Apollo.io
Apollo.io is a sales intelligence and go-to-market platform combining a database of 240M+ contacts and 30M+ companies with enrichment, sequencing, dialing and conversation intelligence. Its REST API publishes 80 operations at https://api.apollo.io/api/v1 across people and company search, single and bulk enrichment, CRM accounts, contacts and deals, outreach sequences, one-off emails, tasks, calls, conversations, custom fields, lists, analytics and usage stats — described by a first-party OpenAPI 3.1.0 document. Apollo also ships a hosted MCP server, a first-party CLI, and provider-published agent skills for both.
Solid contracts, transparent operations, and an easy start — typically complete on four or five facets with one clear soft spot.
API Evangelist profiles Apollo.io the way a machine reads it — 55 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.io scores 60.1/100 (strong), with a separate agent-readiness read of 55/100 (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.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 19
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.io Enrichment API
People and company enrichment, single and bulk. 4 operation(s) from the published Apollo OpenAPI.
Apollo.io Search API
Database search across Apollo's people, company, job-posting and news data. 6 operation(s) from the published Apollo OpenAPI.
Apollo.io Accounts API
Workspace CRM accounts — create, update, search, stages and ownership. 8 operation(s) from the published Apollo OpenAPI.
Apollo.io Contacts API
Workspace CRM contacts — create, update, search, stages and ownership. 10 operation(s) from the published Apollo OpenAPI.
Apollo.io Deals API
Deals (opportunities), their stages, and the deals attached to a contact. 5 operation(s) from the published Apollo OpenAPI.
Apollo.io Sequences API
Outreach sequences — create, update, approve, abort, archive, enrollment and activity. 12 operation(s) from the published Apollo OpenAPI.
Apollo.io Emailer Messages API
One-off email drafting, sending, send status and content retrieval. 4 operation(s) from the published Apollo OpenAPI.
Apollo.io Tasks API
Tasks against contacts, accounts and deals — create, search, update, complete, skip. 7 operation(s) from the published Apollo OpenAPI.
Apollo.io Calls API
Phone-call records — log, search and update dialer activity. 3 operation(s) from the published Apollo OpenAPI.
Apollo.io Conversations API
Conversation intelligence — search recorded calls and meetings, read insights, export. 4 operation(s) from the published Apollo OpenAPI.
Apollo.io Analytics API
The Query Analytics Report endpoint — metrics, dimensions and filters over engagement data. 1 operation(s) from the published Apollo OpenAPI.
Apollo.io Fields API
Field and custom-field definitions across contacts, accounts and opportunities. 4 operation(s) from the published Apollo OpenAPI.
Apollo.io Miscellaneous API
Users, email accounts, lists and labels, notes, usage stats and webhook results. 12 operation(s) from the published Apollo OpenAPI.
Apollo MCP Server
Apollo's hosted Model Context Protocol server. A remote Streamable-HTTP endpoint at https://mcp.apollo.io/mcp, authenticated with OAuth 2.0 and no API key, exposing 51 published...
Apollo.io Users API
The Users API from Apollo.io — 1 operation(s) for users.
Apollo.io Organization Enrichment API
Match and enrich company records, single or in bulk.
Apollo.io Organization Search API
Search Apollo's company database.
Apollo.io People Enrichment API
Match and enrich person records, single or in bulk.
Apollo.io People Search API
Search Apollo's people database for prospects.
Scroll within the panel for all 19 ·
Open Collections 14
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 COLLECTIONApollo.io Accounts API
OPEN COLLECTIONApollo.io Analytics API
OPEN COLLECTIONApollo.io Calls API
OPEN COLLECTIONApollo.io Contacts API
OPEN COLLECTIONApollo.io Conversations API
OPEN COLLECTIONApollo.io Deals API
OPEN COLLECTIONApollo.io Emailer Messages API
OPEN COLLECTIONApollo.io Enrichment API
OPEN COLLECTIONApollo.io Fields API
OPEN COLLECTIONApollo.io Miscellaneous API
OPEN COLLECTIONApollo.io Search API
OPEN COLLECTIONApollo.io Sequences API
OPEN COLLECTIONApollo.io Tasks API
OPEN COLLECTIONScroll within the panel for all 14 ·
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.io MCP Server
Prospect, enrich leads, and manage outreach sequences with Apollo.io. Connects Apollo's contact database, real-time enrichment engine, and sales engagement surface to an MCP cli...
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 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 12
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 12 ·
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.
Apollo Io Webhooks
ASYNCAPISecurity 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.
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 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 3
SDKs, sample code, and the tooling you integrate with
Access & Security 6
Authentication, authorization, and security posture
Operate 4
Status, limits, changes, and where to get help
Commercial 6
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
← All providers · Data indexed from github.com/api-evangelist/apollo-io · machine-readable index on apis.io
This is an independent, third-party profile of Apollo.io, 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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