Apollo API Documentation website screenshot

Apollo API Documentation

Apollo.io provides a comprehensive REST API for sales intelligence with over 210 million contacts and 35 million companies. The Apollo API enables data enrichment, people and organization search, CRM management, sequences, deals, analytics, and integrations. Authentication is via API keys or OAuth 2.0 for partner integrations. This repository profiles Apollo.io's API documentation as an example of API documentation best practices.

Apollo API Documentation publishes 14 APIs on the APIs.io network, including Accounts API, Contacts API, Email Accounts API, and 11 more. Tagged areas include API Documentation, Best Practices, Data Enrichment, People Search, and Sales Intelligence.

Apollo API Documentation’s developer surface includes engineering blog, documentation, getting-started guide, API reference, authentication, and 6 more developer resources.

🌐 Visit website 📡 Source on GitHub
39.6/100 thin ▬ flat Agent 31/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6
AccessFreemium
14 APIs 8 Features 4 Use Cases
API DocumentationBest PracticesData EnrichmentPeople SearchSales Intelligence

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6
Composite quality — 39.6/100 · thin
Contract Quality 11.0 / 25
Developer Ergonomics 7.8 / 20
Commercial Clarity 9.5 / 20
Operational Transparency 4.8 / 13
Governance 0.0 / 12
Discoverability 6.5 / 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/apollo-api-documentation: 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 14

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

Apollo API Documentation Accounts API

The Accounts API from Apollo API Documentation — 3 operation(s) for accounts.

Apollo API Documentation Contacts API

The Contacts API from Apollo API Documentation — 3 operation(s) for contacts.

Apollo API Documentation Email Accounts API

The Email Accounts API from Apollo API Documentation — 1 operation(s) for email accounts.

Apollo API Documentation Emailer Campaigns API

The Emailer Campaigns API from Apollo API Documentation — 3 operation(s) for emailer campaigns.

Apollo API Documentation Mixed Companies API

The Mixed Companies API from Apollo API Documentation — 1 operation(s) for mixed companies.

Apollo API Documentation Mixed People API

The Mixed People API from Apollo API Documentation — 1 operation(s) for mixed people.

Apollo API Documentation Opportunities API

The Opportunities API from Apollo API Documentation — 3 operation(s) for opportunities.

Apollo API Documentation Organizations API

The Organizations API from Apollo API Documentation — 2 operation(s) for organizations.

Apollo API Documentation People API

The People API from Apollo API Documentation — 2 operation(s) for people.

Apollo API Documentation Phone Calls API

The Phone Calls API from Apollo API Documentation — 3 operation(s) for phone calls.

Apollo API Documentation Sync Report API

The Sync Report API from Apollo API Documentation — 1 operation(s) for sync report.

Apollo API Documentation Tasks API

The Tasks API from Apollo API Documentation — 3 operation(s) for tasks.

Apollo API Documentation Usage Stats API

The Usage Stats API from Apollo API Documentation — 1 operation(s) for usage stats.

Apollo API Documentation Users API

The Users API from Apollo API Documentation — 1 operation(s) for users.

Scroll for all 14

Open Collections 1

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

Apollo.io API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Apollo Api Documentation Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Apollo Api Documentation Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Apollo Api Documentation Finops

FINOPS

Features 8

Notable capabilities this provider offers.

People Enrichment

Enrich contact records with data from Apollo's 210M+ contact database.

Organization Enrichment

Enrich company records with data from Apollo's 35M+ company database.

People Search

Search Apollo's contact database to find and identify sales prospects.

Organization Search

Search Apollo's company database for target accounts and job postings.

CRM Integration

Manage accounts, contacts, deals, and sequences via the REST API.

OAuth 2.0 Partner Integration

Partners use OAuth 2.0 to build integrations accessing Apollo data on behalf of customers.

Interactive Try It

Interactive API testing capability built directly into the documentation.

Analytics Reporting

Query analytics reports for performance metrics via the API.

Scroll for all 8

Security Posture 2

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

Apollo Api Documentation Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Apollo Api Documentation Trust Center

SOC 2, ISO 27001, GDPR

SECURITY

Agentic Access 1

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

Apollo Api Documentation Agentic Access

28 operations · 21 acting

28 operations · 21 acting

AGENTIC

Use Cases 4

What developers build with this provider.

