Apollo API Documentation
Apollo.io is a sales intelligence and engagement platform. Its REST API provides programmatic access to a database of over 240 million contacts and 30 million companies, covering people and organization enrichment (single and bulk), people/company/news search, and go-to-market workflow management across accounts, contacts, deals, sequences, emails, tasks, calls, conversations, lists and custom fields. Apollo users authenticate with an API key in the x-api-key header; partners building on behalf of mutual users authenticate with OAuth 2.0. Apollo publishes a complete OpenAPI 3.1 specification, a hosted remote MCP server at mcp.apollo.io, and a first-party CLI.
Solid contracts, transparent operations, and an easy start — typically complete on four or five facets with one clear soft spot.
API Evangelist profiles Apollo API Documentation the way a machine reads it — 53 machine-readable artifacts across 1 API, 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 — Apollo API Documentation scores 60.3/100 (strong), with a separate agent-readiness read of 36/100 (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 2026-09-10 · rubric v0.20.0
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How we profile Apollo API Documentation
Each block below is one kind of artifact we hold for Apollo API Documentation. 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 14
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.
Apollo API Accounts
Create, update, and search the companies your team tracks in Apollo. Harvested from the Apollo-published OpenAPI 3.1 specification — 8 operation(s).
Apollo API Analytics
Query saved analytics reports. Harvested from the Apollo-published OpenAPI 3.1 specification — 1 operation(s).
Apollo API Calls
Log and update call records made inside or outside Apollo. Harvested from the Apollo-published OpenAPI 3.1 specification — 3 operation(s).
Apollo API Contacts
Create, update, and search the people your team saves in Apollo. Harvested from the Apollo-published OpenAPI 3.1 specification — 10 operation(s).
Apollo API Conversations
Search, export, and retrieve recorded conversations. Harvested from the Apollo-published OpenAPI 3.1 specification — 4 operation(s).
Apollo API Deals
Create, update, and track deals in your pipeline. Harvested from the Apollo-published OpenAPI 3.1 specification — 5 operation(s).
Apollo API Emailer Messages
The Emailer Messages surface of the Apollo API. Harvested from the Apollo-published OpenAPI 3.1 specification — 4 operation(s).
Apollo API Enrichment
Enrich people and company records, individually or in bulk. Harvested from the Apollo-published OpenAPI 3.1 specification — 4 operation(s).
Apollo API Fields
List, create, and update the fields and custom fields in your Apollo account. Harvested from the Apollo-published OpenAPI 3.1 specification — 4 operation(s).
Apollo API Miscellaneous
Users, email accounts, lists, notes, usage stats, and webhook results. Harvested from the Apollo-published OpenAPI 3.1 specification — 12 operation(s).
Apollo API Search
Search Apollo's database of people, companies, news articles, and job postings. Harvested from the Apollo-published OpenAPI 3.1 specification — 6 operation(s).
Apollo API Sequences
Manage outreach sequences and the contacts enrolled in them. Harvested from the Apollo-published OpenAPI 3.1 specification — 12 operation(s).
Apollo API Tasks
Create and search tasks for your go-to-market workflows. Harvested from the Apollo-published OpenAPI 3.1 specification — 7 operation(s).
Apollo MCP
Apollo's hosted remote Model Context Protocol server. Streamable HTTP transport at https://mcp.apollo.io/mcp, OAuth 2.0 authorization with dynamic client registration, exposing ...
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Open Collections 15
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).
API Collection
OPEN COLLECTIONApollo API — Accounts
OPEN COLLECTIONApollo API — Analytics
OPEN COLLECTIONApollo API — Calls
OPEN COLLECTIONApollo API — Contacts
OPEN COLLECTIONApollo API — Conversations
OPEN COLLECTIONApollo API — Deals
OPEN COLLECTIONApollo API — Emailer Messages
OPEN COLLECTIONApollo API — Enrichment
OPEN COLLECTIONApollo API — Fields
OPEN COLLECTIONApollo API — Miscellaneous
OPEN COLLECTIONApollo API — Search
OPEN COLLECTIONApollo API — Sequences
OPEN COLLECTIONApollo API — Tasks
OPEN COLLECTIONApollo.io API
OPEN COLLECTIONScroll within the panel for all 15 ·
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.
Apollo MCP
Apollo ships a first-party hosted remote MCP server that exposes its 240M+ contact database, real-time enrichment engine, CRM records, sequences, tasks, conversations and analyt...
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.
Apollo Api Documentation Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Features 8
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
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.
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Event 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.
Security 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.
Use Cases 4
What developers actually build with this provider — captured so the catalogue answers 'what is this for', not just 'what does this expose'.
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 tell you where this provider already fits in a stack.
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
Every other property we hold for Apollo API Documentation — 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 5
Portal, sign-up, and the first successful call
Documentation 3
Reference material describing how the API behaves
Agent Surfaces 6
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 6
Pagination, idempotency, versioning, errors, and events
Build 5
SDKs, sample code, and the tooling you integrate with
Access & Security 7
Authentication, authorization, and security posture
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Learn 1
Tutorials, courses, talks, and written guidance
Operate 5
Status, limits, changes, and where to get help
Commercial 5
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 1
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/apollo-api-documentation · machine-readable index on apis.io
This is an independent, third-party profile of Apollo API Documentation, 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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