Harmonic.ai

Startup discovery and intelligence platform built on a proprietary database of 30M+ companies and 200M+ people, offering real-time funding data, headcount/traction metrics, team composition, and investor relationships via REST, GraphQL, and a hosted MCP server. Used by venture capital, growth equity, corporate development, and go-to-market teams to find, research, and qualify startups programmatically or through the console web app, Chrome extension, bulk data exports (BigQuery/Snowflake/S3), and CRM integrations (Salesforce/HubSpot/Affinity).

Harmonic.ai publishes 1 API on the APIs.io network: Harmonic REST & GraphQL API. Tagged areas include startup-intelligence, venture-capital, company-data, people-data, and investor-data.

The Harmonic.ai catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Harmonic.ai’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, pricing, signup flow, and 25 more developer resources.

🌐 Visit website 📡 Source on GitHub

60.1/100 strong ▲ 11.3 Agent 65/100 agent ready Full breakdown ↓
scored 2026-08-17 · rubric v0.11.0

AccessSelf serve

2 APIs 2 MCP Servers

startup-intelligenceventure-capitalcompany-datapeople-datainvestor-datafunding-datadata-enrichmentsales-intelligencemarket-intelligencegraphqlmcpagent-native

Kin Score

Kin Score How this is scored →
scored 2026-08-17 · rubric v0.11.0

Composite quality — 60.1/100 · strong

Contract Quality 13.3 / 25

Developer Ergonomics 13.4 / 20

Commercial Clarity 16.8 / 20

Operational Transparency 5.5 / 13

Governance 2.5 / 12

Discoverability 8.7 / 10

Agent readiness — 65/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 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/harmonic-ai: 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 2

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

Harmonic REST & GraphQL API

REST API for company search, enrichment, saved searches, list management, and bulk operations, plus a full GraphQL endpoint for flexible queries across companies, people, invest...

Harmonic MCP Server

Hosted, agent-native MCP server exposing 40+ tools for enrichment, search, saved searches, lists, investors, network mapping, batch lookup, custom fields, and team. Listed in th...

Open Collections 10

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

MCP Servers 2

Model Context Protocol servers that expose these APIs to AI agents.

Rate Limits 1

Documented rate limits and quota policies.

Scopes 1

OAuth scopes governing access to this provider's APIs.

Harmonic Ai Scopes

2 scopes · authorizationCode

2 scopes

SCOPES

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

MCPServer

LLMsTxt

WellKnown

AgentSkill

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Conventions

Conventions

Lifecycle

Lifecycle

Conformance

Conformance

Build 2

SDKs, sample code, and the tooling you integrate with

Postman

Postman

Packages

Packages

Access & Security 6

Authentication, authorization, and security posture

Authentication

Authentication

OAuthScopes

OAuthScopes

DomainSecurity

DomainSecurity

VulnerabilityDisclosure

VulnerabilityDisclosure

Security

Security

Compliance

Compliance

Operate 5

Status, limits, changes, and where to get help

Support

StatusPage

ChangeLog

RateLimits

ChangeLog

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

PrivacyPolicy

Plans

Company 1

The organization behind the API

Blog

Blog

Source (apis.yml)

