# Harmonic REST & GraphQL API

**Canonical:** https://apis.io/apis/harmonic-ai/harmonic-rest-graphql-api/  
**Provider:** Harmonic.ai — https://apis.io/providers/harmonic-ai/  
**Base URL:** https://api.harmonic.ai/  
**Documentation:** https://console.harmonic.ai/docs/api-reference/introduction

Harmonic REST & GraphQL API is one of 2 APIs that [Harmonic.ai](https://apis.io/providers/harmonic-ai/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Startup Intelligence, Venture Capital, Company Data, People Data, and investor-data. The published artifact set on APIs.io includes API documentation, an API reference, an OpenAPI specification, and authentication docs.

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.

## Machine-readable artifacts (19)

- **Documentation** — https://console.harmonic.ai/docs/api-reference/introduction
- **APIReference** — https://console.harmonic.ai/docs/api-reference/introduction
- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/harmonic-ai/refs/heads/main/openapi/harmonic-ai-companies-api-openapi.yml
- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/harmonic-ai/refs/heads/main/openapi/harmonic-ai-persons-api-openapi.yml
- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/harmonic-ai/refs/heads/main/openapi/harmonic-ai-people-api-openapi.yml
- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/harmonic-ai/refs/heads/main/openapi/harmonic-ai-saved-searches-api-openapi.yml
- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/harmonic-ai/refs/heads/main/openapi/harmonic-ai-search-api-openapi.yml
- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/harmonic-ai/refs/heads/main/openapi/harmonic-ai-enrichment-api-openapi.yml
- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/harmonic-ai/refs/heads/main/openapi/harmonic-ai-email-enrichment-api-openapi.yml
- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/harmonic-ai/refs/heads/main/openapi/harmonic-ai-attachments-api-openapi.yml
- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/harmonic-ai/refs/heads/main/openapi/harmonic-ai-investors-api-openapi.yml
- **GraphQL** — https://api.harmonic.ai/graphql
- **Authentication** — https://raw.githubusercontent.com/api-evangelist/harmonic-ai/refs/heads/main/authentication/harmonic-ai-authentication.yml
- **Conventions** — https://raw.githubusercontent.com/api-evangelist/harmonic-ai/refs/heads/main/conventions/harmonic-ai-conventions.yml
- **Postman** — https://www.postman.com/harmonic-ai/harmonic/overview
- **DataModel** — https://raw.githubusercontent.com/api-evangelist/harmonic-ai/refs/heads/main/data-model/harmonic-ai-data-model.yml
- **ErrorCatalog** — https://raw.githubusercontent.com/api-evangelist/harmonic-ai/refs/heads/main/errors/harmonic-ai-problem-types.yml
- **Overlay** — https://raw.githubusercontent.com/api-evangelist/harmonic-ai/refs/heads/main/overlays/harmonic-ai-security-overlay.yaml
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/harmonic-ai/refs/heads/main/apis.yml

## Other Harmonic.ai APIs (1)

- [Harmonic MCP Server](https://apis.io/apis/harmonic-ai/harmonic-mcp-server/)

## Tags

Startup Intelligence, Venture Capital, Company Data, People Data, investor-data, Funding Data, Data Enrichment, Sales Intelligence, Market Intelligence, GraphQL, MCP, agent-native

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/harmonic-ai/harmonic-rest-graphql-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/harmonic-ai/.