Sales Intelligence

Access Apollo's contact and company database for prospecting and outreach.

Data Enrichment Pipelines

Enrich CRM records with contact and organization data at scale.

Partner Integrations

Build third-party integrations using OAuth 2.0 to access Apollo data for mutual customers.

Workflow Automation

Automate sales workflows including sequences, tasks, and deal management.

Integrations 2

Pre-built integrations with other platforms and tools.

OAuth 2.0

Partner integration protocol for accessing Apollo data on behalf of customers.

API Key Authentication

Direct API key access for customers building internal integrations.

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted
GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

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

RateLimits
RateLimits

Company 1

The organization behind the API

Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: apollo-api-documentation
name: Apollo API Documentation
description: Apollo.io provides a comprehensive REST API for sales intelligence with over 210 million contacts and 35 million
  companies. The Apollo API enables data enrichment, people and organization search, CRM management, sequences, deals, analytics,
  and integrations. Authentication is via API keys or OAuth 2.0 for partner integrations. This repository profiles Apollo.io's
  API documentation as an example of API documentation best practices.
type: Index
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
position: Consumer
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/apollo-api-documentation.png
tags:
- API Documentation
- Best Practices
- Data Enrichment
- People Search
- Sales Intelligence
created: '2025-07-10'
modified: '2026-05-19'
url: https://raw.githubusercontent.com/api-evangelist/apollo-api-documentation/refs/heads/main/apis.yml
specificationVersion: '0.19'
apis:
- aid: apollo-api-documentation:apollo-api-documentation-accounts-api
  name: Apollo API Documentation Accounts API
  description: The Accounts API from Apollo API Documentation — 3 operation(s) for accounts.
  humanURL: https://docs.apollo.io/
  tags:
  - Accounts
  properties:
  - type: OpenAPI
    url: openapi/apollo-api-documentation-accounts-api-openapi.yml
  - type: Documentation
    url: https://docs.apollo.io/
  - type: GettingStarted
    url: https://docs.apollo.io/docs
  - type: APIReference
    url: https://docs.apollo.io/reference
  - type: Authentication
    url: https://docs.apollo.io/reference/authentication
  - type: RateLimits
    url: https://docs.apollo.io/reference/rate-limits
  - type: Tutorials
    url: https://docs.apollo.io/docs/overview-apollo-api-tutorials
  - type: FAQ
    url: https://docs.apollo.io/docs/apollo-api-faqs
- aid: apollo-api-documentation:apollo-api-documentation-contacts-api
  name: Apollo API Documentation Contacts API
  description: The Contacts API from Apollo API Documentation — 3 operation(s) for contacts.
  humanURL: https://docs.apollo.io/
  tags:
  - Contacts
  properties:
  - type: OpenAPI
    url: openapi/apollo-api-documentation-contacts-api-openapi.yml
  - type: Documentation
    url: https://docs.apollo.io/
  - type: GettingStarted
    url: https://docs.apollo.io/docs
  - type: APIReference
    url: https://docs.apollo.io/reference
  - type: Authentication
    url: https://docs.apollo.io/reference/authentication
  - type: RateLimits
    url: https://docs.apollo.io/reference/rate-limits
  - type: Tutorials
    url: https://docs.apollo.io/docs/overview-apollo-api-tutorials
  - type: FAQ
    url: https://docs.apollo.io/docs/apollo-api-faqs
- aid: apollo-api-documentation:apollo-api-documentation-email-accounts-api
  name: Apollo API Documentation Email Accounts API
  description: The Email Accounts API from Apollo API Documentation — 1 operation(s) for email accounts.
  humanURL: https://docs.apollo.io/
  tags:
  - Email Accounts
  properties:
  - type: OpenAPI
    url: openapi/apollo-api-documentation-email-accounts-api-openapi.yml
  - type: Documentation
    url: https://docs.apollo.io/
  - type: GettingStarted
    url: https://docs.apollo.io/docs
  - type: APIReference
