Zendesk Sell

Zendesk Sell (formerly Base CRM) is a sales CRM platform that helps sales teams manage leads, contacts, deals, and pipelines while integrating with the broader Zendesk customer experience suite. The platform offers pipeline analytics, email and call tracking, mobile apps, and territory management for high-velocity sales organizations. The Sell API is a RESTful API authenticated via OAuth 2.0 (authorization code, implicit, password, and refresh token grants) at the api.getbase.com host that provides full CRUD access to leads, contacts, deals, accounts, notes, tasks, calls, and custom fields, alongside a premium Sync API, a client-pulled Firehose change stream and a Search API. Zendesk announced on 2025-09-09 that Sell is being retired on 2027-08-31 and is no longer sold as a standalone plan, so the API carries a hard end date.

Zendesk Sell publishes 4 API contracts indexed on the APIs.io network, including (Sales CRM) API, Contacts API, Deals API, and 1 more. Tagged areas include CRM, Sales, Sales Automation, Leads, and Deals.

The Zendesk Sell catalog on APIs.io includes 1 Spectral governance ruleset.

Zendesk Sell’s developer surface includes authentication, documentation, API reference, pricing, signup flow, support, getting-started guide, and 34 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

70.1/100 exemplar ▬ flat Agent 30/100 agent ready saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessPaidApproval

1 published contract 3 Agent Skills

CRM Sales Sales Automation Leads Deals Pipelines Customer Experience

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

DealsLeads

POST /v2/deals GET /v2/leads POST /v2/leads

Customer Relationship Management

BC-420

Contacts

POST /v2/contacts POST /v2/contacts/upsert

Kin Score

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

Composite quality — 70.1/100 · exemplar

Contract Quality 9.1 / 19

Developer Ergonomics 11.2 / 15

Access Clarity 14.0 / 15

Operational Transparency 7.2 / 10

Contract Governance 1.6 / 9

Discoverability 5.0 / 8

Regulatory Posture 6.8 / 15

Create-or-Update Ergonomics 2.2 / 10

Agent readiness — 30/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 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 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 6 / 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 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):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
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)
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
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks

6 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 48.7 — up to +12.8 composite points
Contract Governance scores 18.2 — up to +9.8 composite points
Developer Ergonomics scores 74.4 — up to +5.1 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/zendesk-sell/apis.yml: open an issue on github.com/api-evangelist/zendesk-sell 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 3

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)

Postman Collections

measured — observed by APIs.io (published)

OAuth 2.0

measured — observed by APIs.io (declared)

APIs 4

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

Zendesk Sell (Sales CRM) API

OAuth 2.0-authenticated REST API for managing leads, contacts, deals, accounts, notes, tasks, calls, sources, stages, pipelines, and custom fields in Zendesk Sell. Bearer access...

Zendesk Sell Contacts API

Individual people and organizations.

Zendesk Sell Deals API

Sales opportunities moving through pipeline stages.

Zendesk Sell Leads API

Pre-qualified sales prospects.

Open Collections 4

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

Zendesk Sell (Sales CRM) Contacts API

OPEN COLLECTION

Zendesk Sell (Sales CRM) Contacts Deals API

OPEN COLLECTION

Zendesk Sell (Sales CRM) Contacts Leads API

OPEN COLLECTION

Zendesk Sell (Sales CRM) API

OPEN COLLECTION

Agent Skills 3

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

Capture and qualify a Zendesk Sell lead

AGENT SKILL

Move a Zendesk Sell deal through the pipeline

AGENT SKILL

Mirror Zendesk Sell records into a local store

AGENT SKILL

Zendesk Sell API pricing

Prices published by Zendesk Sell, read 2026-10-28 from www.zendesk.com/pricing/.

