Apollo.io
Apollo.io is a sales intelligence and engagement platform combining a 270M+ contact database with email and call sequencing. The Apollo REST API exposes people search & enrichment, organization search & enrichment, contacts, accounts, deals, sequences, email accounts, calls, tasks, meetings, lists, and webhooks.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles Apollo.io the way a machine reads it — 54 machine-readable artifacts across 35 APIs, 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.io scores 52.4/100 (developing), with a separate agent-readiness read of 65/100 (agent native). 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.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Apollo.io
Each block below is one kind of artifact we hold for Apollo.io. 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 35
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 Organization Search API
Search Apollo's organization database by industry, headcount, revenue, technology stack, location, and funding stage.
Apollo People Enrichment API
Enrich a known person record by email, LinkedIn URL, name + company, or other identifiers; returns work email, mobile, title, social profiles, and tenure.
Apollo Organization Enrichment API
Enrich a known organization by domain or LinkedIn URL; returns headcount, industry, revenue, funding, technologies, and location.
Apollo Bulk People Enrichment API
Enrich up to 10 person records in a single API call to reduce round-trip and credit cost.
Apollo Bulk Organization Enrichment API
Enrich multiple organizations in a single API call.
Apollo Contacts API
Manage contacts in your Apollo CRM workspace — create, update, delete, and bulk-import contacts with custom fields and tags.
Apollo Accounts API
Manage accounts (companies) in your Apollo CRM with stage, ownership, and custom fields.
Apollo Deals API
Manage deals (opportunities) attached to accounts and contacts, including stage, value, probability, and custom fields.
Apollo Sequences API
Manage outreach sequences (cadences) and add or remove contacts as sequence subscribers; trigger sends and pause/resume schedules.
Apollo Email Accounts API
Manage connected email accounts (Gmail / Outlook / SMTP) used for outbound sequence sends and inbox sync.
Apollo Emails API
Read sent / received email metadata and tracking events (open, click, reply, bounce) for sequence emails.
Apollo Calls API
Log inbound and outbound calls with duration, recording URLs, transcripts, and disposition outcomes.
Apollo Tasks API
Manage user tasks tied to contacts and accounts.
Apollo Meetings API
Manage meetings booked via Apollo's Meetings (scheduling) feature and synced from connected calendar accounts.
Apollo Custom Fields API
Define and read custom field schemas across people, organizations, contacts, accounts, and deals.
Apollo Lists API
Manage saved lists (static and dynamic) for segmenting people and accounts and feeding them into sequences and dialer queues.
Apollo Tags API
Read, create, and apply tags to contacts and accounts for categorization and filtering.
Apollo Users API
Manage users (sales reps, managers) and their roles within the Apollo workspace.
Apollo Analytics API
Pull aggregated activity, sequence performance, dialer, and pipeline analytics for reporting use cases.
Apollo API Usage API
Read your workspace's API usage and remaining credit balance across hourly, daily, and monthly windows.
Apollo Webhooks API
Subscribe to Apollo events (contact.created, sequence.added, email.opened, call.completed) for downstream automation.
Apollo.io Accounts API
The Accounts API from Apollo.io — 3 operation(s) for accounts.
Apollo.io Contacts API
The Contacts API from Apollo.io — 3 operation(s) for contacts.
Apollo.io Email Accounts API
The Email Accounts API from Apollo.io — 1 operation(s) for email accounts.
Apollo.io Emailer Campaigns API
The Emailer Campaigns API from Apollo.io — 3 operation(s) for emailer campaigns.
Apollo.io Mixed Companies API
The Mixed Companies API from Apollo.io — 1 operation(s) for mixed companies.
Apollo.io Mixed People API
The Mixed People API from Apollo.io — 1 operation(s) for mixed people.
Apollo.io Opportunities API
The Opportunities API from Apollo.io — 3 operation(s) for opportunities.
Apollo.io Organizations API
The Organizations API from Apollo.io — 2 operation(s) for organizations.
Apollo.io People API
The People API from Apollo.io — 2 operation(s) for people.
Apollo.io Phone Calls API
The Phone Calls API from Apollo.io — 3 operation(s) for phone calls.
Apollo.io Sync Report API
The Sync Report API from Apollo.io — 1 operation(s) for sync report.
Apollo.io Tasks API
The Tasks API from Apollo.io — 3 operation(s) for tasks.
Apollo.io Usage Stats API
The Usage Stats API from Apollo.io — 1 operation(s) for usage stats.
Apollo.io Users API
The Users API from Apollo.io — 1 operation(s) for users.
Scroll within the panel for all 35 ·
Open Collections 1
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).
Apollo.io API
OPEN COLLECTIONMCP 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.
MCP Server
MCP SERVERGraphQL 1
Where a provider ships GraphQL, the schema is the contract. We profile it alongside the REST surface so the whole interface is legible in one place.
GraphQL schemas published by this provider.
Apollo.io GraphQL Schema
This is a conceptual GraphQL schema for the Apollo.io B2B sales intelligence and engagement platform. Apollo.io does not natively expose a GraphQL endpoint; this schema is deriv...
GRAPHQLPricing 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 six things the Kin Score reads for commercial clarity.
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 Io 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.
Apollo Io Finops
FINOPSFeatures 10
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.
Scroll within the panel for all 10 ·
Security Posture 2
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.
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.
Resources
Every other property we hold for Apollo.io — 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 1
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 3
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 1
Pagination, idempotency, versioning, errors, and events
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 3
Authentication, authorization, and security posture
Operate 4
Status, limits, changes, and where to get help
Commercial 5
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
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