    url: https://docs.apollo.io/reference
  - type: Authentication
    url: https://docs.apollo.io/reference/authentication
  - type: RateLimits
    url: https://docs.apollo.io/reference/rate-limits
  - type: Tutorials
    url: https://docs.apollo.io/docs/overview-apollo-api-tutorials
  - type: FAQ
    url: https://docs.apollo.io/docs/apollo-api-faqs
- aid: apollo-api-documentation:apollo-api-documentation-emailer-campaigns-api
  name: Apollo API Documentation Emailer Campaigns API
  description: The Emailer Campaigns API from Apollo API Documentation — 3 operation(s) for emailer campaigns.
  humanURL: https://docs.apollo.io/
  tags:
  - Emailer Campaigns
  properties:
  - type: OpenAPI
    url: openapi/apollo-api-documentation-emailer-campaigns-api-openapi.yml
  - type: Documentation
    url: https://docs.apollo.io/
  - type: GettingStarted
    url: https://docs.apollo.io/docs
  - type: APIReference
    url: https://docs.apollo.io/reference
  - type: Authentication
    url: https://docs.apollo.io/reference/authentication
  - type: RateLimits
    url: https://docs.apollo.io/reference/rate-limits
  - type: Tutorials
    url: https://docs.apollo.io/docs/overview-apollo-api-tutorials
  - type: FAQ
    url: https://docs.apollo.io/docs/apollo-api-faqs
- aid: apollo-api-documentation:apollo-api-documentation-mixed-companies-api
  name: Apollo API Documentation Mixed Companies API
  description: The Mixed Companies API from Apollo API Documentation — 1 operation(s) for mixed companies.
  humanURL: https://docs.apollo.io/
  tags:
  - Mixed Companies
  properties:
  - type: OpenAPI
    url: openapi/apollo-api-documentation-mixed-companies-api-openapi.yml
  - type: Documentation
    url: https://docs.apollo.io/
  - type: GettingStarted
    url: https://docs.apollo.io/docs
  - type: APIReference
    url: https://docs.apollo.io/reference
  - type: Authentication
    url: https://docs.apollo.io/reference/authentication
  - type: RateLimits
    url: https://docs.apollo.io/reference/rate-limits
  - type: Tutorials
    url: https://docs.apollo.io/docs/overview-apollo-api-tutorials
  - type: FAQ
    url: https://docs.apollo.io/docs/apollo-api-faqs
- aid: apollo-api-documentation:apollo-api-documentation-mixed-people-api
  name: Apollo API Documentation Mixed People API
  description: The Mixed People API from Apollo API Documentation — 1 operation(s) for mixed people.
  humanURL: https://docs.apollo.io/
  tags:
  - Mixed People
  properties:
  - type: OpenAPI
    url: openapi/apollo-api-documentation-mixed-people-api-openapi.yml
  - type: Documentation
    url: https://docs.apollo.io/
  - type: GettingStarted
    url: https://docs.apollo.io/docs
  - type: APIReference
    url: https://docs.apollo.io/reference
  - type: Authentication
    url: https://docs.apollo.io/reference/authentication
  - type: RateLimits
    url: https://docs.apollo.io/reference/rate-limits
  - type: Tutorials
    url: https://docs.apollo.io/docs/overview-apollo-api-tutorials
  - type: FAQ
    url: https://docs.apollo.io/docs/apollo-api-faqs
- aid: apollo-api-documentation:apollo-api-documentation-opportunities-api
  name: Apollo API Documentation Opportunities API
  description: The Opportunities API from Apollo API Documentation — 3 operation(s) for opportunities.
  humanURL: https://docs.apollo.io/
  tags:
  - Opportunities
  properties:
  - type: OpenAPI
    url: openapi/apollo-api-documentation-opportunities-api-openapi.yml
  - type: Documentation
    url: https://docs.apollo.io/
  - type: GettingStarted
    url: https://docs.apollo.io/docs
  - type: APIReference
    url: https://docs.apollo.io/reference
  - type: Authentication
    url: https://docs.apollo.io/reference/authentication
  - type: RateLimits
    url: https://docs.apollo.io/reference/rate-limits
  - type: Tutorials
    url: https://docs.apollo.io/docs/overview-apollo-api-tutorials
  - type: FAQ
    url: https://docs.apollo.io/docs/apollo-api-faqs
- aid: apollo-api-documentation:apollo-api-documentation-organizations-api
  name: Apollo API Documentation Organizations API
  description: The Organizations API from Apollo API Documentation — 2 operation(s) for organizations.
  humanURL: https://docs.apollo.io/
