2010. Nutshell states it is no longer adding new endpoints to this API but continues to support existing customers, making it a...
Nutshell GraphQL API
A GraphQL endpoint served at https://app.nutshell.com/graphql. Nutshell's API authentication guide names GraphQL alongside REST and JSON-RPC as an authenticated surface. Introsp...
Nutshell Activities API
Meetings, calls and logged interactions attached to Nutshell records, plus the activity type reference. 5 operation(s) across 3 path(s).
Nutshell Audiences API
Email-marketing audiences — static lists of contacts used to organize people for marketing sends. 2 operation(s) across 1 path(s).
Nutshell Competitors API
Competitor records and the lead-to-competitor relationships (competitor maps) attached to a lead. 6 operation(s) across 4 path(s).
Nutshell Editions API
Marketing email editions — individual email sends and their metadata. 2 operation(s) across 2 path(s).
Nutshell Emails API
Individual email messages recorded against Nutshell records. 1 operation(s) across 1 path(s).
Nutshell Forms API
Nutshell Forms and their fields, including the field IDs used in each published form. 3 operation(s) across 3 path(s).
Nutshell Industries API
The industry reference list used to classify accounts. 1 operation(s) across 1 path(s).
Nutshell Invoices API
Invoice documents, their status transitions and payment/completion metadata. 3 operation(s) across 3 path(s).
Nutshell Leads API
Sales opportunities: create, read, update, close, reopen, watch, stage and stageset assignment, installments, reports and lead custom fields. 25 operation(s) across 19 path(s).
Nutshell Markets API
Market records used to segment Nutshell data. 2 operation(s) across 2 path(s).
Nutshell Notes API
Free-text notes attached to accounts, contacts and leads, with delete and undelete. 5 operation(s) across 3 path(s).
Nutshell Products API
The product catalog and product maps — instances of a product attached to a lead with quantity and custom pricing. 8 operation(s) across 6 path(s).
Nutshell Quotes API
Quote documents, their status transitions, and creating an invoice from a quote. 4 operation(s) across 4 path(s).
Nutshell Sources API
Lead sources — how leads arrive at your website and learn about your business. 4 operation(s) across 3 path(s).
Nutshell Tags API
Tags used to group leads, contacts and accounts, with delete and undelete. 4 operation(s) across 3 path(s).
Nutshell Tasks API
Tasks assigned to Nutshell users, including assignee updates. 5 operation(s) across 2 path(s).
Nutshell Territories API
Sales territories used to scope ownership of Nutshell records. 1 operation(s) across 1 path(s).
Nutshell Users API
Nutshell users in the instance. 2 operation(s) across 2 path(s).
Nutshell Accounts (Companies) API
The Accounts (Companies) API from Nutshell — 10 operation(s) for accounts (companies).
Nutshell Contacts (People) API
The Contacts (People) API from Nutshell — 8 operation(s) for contacts (people).
Nutshell Events (Timeline) API
The Events (Timeline) API from Nutshell — 2 operation(s) for events (timeline).
Nutshell Filter API
The Filter API from Nutshell — 1 operation(s) for filter.
Nutshell Product Categories API
The ProductCategories API from Nutshell — 2 operation(s) for productcategories.
Nutshell Stagesets (Pipelines) API
The Stagesets (Pipelines) API from Nutshell — 3 operation(s) for stagesets (pipelines).
Scroll within the panel for all 26 ·
Open Collections 24
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Nutshell Accounts (Companies) API
OPEN COLLECTIONNutshell Activities API
OPEN COLLECTIONNutshell Audiences API
OPEN COLLECTIONNutshell Competitors API
OPEN COLLECTIONNutshell Contacts (People) API
OPEN COLLECTIONNutshell Editions API
OPEN COLLECTIONNutshell Emails API
OPEN COLLECTIONNutshell Events (Timeline) API
OPEN COLLECTIONNutshell Filter API
OPEN COLLECTIONNutshell Forms API
OPEN COLLECTIONNutshell Industries API
OPEN COLLECTIONNutshell Invoices API
OPEN COLLECTIONNutshell Leads API
OPEN COLLECTIONNutshell Markets API
OPEN COLLECTIONNutshell Notes API
OPEN COLLECTIONNutshell Stagesets (Pipelines) API
OPEN COLLECTIONNutshell ProductCategories API
OPEN COLLECTIONNutshell Products API
OPEN COLLECTIONNutshell Quotes API
OPEN COLLECTIONNutshell Sources API
OPEN COLLECTIONNutshell Tags API
OPEN COLLECTIONNutshell Tasks API
OPEN COLLECTIONNutshell Territories API
OPEN COLLECTIONNutshell Users API
OPEN COLLECTIONScroll within the panel for all 24 ·
MCP Servers 1
Model Context Protocol servers expose these APIs directly to AI agents. We profile them because agent-native access is the fastest-growing way this provider's capabilities actually get used.
Model Context Protocol servers that expose these APIs to AI agents.
Nutshell MCP server
MCP SERVERPricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Nutshell Rate Limits
RATE LIMITSEvent Specifications 1
Not every API is request/response. AsyncAPI describes the event-driven and streaming side — the webhooks and channels — so the asynchronous half of the interface is documented the same way the synchronous half is.
AsyncAPI definitions for this provider's event-driven and streaming APIs.
Nutshell Webhooks
ASYNCAPISecurity Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Scopes 1
OAuth scopes are the vocabulary of least-privilege access. Profiling them shows exactly what an integration — or an agent acting on a user's behalf — is allowed to do.
OAuth scopes governing access to this provider's APIs.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Nutshell — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 6
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 6
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 7
Pagination, idempotency, versioning, errors, and events
Scroll within the panel for all 7 ·
Build 4
SDKs, sample code, and the tooling you integrate with
Access & Security 5
Authentication, authorization, and security posture
Operate 5
Status, limits, changes, and where to get help
Commercial 4
Pricing, plans, and the legal terms of use
Company 4
The organization behind the API
Other 6
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/nutshell · machine-readable index on apis.io
This is an independent, third-party profile of Nutshell, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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