Plan	Price
Support Team	$19 agent/month paid yearly Includes: 5 ARs per agent/month; 10 GB + 50 MB/agent data storage; Up to 40K actions/month
Support Team (monthly)	$25 per agent/month
Suite Team	$55 agent/month paid yearly Includes: 5 ARs per agent/month; Up to 40K actions/month
Suite Team (monthly)	$69 per agent/month
Suite Professional	$115 agent/month paid yearly Includes: 10 ARs per agent/month; Up to 100K actions/month
Suite Professional (monthly)	$149 per agent/month
Suite Enterprise + Copilot	Talk to Sales
Copilot add-on	$50 agent/month paid yearly

All 11 plans, limits and sources →

Rate limits

Sell Core API per-token limit: 36000 1h

Rate-limit details →

Billed by: agent/month paid yearly · FinOps profile →

Pricing Plans 2

Published pricing tiers and plan structures.

Zendesk Sell Plans Pricing

11 plans

PLANS

Zendesk Sell Price Estimates

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Zendesk Sell Rate Limits

1 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Zendesk Sell

SLA

FinOps 1

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

Zendesk Sell Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Zendesk Sell API Rules

54 rules · 52 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.

Zendesk Sell Contacts Api Overlay

11 actions · update · zendesk-sell-contacts-api-openapi.yml

DERIVED

Zendesk Sell Deals Api Overlay

11 actions · update · zendesk-sell-deals-api-openapi.yml

DERIVED

Zendesk Sell Leads Api Overlay

11 actions · update · zendesk-sell-leads-api-openapi.yml

DERIVED

Security Posture 4

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

Zendesk Sell Authentication

oauth2 · 1 scheme

SECURITY

Zendesk Sell Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Zendesk Sell Vulnerability Disclosure

Bugcrowd · security.txt · contact published

SECURITY

Zendesk Sell Trust Center

SOC 2 Type II, ISO 27001, ISO 27018, ISO 27701, CSA STAR, FedRAMP, HIPAA, GDPR, C5

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Zendesk Sell Scopes

3 scopes · authorizationCode/implicit/password

3 scopes

SCOPES

Agentic Access 1

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

Zendesk Sell Agentic Access

18 operations · 12 acting

AGENTIC

Resources

Get Started 4

Portal, sign-up, and the first successful call

Signup

Signup

Login

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

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

AgenticAccess

WellKnown

WellKnown

X-MCPServerCandidate

X-MCPServerCandidate

LLMsTxt

LLMsTxt

AgentSkill

AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conformance

ErrorCatalog

Lifecycle

Conventions

DataModel

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

SDKs

CLI

Access & Security 8

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

Authentication

OAuthScopes

SecurityTxt

Compliance

TrustCenter

Security

Scroll for all 8

Operate 5

Status, limits, changes, and where to get help

Support

StatusPage

Deprecation

ChangeLog

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

PrivacyPolicy

Plans

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

EventTypes

EventTypes

Source (apis.yml)

