Affinity

Affinity is a relationship intelligence CRM built for private equity, venture capital, and investment banking teams. It provides a REST API that enables developers to manage contacts, organizations, opportunities, lists, notes, and relationship timelines derived from email and calendar activity. The API is available in two versions: a legacy V1 with full read/write capabilities for persons, companies, opportunities, notes, interactions, reminders, and webhooks, and a modern V2 RESTful interface designed for internal apps, automated workflows, and third-party integrations. API access is included in the Scale, Advanced, and Enterprise subscription tiers, with monthly call limits ranging from 100,000 to unlimited depending on the plan.

Affinity publishes 10 APIs on the APIs.io network, including auth API, companies API, companyMerges API, and 7 more. Tagged areas include CRM, Relationship Intelligence, Private Equity, Venture Capital, and Contacts.

The Affinity catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Affinity’s developer surface includes authentication, documentation, engineering blog, pricing, and 13 more developer resources.

🌐 Visit website 📡 Source on GitHub

50.9/100 developing ▼ -6.9 Agent 31/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6

AccessPaidSelf serve

11 APIs

CRMRelationship IntelligencePrivate EquityVenture CapitalContactsOrganizationsOpportunitiesDeal Management

Kin Score

Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6

Composite quality — 50.9/100 · developing

Contract Quality 12.5 / 25

Developer Ergonomics 4.3 / 20

Commercial Clarity 11.6 / 20

Operational Transparency 6.8 / 13

Governance 8.3 / 12

Discoverability 7.4 / 10

Agent readiness — 31/100 · 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 7 / 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/affinity: 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 11

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

Rate Limits 1

Documented rate limits and quota policies.

Affinity Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

JSON Schema 14

Standalone JSON Schema definitions for this provider's data models.

Scroll for all 14

Examples 1

Example request and response payloads for these APIs.

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Vocabulary

Vocabulary

JSONLDContext

JSONLDContext

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrg

GitHubOrg

Access & Security 3

Authentication, authorization, and security posture

TrustCenter

TrustCenter

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

StatusPage

StatusPage

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Source (apis.yml)

