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 2 API contracts indexed on the APIs.io network, including Harmonic REST & GraphQL API, and 1 more. 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 and 1 Spectral governance ruleset.

Harmonic.ai’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, pricing, signup flow, and 27 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

57.7/100 strong ▬ flat Agent 59/100 agent ready Front door AI 3/6 light Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 published contract 1 MCP Servers 4 Agent Skills

Startup Intelligence Venture Capital Company Data People Data investor-data Funding Data Data Enrichment Sales Intelligence Market Intelligence GraphQL MCP Agent-Native

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Data & Reference Information Services

AE-230

CompaniesEnrichmentPeoplePersonsSearch

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 57.7/100 · strong

Contract Quality 9.9 / 19

Developer Ergonomics 4.9 / 15

Access Clarity 11.6 / 15

Operational Transparency 1.8 / 10

Contract Governance 2.9 / 9

Discoverability 5.6 / 8

Regulatory Posture 6.8 / 15

Create-or-Update Ergonomics 5.0 / 10

Agent readiness — 59/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

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

Delegated User Identity 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too
Agentic Commerce Well-Known Document +5 pts — a parsing /.well-known/ucp.json or acp.json declaring a version and at least one service, OR (0.27) a live x402 payment challenge from _data/x402-adoption.json — `self` when its endpoints are on the provider's own domain, `platform` when they are on a vendor's
Dry-Run / Simulate Mode +4 pts — OpenAPI: destructive operations expose a dry_run / simulate / preview / validate_only parameter
Well-Known Catalog +4 pts — common[].type includes WellKnown, APICatalog, or api-catalog

1 more unmet check in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Developer Ergonomics scores 32.7 — up to +13.5 composite points
Contract Quality scores 52.7 — up to +11.8 composite points
Operational Transparency scores 18.4 — up to +10.6 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/harmonic-ai/apis.yml: open an issue on github.com/api-evangelist/harmonic-ai to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 6

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

GraphQL

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

Model Context Protocol (MCP)

measured — observed by APIs.io (verified)

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

OpenAPI

measured — observed by APIs.io (published)

OAuth 2.0

measured — observed by APIs.io (declared)

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 9

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

Harmonic.ai Public attachments API

OPEN COLLECTION

Harmonic.ai Public companies API

OPEN COLLECTION

Harmonic.ai Public email_enrichment API

OPEN COLLECTION

Harmonic.ai Public enrichment API

OPEN COLLECTION

Harmonic.ai Public investors API

OPEN COLLECTION

Harmonic.ai Public people API

OPEN COLLECTION

Harmonic.ai Public persons API

OPEN COLLECTION

Harmonic.ai Public saved_searches API

OPEN COLLECTION

Harmonic.ai Public search API

OPEN COLLECTION

Scroll for all 9

MCP Servers 1

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

Harmonic.ai MCP Server

Remote MCP server at mcp.api.harmonic.ai over HTTP; 23 tools listed.

MCP SERVER

Agent Skills 4

Packaged agent skills for driving this provider's APIs from an AI assistant.

Attach a document to an investor record

AGENT SKILL

Build and populate a company watchlist

AGENT SKILL

Enrich a company

AGENT SKILL

Natural-language company search

AGENT SKILL

Harmonic.ai API pricing

Prices published by Harmonic.ai, read 2026-10-28 from harmonic.ai/pricing.

Plan	Price
Console access	Get pricing Includes: 40 million companies, 200 million people, 250 thousand investors, Scout, network mapping, CSV export
API access	Get pricing Includes: Pull Harmonic data to any tool, enrich records, automatic triggers, full MCP access
Bulk data	Get pricing Includes: Every record in your warehouse, refreshed weekly, delivered via S3, BigQuery or Snowflake

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Harmonic Ai Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Harmonic Ai Rate Limits

0 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Harmonic.ai

SLA

FinOps 1

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

Harmonic Ai Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Harmonic Ai Event Surface

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Harmonic.ai API Rules

44 rules · 33 errors 8 warnings 3 info

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Harmonic Ai Security Overlay

3 actions · security · harmonic-ai-openapi.json

GENERATED

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Harmonic Ai Authentication

apiKey/oauth2 · 2 schemes

SECURITY

Harmonic Ai Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Harmonic Ai Vulnerability Disclosure

Hackerone

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Harmonic Ai Scopes

2 scopes · authorizationCode

2 scopes

SCOPES

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Harmonic Ai Agentic Access

118 operations · 67 acting

AGENTIC

Resources

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 2

The organization behind the API

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

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).
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - plans
  - authentication
  - scopes
  - rate-limits
  - security
  generated: '2026-11-06'
  method: derived
image: https://cdn.prod.website-files.com/6107b1101d4d3e748743f234/65f31ad2b4ac6cf0cb8bd691_og-img.png
url: https://raw.githubusercontent.com/api-evangelist/harmonic-ai/refs/heads/main/apis.yml
created: '2026-07-22'
modified: '2026-08-14'
specificationVersion: '0.23'
tags:
- Startup Intelligence
- Venture Capital
- Company Data
- People Data
- investor-data
- Funding Data
- Data Enrichment
- Sales Intelligence
- Market Intelligence
- GraphQL
- MCP
- Agent-Native
tags_raw:
- 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
  tags_raw:
  - 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
  tags_raw:
  - 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: CapabilityMap
  url: capabilities/harmonic-ai-capability-edges.yml
  name: Harmonic.ai Business Capability Map
- type: Website
  url: https://www.harmonic.ai/
- 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

Harmonic.ai API — frequently asked questions

Does Harmonic.ai have an API?

Yes. APIs.io lists 2 APIs from Harmonic.ai, including Harmonic REST & GraphQL API and Harmonic MCP Server.

Is there an OpenAPI specification for the Harmonic.ai API?

Yes. APIs.io indexes 1 OpenAPI specification for Harmonic.ai, each linked for download from this page.

How do I authenticate with the Harmonic.ai API?

Harmonic.ai documents its authentication (apiKey/oauth2 · 2 schemes). The details are profiled on APIs.io as Harmonic Ai Authentication.

How much does the Harmonic.ai API cost?

Harmonic.ai publishes its prices; its Console access plan is Get pricing as of 2026-10-28. APIs.io lists 3 pricing plans for Harmonic.ai, with each plan's price, limits and inclusions under Pricing on this page.

Does Harmonic.ai have an MCP server?

Yes. APIs.io lists 1 MCP server for Harmonic.ai: Remote MCP server at mcp.api.harmonic.ai over HTTP; 23 tools listed.

Is the Harmonic.ai API ready for AI agents?

Harmonic.ai has a Kin Score of 57.7 out of 100 (strong) and an Agent Readiness score of 58.7 (agent-ready), scored by API Evangelist on 2026-11-06.

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