aid: zendesk-sell
name: Zendesk Sell
description: Zendesk Sell (formerly Base CRM) is a sales CRM platform that helps sales teams manage leads, contacts, deals,
  and pipelines while integrating with the broader Zendesk customer experience suite. The platform offers pipeline analytics,
  email and call tracking, mobile apps, and territory management for high-velocity sales organizations. The Sell API is a
  RESTful API authenticated via OAuth 2.0 (authorization code, implicit, password, and refresh token grants) at the api.getbase.com
  host that provides full CRUD access to leads, contacts, deals, accounts, notes, tasks, calls, and custom fields, alongside
  a premium Sync API, a client-pulled Firehose change stream and a Search API. Zendesk announced on 2025-09-09 that Sell is
  being retired on 2027-08-31 and is no longer sold as a standalone plan, so the API carries a hard end date.
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: paid
  onboarding: approval
  trial: false
  try_now: false
  public: false
  label: Paid · Requires approval
  confidence: high
  source:
  - plans
  - authentication
  - scopes
  - rate-limits
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/zendesk-sell.png
tags:
- CRM
- Sales
- Sales Automation
- Leads
- Deals
- Pipelines
- Customer Experience
tags_raw:
- CRM
- Sales
- Sales Automation
- Leads
- Deals
- Pipeline
- Customer Experience
url: https://raw.githubusercontent.com/api-evangelist/zendesk-sell/refs/heads/main/apis.yml
created: '2026-05-11'
modified: '2026-08-13'
specificationVersion: '0.23'
apis:
- aid: zendesk-sell:sales-crm-api
  name: Zendesk Sell (Sales CRM) API
  description: OAuth 2.0-authenticated REST API for managing leads, contacts, deals, accounts, notes, tasks, calls, sources,
    stages, pipelines, and custom fields in Zendesk Sell. Bearer access tokens are passed in the Authorization header against
    the api.getbase.com host.
  humanURL: https://developer.zendesk.com/api-reference/sales-crm/introduction/
  baseURL: https://api.getbase.com
  tags:
  - CRM
  - Sales
  - Leads
  - Contacts
  - Deals
  - Pipelines
  tags_raw:
  - CRM
  - Sales
  - Leads
  - Contacts
  - Deals
  - Pipeline
  properties:
  - type: Documentation
    url: https://developer.zendesk.com/api-reference/sales-crm/introduction/
  - type: Authentication
    url: https://developer.zendesk.com/api-reference/sales-crm/authentication/introduction/
  - type: OAuth Reference
    url: https://developer.zendesk.com/api-reference/sales-crm/authentication/reference/
  - type: RateLimits
    url: https://developer.zendesk.com/api-reference/sales-crm/rate-limits/
  - type: Errors
    url: https://developer.zendesk.com/api-reference/sales-crm/errors/
  - type: PostmanCollection
    url: collections/zendesk-sell.postman_collection.json
- aid: zendesk-sell:zendesk-sell-contacts-api
  name: Zendesk Sell Contacts API
  description: Individual people and organizations.
  humanURL: https://developer.zendesk.com/api-reference/sales-crm/introduction/
  baseURL: https://api.getbase.com
  tags:
  - Contacts
  properties:
  - type: OpenAPI
    url: openapi/zendesk-sell-contacts-api-openapi.yml
  - type: Overlay
    url: overlays/zendesk-sell-contacts-api-overlay.yaml
  - type: PostmanCollection
    url: collections/zendesk-sell-contacts-api.postman_collection.json
- aid: zendesk-sell:zendesk-sell-deals-api
  name: Zendesk Sell Deals API
  description: Sales opportunities moving through pipeline stages.
  humanURL: https://developer.zendesk.com/api-reference/sales-crm/introduction/
  baseURL: https://api.getbase.com
  tags:
  - Deals
  properties:
  - type: OpenAPI
    url: openapi/zendesk-sell-deals-api-openapi.yml
  - type: Overlay
    url: overlays/zendesk-sell-deals-api-overlay.yaml
  - type: PostmanCollection
    url: collections/zendesk-sell-deals-api.postman_collection.json
- aid: zendesk-sell:zendesk-sell-leads-api
  name: Zendesk Sell Leads API
  description: Pre-qualified sales prospects.
  humanURL: https://developer.zendesk.com/api-reference/sales-crm/introduction/
  baseURL: https://api.getbase.com
  tags:
  - Leads
  properties:
  - type: OpenAPI
    url: openapi/zendesk-sell-leads-api-openapi.yml
  - type: Overlay
    url: overlays/zendesk-sell-leads-api-overlay.yaml
