Apollo.io

Apollo.io is a sales intelligence and engagement platform built on a B2B database of hundreds of millions of contacts and companies. Its REST API exposes People Enrichment (single and bulk match), People Search, Organization Enrichment and Search, Contacts and Accounts management, and Sequences (emailer campaigns) for outreach - covering contact discovery, data enrichment, prospecting, and sales intelligence use cases. The API is authenticated with an x-api-key header and is gated behind Apollo's paid plans (API access begins on the Professional tier; some endpoints require a master API key).

Apollo.io publishes 7 APIs on the APIs.io network, including Accounts API, Contacts API, Organization Enrichment API, and 4 more. Tagged areas include Contact Discovery, Data Enrichment, Sales Intelligence, B2B Data, and Prospecting.

Apollo.io’s developer surface includes authentication, documentation, pricing, engineering blog, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub

40.7/100 developing ▬ flat Agent 22/100 agent aware Full breakdown ↓
scored 2026-08-24 · rubric v0.13.0

AccessFreemiumSelf serve⚡ Free to try

7 APIs

Contact Discovery Data Enrichment Sales Intelligence B2B Data Prospecting Web Intelligence Lead Generation People Search

Kin Score

Kin Score How this is scored →
scored 2026-08-24 · rubric v0.13.0

Composite quality — 40.7/100 · developing

Contract Quality 14.1 / 25

Developer Ergonomics 4.8 / 20

Access Clarity 10.0 / 20

Operational Transparency 4.4 / 13

Contract Governance 0.0 / 12

Discoverability 7.4 / 10

Agent readiness — 22/100 · agent aware

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 0 / 8

Request/Response Examples 7 / 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-enrich: 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.

Rate Limits 1

Documented rate limits and quota policies.

Apollo Enrich Rate Limits

6 limits

RATE LIMITS

FinOps 1

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

Get Started 1

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

Pricing

Pricing

FinOps

FinOps

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Source (apis.yml)