  tags:
  - Organizations
  properties:
  - type: OpenAPI
    url: openapi/apollo-api-documentation-organizations-api-openapi.yml
  - type: Documentation
    url: https://docs.apollo.io/
  - type: GettingStarted
    url: https://docs.apollo.io/docs
  - type: APIReference
    url: https://docs.apollo.io/reference
  - type: Authentication
    url: https://docs.apollo.io/reference/authentication
  - type: RateLimits
    url: https://docs.apollo.io/reference/rate-limits
  - type: Tutorials
    url: https://docs.apollo.io/docs/overview-apollo-api-tutorials
  - type: FAQ
    url: https://docs.apollo.io/docs/apollo-api-faqs
- aid: apollo-api-documentation:apollo-api-documentation-people-api
  name: Apollo API Documentation People API
  description: The People API from Apollo API Documentation — 2 operation(s) for people.
  humanURL: https://docs.apollo.io/
  tags:
  - People
  properties:
  - type: OpenAPI
    url: openapi/apollo-api-documentation-people-api-openapi.yml
  - type: Documentation
    url: https://docs.apollo.io/
  - type: GettingStarted
    url: https://docs.apollo.io/docs
  - type: APIReference
    url: https://docs.apollo.io/reference
  - type: Authentication
    url: https://docs.apollo.io/reference/authentication
  - type: RateLimits
    url: https://docs.apollo.io/reference/rate-limits
  - type: Tutorials
    url: https://docs.apollo.io/docs/overview-apollo-api-tutorials
  - type: FAQ
    url: https://docs.apollo.io/docs/apollo-api-faqs
- aid: apollo-api-documentation:apollo-api-documentation-phone-calls-api
  name: Apollo API Documentation Phone Calls API
  description: The Phone Calls API from Apollo API Documentation — 3 operation(s) for phone calls.
  humanURL: https://docs.apollo.io/
  tags:
  - Phone Calls
  properties:
  - type: OpenAPI
    url: openapi/apollo-api-documentation-phone-calls-api-openapi.yml
  - type: Documentation
    url: https://docs.apollo.io/
  - type: GettingStarted
    url: https://docs.apollo.io/docs
  - type: APIReference
    url: https://docs.apollo.io/reference
  - type: Authentication
    url: https://docs.apollo.io/reference/authentication
  - type: RateLimits
    url: https://docs.apollo.io/reference/rate-limits
  - type: Tutorials
    url: https://docs.apollo.io/docs/overview-apollo-api-tutorials
  - type: FAQ
    url: https://docs.apollo.io/docs/apollo-api-faqs
- aid: apollo-api-documentation:apollo-api-documentation-sync-report-api
  name: Apollo API Documentation Sync Report API
  description: The Sync Report API from Apollo API Documentation — 1 operation(s) for sync report.
  humanURL: https://docs.apollo.io/
  tags:
  - Sync Report
  properties:
  - type: OpenAPI
    url: openapi/apollo-api-documentation-sync-report-api-openapi.yml
  - type: Documentation
    url: https://docs.apollo.io/
  - type: GettingStarted
    url: https://docs.apollo.io/docs
  - type: APIReference
    url: https://docs.apollo.io/reference
  - type: Authentication
    url: https://docs.apollo.io/reference/authentication
  - type: RateLimits
    url: https://docs.apollo.io/reference/rate-limits
  - type: Tutorials
    url: https://docs.apollo.io/docs/overview-apollo-api-tutorials
  - type: FAQ
    url: https://docs.apollo.io/docs/apollo-api-faqs
- aid: apollo-api-documentation:apollo-api-documentation-tasks-api
  name: Apollo API Documentation Tasks API
  description: The Tasks API from Apollo API Documentation — 3 operation(s) for tasks.
  humanURL: https://docs.apollo.io/
  tags:
  - Tasks
  properties:
  - type: OpenAPI
    url: openapi/apollo-api-documentation-tasks-api-openapi.yml
  - type: Documentation
    url: https://docs.apollo.io/
  - type: GettingStarted
    url: https://docs.apollo.io/docs
  - type: APIReference
    url: https://docs.apollo.io/reference
  - type: Authentication
    url: https://docs.apollo.io/reference/authentication
  - type: RateLimits
    url: https://docs.apollo.io/reference/rate-limits
  - type: Tutorials
    url: https://docs.apollo.io/docs/overview-apollo-api-tutorials
  - type: FAQ
    url: https://docs.apollo.io/docs/apollo-api-faqs
- aid: apollo-api-documentation:apollo-api-documentation-usage-stats-api
  name: Apollo API Documentation Usage Stats API