name: Harmonic.ai
description: Startup discovery and intelligence platform built on a proprietary database of 30M+ companies and 200M+ people,
  offering real-time funding data, headcount/traction metrics, team composition, and investor relationships via REST, GraphQL,
  and a hosted MCP server. Used by venture capital, growth equity, corporate development, and go-to-market teams to find,
  research, and qualify startups programmatically or through the console web app, Chrome extension, bulk data exports (BigQuery/Snowflake/S3),
  and CRM integrations (Salesforce/HubSpot/Affinity).
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://cdn.prod.website-files.com/6107b1101d4d3e748743f234/65f31ad2b4ac6cf0cb8bd691_og-img.png
url: https://harmonic-ai.apievangelist.com/apis.yml
created: '2026-07-22'
modified: '2026-08-14'
specificationVersion: '0.21'
tags:
- startup-intelligence
- venture-capital
- company-data
- people-data
- investor-data
- funding-data
- data-enrichment
- sales-intelligence
- market-intelligence
- graphql
- mcp
- agent-native
apis:
- name: Harmonic REST & GraphQL API
  description: REST API for company search, enrichment, saved searches, list management, and bulk operations, plus a full
    GraphQL endpoint for flexible queries across companies, people, investors, lists, and custom fields. Auth via apikey header
    or OAuth 2.0 bearer tokens.
  humanURL: https://console.harmonic.ai/docs/api-reference/introduction
  baseURL: https://api.harmonic.ai/
  tags:
  - startup-intelligence
  - venture-capital
  - company-data
  - people-data
  - investor-data
  - funding-data
  - data-enrichment
  - sales-intelligence
  - market-intelligence
  - graphql
  - mcp
  - agent-native
  properties:
  - type: Documentation
    url: https://console.harmonic.ai/docs/api-reference/introduction
  - type: APIReference
    url: https://console.harmonic.ai/docs/api-reference/introduction
  - type: OpenAPI
    url: openapi/harmonic-ai-companies-api-openapi.yml
  - type: OpenAPI
    url: openapi/harmonic-ai-persons-api-openapi.yml
  - type: OpenAPI
    url: openapi/harmonic-ai-people-api-openapi.yml
  - type: OpenAPI
    url: openapi/harmonic-ai-saved-searches-api-openapi.yml
  - type: OpenAPI
    url: openapi/harmonic-ai-search-api-openapi.yml
  - type: OpenAPI
    url: openapi/harmonic-ai-enrichment-api-openapi.yml
  - type: OpenAPI
    url: openapi/harmonic-ai-email-enrichment-api-openapi.yml
  - type: OpenAPI
    url: openapi/harmonic-ai-attachments-api-openapi.yml
  - type: OpenAPI
    url: openapi/harmonic-ai-investors-api-openapi.yml
  - type: GraphQL
    url: https://api.harmonic.ai/graphql
  - type: Authentication
    url: authentication/harmonic-ai-authentication.yml
  - type: Conventions
    url: conventions/harmonic-ai-conventions.yml
  - type: Postman
    url: https://www.postman.com/harmonic-ai/harmonic/overview
  - type: DataModel
    url: data-model/harmonic-ai-data-model.yml
  - type: ErrorCatalog
    url: errors/harmonic-ai-problem-types.yml
  - type: Overlay
    url: overlays/harmonic-ai-security-overlay.yaml
- name: Harmonic MCP Server
  description: Hosted, agent-native MCP server exposing 40+ tools for enrichment, search, saved searches, lists, investors,
    network mapping, batch lookup, custom fields, and team. Listed in the Claude Connector store and ChatGPT Apps directory.
    Auth via OAuth 2.0 or API key.
  humanURL: https://support.harmonic.ai/en/articles/12785899-harmonic-mcp-server-getting-started-guide
  baseURL: https://mcp.api.harmonic.ai/
  tags:
  - startup-intelligence
  - mcp
  - agent-native
  - data-enrichment
  - company-data
  - people-data
  - investor-data
  properties:
  - type: MCPServer
    url: mcp/harmonic-ai-mcp.yml
  - type: ToolCrosswalk
    url: mcp/harmonic-ai-tool-crosswalk.yml
  - type: MCPServer
    url: https://mcp.api.harmonic.ai/
  - type: Documentation
    url: https://support.harmonic.ai/en/articles/12785899-harmonic-mcp-server-getting-started-guide
  - type: OAuthScopes
    url: scopes/harmonic-ai-scopes.yml
  - type: LLMsTxt
    url: https://harmonic.ai/llms.txt
common:
- type: AgenticAccess
  url: agentic-access/harmonic-ai-agentic-access.yml
- type: DeveloperPortal
  url: https://console.harmonic.ai/
- type: Documentation
  url: https://console.harmonic.ai/docs/api-reference/introduction
- type: APIReference
  url: https://console.harmonic.ai/docs/api-reference/introduction
- type: GettingStarted
  url: https://console.harmonic.ai/docs/getting-started
- type: Support
  url: https://support.harmonic.ai/
- type: Blog
  url: https://harmonic.ai/blog
- type: Pricing
  url: https://harmonic.ai/pricing
- type: SignUp
  url: https://console.harmonic.ai/signup
- type: Login
  url: https://console.harmonic.ai/login
- type: TermsOfService
  url: https://harmonic.ai/legal/terms-of-service
- type: PrivacyPolicy
  url: https://harmonic.ai/legal/privacy-policy
- type: Postman
  url: https://www.postman.com/harmonic-ai/harmonic/overview
- type: StatusPage
  url: https://status.harmonic.ai
- type: ChangeLog
  url: https://console.harmonic.ai/docs/changelog
- type: MCPServer
  url: mcp/harmonic-ai-mcp.yml
- type: LLMsTxt
  url: llms/harmonic-ai-llms.txt
- type: WellKnown
  url: well-known/harmonic-ai-well-known.yml
- type: Authentication
  url: authentication/harmonic-ai-authentication.yml
- type: OAuthScopes
  url: scopes/harmonic-ai-scopes.yml
- type: Conventions
  url: conventions/harmonic-ai-conventions.yml
- type: Lifecycle
  url: lifecycle/harmonic-ai-lifecycle.yml
- type: Conformance
  url: conformance/harmonic-ai-conformance.yml
- type: DomainSecurity
  url: security/harmonic-ai-domain-security.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Packages
  url: packages/harmonic-ai-packages.yml
- type: RateLimits
  url: rate-limits/harmonic-ai-rate-limits.yml
- type: Plans
  url: plans/harmonic-ai-plans-pricing.yml
- type: ChangeLog
  url: changelog/harmonic-ai-changelog.yml
- type: VulnerabilityDisclosure
  url: security/harmonic-ai-vulnerability-disclosure.yml
- type: Security
  url: security/harmonic-ai-vulnerability-disclosure.yml
- type: Compliance
  url: conformance/harmonic-ai-conformance.yml
maintainers:
- FN: Harmonic.ai
  email: info@harmonic.ai
  url: https://harmonic.ai/
generated:
  by: apis.io/add
  model: claude-opus-4-8
  confidence: 95
  at: '2026-07-22T16:00:02.185Z'
x-enrichment:
  date: '2026-08-14'
  status: enriched
  artifacts_added: 9
  pass: local-v1