aid: apollo-enrich
url: https://raw.githubusercontent.com/api-evangelist/apollo-enrich/refs/heads/main/apis.yml
name: Apollo.io
kind: company
description: Apollo.io is a sales intelligence and engagement platform built on a B2B database of hundreds of millions of
  contacts and companies. Its REST API exposes People Enrichment (single and bulk match), People Search, Organization Enrichment
  and Search, Contacts and Accounts management, and Sequences (emailer campaigns) for outreach - covering contact discovery,
  data enrichment, prospecting, and sales intelligence use cases. The API is authenticated with an x-api-key header and is
  gated behind Apollo's paid plans (API access begins on the Professional tier; some endpoints require a master API key).
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · 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/apollo-enrich.png
tags:
- Contact Discovery
- Data Enrichment
- Sales Intelligence
- B2B Data
- Prospecting
- Web Intelligence
- Lead Generation
- People Search
created: '2026-07-11'
modified: '2026-07-11'
specificationVersion: '0.23'
apis:
- aid: apollo-enrich:apollo-enrich-accounts-api
  name: Apollo.io Accounts API
  description: Manage accounts (companies) saved to your Apollo team.
  humanURL: https://docs.apollo.io/reference/people-enrichment
  baseURL: https://api.apollo.io/api/v1
  tags:
  - Account
  tags_raw:
  - Accounts
  properties:
  - type: OpenAPI
    url: openapi/apollo-enrich-accounts-api-openapi.yml
  - type: Documentation
    url: https://docs.apollo.io/docs/enrich-people-data
  - type: APIReference
    url: https://docs.apollo.io/reference/people-enrichment
  - type: PostmanCollection
    url: collections/apollo-enrich.postman_collection.json
  - type: OpenCollection
    url: collections/apollo-enrich.opencollection.json
  - type: Documentation
    url: https://docs.apollo.io/docs/find-people-using-filters
  - type: APIReference
    url: https://docs.apollo.io/reference/people-api-search
  - type: APIReference
    url: https://docs.apollo.io/reference/organization-enrichment
  - type: APIReference
    url: https://docs.apollo.io/reference/organization-search
  - type: APIReference
    url: https://docs.apollo.io/reference/search-for-contacts
  - type: APIReference
    url: https://docs.apollo.io/reference/search-for-accounts
  - type: APIReference
    url: https://docs.apollo.io/reference/add-contacts-to-sequence
- aid: apollo-enrich:apollo-enrich-contacts-api
  name: Apollo.io Contacts API
  description: Manage contacts saved in your Apollo account.
  humanURL: https://docs.apollo.io/reference/people-enrichment
  baseURL: https://api.apollo.io/api/v1
  tags:
  - Contacts
  properties:
  - type: OpenAPI
    url: openapi/apollo-enrich-contacts-api-openapi.yml
  - type: Documentation
    url: https://docs.apollo.io/docs/enrich-people-data
  - type: APIReference
    url: https://docs.apollo.io/reference/people-enrichment
  - type: PostmanCollection
    url: collections/apollo-enrich.postman_collection.json
  - type: OpenCollection
    url: collections/apollo-enrich.opencollection.json
  - type: Documentation
    url: https://docs.apollo.io/docs/find-people-using-filters
  - type: APIReference
    url: https://docs.apollo.io/reference/people-api-search
  - type: APIReference
    url: https://docs.apollo.io/reference/organization-enrichment
  - type: APIReference
    url: https://docs.apollo.io/reference/organization-search
  - type: APIReference
    url: https://docs.apollo.io/reference/search-for-contacts
  - type: APIReference
    url: https://docs.apollo.io/reference/search-for-accounts
  - type: APIReference
    url: https://docs.apollo.io/reference/add-contacts-to-sequence
- aid: apollo-enrich:apollo-enrich-organization-enrichment-api
  name: Apollo.io Organization Enrichment API
  description: Match and enrich company records, single or in bulk.
  humanURL: https://docs.apollo.io/reference/people-enrichment
  baseURL: https://api.apollo.io/api/v1
  tags:
  - Organization Enrichment
  properties:
  - type: OpenAPI
    url: openapi/apollo-enrich-organization-enrichment-api-openapi.yml
  - type: Documentation
    url: https://docs.apollo.io/docs/enrich-people-data
  - type: APIReference
    url: https://docs.apollo.io/reference/people-enrichment
  - type: PostmanCollection
    url: collections/apollo-enrich.postman_collection.json
  - type: OpenCollection
    url: collections/apollo-enrich.opencollection.json
  - type: Documentation
    url: https://docs.apollo.io/docs/find-people-using-filters
  - type: APIReference
    url: https://docs.apollo.io/reference/people-api-search
  - type: APIReference
    url: https://docs.apollo.io/reference/organization-enrichment
  - type: APIReference
    url: https://docs.apollo.io/reference/organization-search
  - type: APIReference
    url: https://docs.apollo.io/reference/search-for-contacts
  - type: APIReference
    url: https://docs.apollo.io/reference/search-for-accounts
  - type: APIReference
    url: https://docs.apollo.io/reference/add-contacts-to-sequence
- aid: apollo-enrich:apollo-enrich-organization-search-api
  name: Apollo.io Organization Search API
  description: Search Apollo's company database.
  humanURL: https://docs.apollo.io/reference/people-enrichment
  baseURL: https://api.apollo.io/api/v1
  tags:
  - Organization Search
  properties:
  - type: OpenAPI
    url: openapi/apollo-enrich-organization-search-api-openapi.yml
  - type: Documentation
    url: https://docs.apollo.io/docs/enrich-people-data
  - type: APIReference