  - type: PostmanCollection
    url: collections/zendesk-sell-leads-api.postman_collection.json
common:
- type: CapabilityMap
  url: capabilities/zendesk-sell-capability-edges.yml
  name: Zendesk Sell Business Capability Map
- type: AgenticAccess
  url: agentic-access/zendesk-sell-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/zendesk-sell-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/zendesk-sell-domain-security.yml
- type: Authentication
  url: authentication/zendesk-sell-authentication.yml
- type: OAuthScopes
  url: scopes/zendesk-sell-scopes.yml
- type: Website
  url: https://www.zendesk.com/sell/
- type: Documentation
  url: https://developer.zendesk.com/api-reference/sales-crm/introduction/
- type: APIReference
  url: https://developer.zendesk.com/api-reference/
- type: Pricing
  url: https://www.zendesk.com/pricing/
- type: Signup
  url: https://www.zendesk.com/register/
- type: Login
  url: https://www.zendesk.com/login/
- type: Support
  url: https://support.zendesk.com/
- type: GitHubOrganization
  url: https://github.com/zendesk
- type: DeveloperPortal
  url: https://developer.zendesk.com/
- type: GettingStarted
  url: https://developer.zendesk.com/documentation/sales-crm/first-call/
- type: Blog
  url: https://www.zendesk.com/blog/
- type: TermsOfService
  url: https://www.zendesk.com/company/agreements-and-terms/zendesk-customer-agreement/
- type: PrivacyPolicy
  url: https://www.zendesk.com/company/agreements-and-terms/privacy-notice/
- type: Packages
  url: packages/zendesk-sell-packages.yml
- type: SDKs
  url: packages/zendesk-sell-packages.yml
- type: WellKnown
  url: well-known/zendesk-sell-well-known.yml
- type: SecurityTxt
  url: well-known/zendesk-sell-security.txt
- type: X-MCPServerCandidate
  url: mcp/zendesk-sell-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: LLMsTxt
  url: llms/zendesk-sell-llms.txt
- type: Conformance
  url: conformance/zendesk-sell-conformance.yml
- type: Compliance
  url: https://www.zendesk.com/trust-center/
- type: TrustCenter
  url: security/zendesk-sell-trust-center.yml
- type: Security
  url: https://www.zendesk.com/company/policies-and-guidelines/responsible-disclosure-policy/
- type: ErrorCatalog
  url: errors/zendesk-sell-problem-types.yml
- type: Lifecycle
  url: lifecycle/zendesk-sell-lifecycle.yml
- type: StatusPage
  url: https://status.zendesk.com/
- type: Deprecation
  url: https://support.zendesk.com/hc/en-us/articles/9591462550042-Announcing-the-retiring-of-Zendesk-Sell
- type: Conventions
  url: conventions/zendesk-sell-conventions.yml
- type: ChangeLog
  url: changelog/zendesk-sell-changelog.yml
- type: CLI
  url: cli/zendesk-sell-cli.yml
- type: DataModel
  url: data-model/zendesk-sell-data-model.yml
- type: RateLimits
  url: rate-limits/zendesk-sell-rate-limits.yml
- type: Plans
  url: plans/zendesk-sell-plans-pricing.yml
- type: EventTypes
  url: events/zendesk-sell-events.yml
- type: AgentSkill
  url: skills/_index.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-enrichment:
  date: '2026-08-13'
  status: enriched
  artifacts_added: 23
  pass: local-v1
x-parent: zendesk
x-relationship: product

Zendesk Sell API — frequently asked questions

Does Zendesk Sell have an API?

Yes. APIs.io lists 4 APIs from Zendesk Sell, including Zendesk Sell (Sales CRM) API, Zendesk Sell Contacts API and Zendesk Sell Deals API, and 1 more.

Is there an OpenAPI specification for the Zendesk Sell API?

Yes. APIs.io indexes 3 OpenAPI specifications for Zendesk Sell, each linked for download from this page.

How do I authenticate with the Zendesk Sell API?

Zendesk Sell documents its authentication (oauth2 · 1 scheme). The details are profiled on APIs.io as Zendesk Sell Authentication.

How much does the Zendesk Sell API cost?

Zendesk Sell publishes its prices; its Support Team plan is $19 agent/month paid yearly as of 2026-10-28. APIs.io lists 11 pricing plans for Zendesk Sell, with each plan's price, limits and inclusions under Pricing on this page.

Is the Zendesk Sell API ready for AI agents?

Zendesk Sell has a Kin Score of 70.1 out of 100 (exemplar) and an Agent Readiness score of 30.1 (agent-ready), scored by API Evangelist on 2026-11-06.

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