  description: The Usage Stats API from Apollo API Documentation — 1 operation(s) for usage stats.
  humanURL: https://docs.apollo.io/
  tags:
  - Usage Stats
  properties:
  - type: OpenAPI
    url: openapi/apollo-api-documentation-usage-stats-api-openapi.yml
  - type: Documentation
    url: https://docs.apollo.io/
  - type: GettingStarted
    url: https://docs.apollo.io/docs
  - type: APIReference
    url: https://docs.apollo.io/reference
  - type: Authentication
    url: https://docs.apollo.io/reference/authentication
  - type: RateLimits
    url: https://docs.apollo.io/reference/rate-limits
  - type: Tutorials
    url: https://docs.apollo.io/docs/overview-apollo-api-tutorials
  - type: FAQ
    url: https://docs.apollo.io/docs/apollo-api-faqs
- aid: apollo-api-documentation:apollo-api-documentation-users-api
  name: Apollo API Documentation Users API
  description: The Users API from Apollo API Documentation — 1 operation(s) for users.
  humanURL: https://docs.apollo.io/
  tags:
  - Users
  properties:
  - type: OpenAPI
    url: openapi/apollo-api-documentation-users-api-openapi.yml
  - type: Documentation
    url: https://docs.apollo.io/
  - type: GettingStarted
    url: https://docs.apollo.io/docs
  - type: APIReference
    url: https://docs.apollo.io/reference
  - type: Authentication
    url: https://docs.apollo.io/reference/authentication
  - type: RateLimits
    url: https://docs.apollo.io/reference/rate-limits
  - type: Tutorials
    url: https://docs.apollo.io/docs/overview-apollo-api-tutorials
  - type: FAQ
    url: https://docs.apollo.io/docs/apollo-api-faqs
common:
- type: AgenticAccess
  url: agentic-access/apollo-api-documentation-agentic-access.yml
- type: TrustCenter
  url: security/apollo-api-documentation-trust-center.yml
- type: DomainSecurity
  url: security/apollo-api-documentation-domain-security.yml
- url: https://www.apollo.io/magazine
  type: Blog
- type: GitHubOrganization
  url: https://github.com/apolloio
- type: Documentation
  url: https://docs.apollo.io/
- type: GettingStarted
  url: https://docs.apollo.io/docs
- type: APIReference
  url: https://docs.apollo.io/reference
- type: Authentication
  url: https://docs.apollo.io/reference/authentication
- type: RateLimits
  url: https://docs.apollo.io/reference/rate-limits
- type: Features
  data:
  - name: People Enrichment
    description: Enrich contact records with data from Apollo's 210M+ contact database.
  - name: Organization Enrichment
    description: Enrich company records with data from Apollo's 35M+ company database.
  - name: People Search
    description: Search Apollo's contact database to find and identify sales prospects.
  - name: Organization Search
    description: Search Apollo's company database for target accounts and job postings.
  - name: CRM Integration
    description: Manage accounts, contacts, deals, and sequences via the REST API.
  - name: OAuth 2.0 Partner Integration
    description: Partners use OAuth 2.0 to build integrations accessing Apollo data on behalf of customers.
  - name: Interactive Try It
    description: Interactive API testing capability built directly into the documentation.
  - name: Analytics Reporting
    description: Query analytics reports for performance metrics via the API.
- type: UseCases
  data:
  - name: Sales Intelligence
    description: Access Apollo's contact and company database for prospecting and outreach.
  - name: Data Enrichment Pipelines
    description: Enrich CRM records with contact and organization data at scale.
  - name: Partner Integrations
    description: Build third-party integrations using OAuth 2.0 to access Apollo data for mutual customers.
  - name: Workflow Automation
    description: Automate sales workflows including sequences, tasks, and deal management.
- type: Integrations
  data:
  - name: OAuth 2.0
    description: Partner integration protocol for accessing Apollo data on behalf of customers.
  - name: API Key Authentication
    description: Direct API key access for customers building internal integrations.
- type: LlmsText
  url: https://docs.apollo.io/llms.txt
maintainers:
- FN: Kin Lane
  email: info@apievangelist.com