    url: https://docs.apollo.io/reference/people-enrichment
  - type: PostmanCollection
    url: collections/apollo-enrich.postman_collection.json
  - type: OpenCollection
    url: collections/apollo-enrich.opencollection.json
  - type: Documentation
    url: https://docs.apollo.io/docs/find-people-using-filters
  - type: APIReference
    url: https://docs.apollo.io/reference/people-api-search
  - type: APIReference
    url: https://docs.apollo.io/reference/organization-enrichment
  - type: APIReference
    url: https://docs.apollo.io/reference/organization-search
  - type: APIReference
    url: https://docs.apollo.io/reference/search-for-contacts
  - type: APIReference
    url: https://docs.apollo.io/reference/search-for-accounts
  - type: APIReference
    url: https://docs.apollo.io/reference/add-contacts-to-sequence
- aid: apollo-enrich:apollo-enrich-people-enrichment-api
  name: Apollo.io People Enrichment API
  description: Match and enrich person records, single or in bulk.
  humanURL: https://docs.apollo.io/reference/people-enrichment
  baseURL: https://api.apollo.io/api/v1
  tags:
  - People Enrichment
  properties:
  - type: OpenAPI
    url: openapi/apollo-enrich-people-enrichment-api-openapi.yml
  - type: Documentation
    url: https://docs.apollo.io/docs/enrich-people-data
  - type: APIReference
    url: https://docs.apollo.io/reference/people-enrichment
  - type: PostmanCollection
    url: collections/apollo-enrich.postman_collection.json
  - type: OpenCollection
    url: collections/apollo-enrich.opencollection.json
  - type: Documentation
    url: https://docs.apollo.io/docs/find-people-using-filters
  - type: APIReference
    url: https://docs.apollo.io/reference/people-api-search
  - type: APIReference
    url: https://docs.apollo.io/reference/organization-enrichment
  - type: APIReference
    url: https://docs.apollo.io/reference/organization-search
  - type: APIReference
    url: https://docs.apollo.io/reference/search-for-contacts
  - type: APIReference
    url: https://docs.apollo.io/reference/search-for-accounts
  - type: APIReference
    url: https://docs.apollo.io/reference/add-contacts-to-sequence
- aid: apollo-enrich:apollo-enrich-people-search-api
  name: Apollo.io People Search API
  description: Search Apollo's people database for prospects.
  humanURL: https://docs.apollo.io/reference/people-enrichment
  baseURL: https://api.apollo.io/api/v1
  tags:
  - People Search
  properties:
  - type: OpenAPI
    url: openapi/apollo-enrich-people-search-api-openapi.yml
  - type: Documentation
    url: https://docs.apollo.io/docs/enrich-people-data
  - type: APIReference
    url: https://docs.apollo.io/reference/people-enrichment
  - type: PostmanCollection
    url: collections/apollo-enrich.postman_collection.json
  - type: OpenCollection
    url: collections/apollo-enrich.opencollection.json
  - type: Documentation
    url: https://docs.apollo.io/docs/find-people-using-filters
  - type: APIReference
    url: https://docs.apollo.io/reference/people-api-search
  - type: APIReference
    url: https://docs.apollo.io/reference/organization-enrichment
  - type: APIReference
    url: https://docs.apollo.io/reference/organization-search
  - type: APIReference
    url: https://docs.apollo.io/reference/search-for-contacts
  - type: APIReference
    url: https://docs.apollo.io/reference/search-for-accounts
  - type: APIReference
    url: https://docs.apollo.io/reference/add-contacts-to-sequence
- aid: apollo-enrich:apollo-enrich-sequences-api
  name: Apollo.io Sequences API
  description: Manage sequences (emailer campaigns) and outreach emails.
  humanURL: https://docs.apollo.io/reference/people-enrichment
  baseURL: https://api.apollo.io/api/v1
  tags:
  - Sequences
  properties:
  - type: OpenAPI
    url: openapi/apollo-enrich-sequences-api-openapi.yml
  - type: Documentation
    url: https://docs.apollo.io/docs/enrich-people-data
  - type: APIReference
    url: https://docs.apollo.io/reference/people-enrichment
  - type: PostmanCollection
    url: collections/apollo-enrich.postman_collection.json
  - type: OpenCollection
    url: collections/apollo-enrich.opencollection.json
  - type: Documentation
    url: https://docs.apollo.io/docs/find-people-using-filters
  - type: APIReference
    url: https://docs.apollo.io/reference/people-api-search
  - type: APIReference
    url: https://docs.apollo.io/reference/organization-enrichment
  - type: APIReference
    url: https://docs.apollo.io/reference/organization-search
  - type: APIReference
    url: https://docs.apollo.io/reference/search-for-contacts
  - type: APIReference
    url: https://docs.apollo.io/reference/search-for-accounts
  - type: APIReference
    url: https://docs.apollo.io/reference/add-contacts-to-sequence
common:
- type: AgenticAccess
  url: agentic-access/apollo-enrich-agentic-access.yml
- type: Authentication
  url: authentication/apollo-enrich-authentication.yml
- type: GitHubOrganization
  url: https://github.com/apolloio
- type: LinkedIn
  url: https://www.linkedin.com/company/apolloio
- type: Website
  url: https://www.apollo.io
- type: Documentation
  url: https://docs.apollo.io
- type: DeveloperPortal
  url: https://developer.apollo.io
- type: Plans
  url: plans/apollo-enrich-plans-pricing.yml
- type: Pricing
  url: https://www.apollo.io/pricing
- type: RateLimits
  url: rate-limits/apollo-enrich-rate-limits.yml
- type: FinOps
  url: finops/apollo-enrich-finops.yml
- url: https://www.apollo.io/blog
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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