name: Affinity
description: 'Affinity is a relationship intelligence CRM built for private equity, venture capital, and investment banking
  teams. It provides a REST API that enables developers to manage contacts, organizations, opportunities, lists, notes, and
  relationship timelines derived from email and calendar activity. The API is available in two versions: a legacy V1 with
  full read/write capabilities for persons, companies, opportunities, notes, interactions, reminders, and webhooks, and a
  modern V2 RESTful interface designed for internal apps, automated workflows, and third-party integrations. API access is
  included in the Scale, Advanced, and Enterprise subscription tiers, with monthly call limits ranging from 100,000 to unlimited
  depending on the plan.'
accessModel:
  pricing: paid
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Paid · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/affinity.png
url: https://raw.githubusercontent.com/api-evangelist/affinity/refs/heads/main/apis.yml
created: '2026-06-12'
modified: '2026-06-12'
specificationVersion: '0.19'
type: Index
tags:
- CRM
- Relationship Intelligence
- Private Equity
- Venture Capital
- Contacts
- Organizations
- Opportunities
- Deal Management
apis:
- name: Affinity API V1
  description: The legacy Affinity V1 API provides comprehensive read and write access to core CRM data including persons,
    organizations, opportunities, lists, notes, interactions, reminders, and webhooks. It uses HTTP Basic Auth or Bearer Auth
    with an API key obtained from the Affinity Settings dashboard.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://api-docs.affinity.co/
  baseURL: https://api.affinity.co
  tags:
  - CRM
  - Contacts
  - Organizations
  - Opportunities
  - Notes
  - Webhooks
  properties:
  - type: Documentation
    url: https://api-docs.affinity.co/
- aid: affinity:affinity-auth-api
  name: Affinity auth API
  description: Operations about auths
  humanURL: https://api-docs.affinity.co/
  baseURL: https://api.affinity.co
  tags:
  - auth
  properties:
  - type: OpenAPI
    url: openapi/affinity-auth-api-openapi.yml
  - type: Documentation
    url: https://developer.affinity.co/
- aid: affinity:affinity-companies-api
  name: Affinity companies API
  description: Operations about companies
  humanURL: https://api-docs.affinity.co/
  baseURL: https://api.affinity.co
  tags:
  - companies
  properties:
  - type: OpenAPI
    url: openapi/affinity-companies-api-openapi.yml
  - type: Documentation
    url: https://developer.affinity.co/
- aid: affinity:affinity-companymerges-api
  name: Affinity companyMerges API
  description: Operations about company merges
  humanURL: https://api-docs.affinity.co/
  baseURL: https://api.affinity.co
  tags:
  - companyMerges
  properties:
  - type: OpenAPI
    url: openapi/affinity-companymerges-api-openapi.yml
  - type: Documentation
    url: https://developer.affinity.co/
- aid: affinity:affinity-emails-api
  name: Affinity emails API
  description: Operations about emails
  humanURL: https://api-docs.affinity.co/
  baseURL: https://api.affinity.co
  tags:
  - emails
  properties:
  - type: OpenAPI
    url: openapi/affinity-emails-api-openapi.yml
  - type: Documentation
    url: https://developer.affinity.co/
- aid: affinity:affinity-lists-api
  name: Affinity lists API
  description: Operations about lists
  humanURL: https://api-docs.affinity.co/
  baseURL: https://api.affinity.co
  tags:
  - lists
  properties:
  - type: OpenAPI
    url: openapi/affinity-lists-api-openapi.yml
  - type: Documentation
    url: https://developer.affinity.co/
- aid: affinity:affinity-meetings-api
  name: Affinity meetings API
  description: Operations about meetings
  humanURL: https://api-docs.affinity.co/
  baseURL: https://api.affinity.co
  tags:
  - meetings
  properties:
  - type: OpenAPI
    url: openapi/affinity-meetings-api-openapi.yml
  - type: Documentation
    url: https://developer.affinity.co/
- aid: affinity:affinity-notes-api
  name: Affinity notes API
  description: Operations about notes
  humanURL: https://api-docs.affinity.co/
  baseURL: https://api.affinity.co
  tags:
  - notes
  properties:
  - type: OpenAPI
    url: openapi/affinity-notes-api-openapi.yml
  - type: Documentation
    url: https://developer.affinity.co/
- aid: affinity:affinity-opportunities-api
  name: Affinity opportunities API
  description: Operations about opportunities
  humanURL: https://api-docs.affinity.co/
  baseURL: https://api.affinity.co
  tags:
  - opportunities
  properties:
  - type: OpenAPI
    url: openapi/affinity-opportunities-api-openapi.yml
  - type: Documentation
    url: https://developer.affinity.co/
- aid: affinity:affinity-personmerges-api
  name: Affinity personMerges API
  description: Operations about person merges
  humanURL: https://api-docs.affinity.co/
  baseURL: https://api.affinity.co
  tags:
  - personMerges
  properties:
  - type: OpenAPI
    url: openapi/affinity-personmerges-api-openapi.yml
  - type: Documentation
    url: https://developer.affinity.co/
- aid: affinity:affinity-persons-api
  name: Affinity persons API
  description: Operations about persons
  humanURL: https://api-docs.affinity.co/
  baseURL: https://api.affinity.co
  tags:
  - persons
  properties:
  - type: OpenAPI
    url: openapi/affinity-persons-api-openapi.yml
  - type: Documentation
    url: https://developer.affinity.co/
common:
- type: AgenticAccess
  url: agentic-access/affinity-agentic-access.yml
- type: TrustCenter
  url: security/affinity-trust-center.yml
- type: DomainSecurity
  url: security/affinity-domain-security.yml
- type: Authentication
  url: authentication/affinity-authentication.yml
- type: Website
  url: https://www.affinity.co/
- type: Documentation
  url: https://developer.affinity.co/
- type: GitHubOrg
  url: https://github.com/affinity
- type: LinkedIn
  url: https://www.linkedin.com/company/project-affinity
- type: Blog
  url: https://www.affinity.co/resources/blog
- type: Pricing
  url: https://www.affinity.co/product/affinity-pricing
- type: StatusPage
  url: https://status.affinity.co/
- type: X
  url: https://x.com/affinity
- type: Plans
  url: plans/affinity-plans-pricing.yml
- type: RateLimits
  url: rate-limits/affinity-rate-limits.yml
- type: FinOps
  url: finops/affinity-finops.yml
- type: Vocabulary
  url: vocabulary/affinity-vocabulary.yml
- type: JSONLDContext
  url: json-ld/affinity-context.jsonld
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
aid: affinity