Caplight Company Lookup API

openapi: 3.2.0
info:
  version: 2.0.0
  title: Caplight REST Company Lookup API
  description: 'This page provides documentation for the Caplight API, a paid add-on product of [Caplight Data](https://www.data.caplight.com). To request API access, please contact us at contact@caplight.com.


    # Production server

    https://us-central1-caplight-prod.cloudfunctions.net/api/public


    # Staging/sandbox server

    https://us-central1-caplight-staging.cloudfunctions.net/api/public


    # API versions

    Endpoints are versioned via path prefix: `/v1/` for company, market price, and order book; `/v2/` for company lookup, funding rounds, investors, company details, and comps.


    # Company IDs

    Companies have two ID formats: a **v1 company ID** (used in v1 endpoints) and a **v2 company ID** (used in v2 endpoints). Both v1 and v2 company responses include both in `caplightIds` for cross-referencing. Path params that accept company identifiers support either format, plus PitchBook ID and company domain where applicable.


    If you have a domain, a v1 company ID or a PitchBook ID and need the v2 company ID, call `GET /v2/companies` — it resolves up to 50 identifiers per request and covers companies added recently.


    # V2 Access & Permissions


    **Company access:** v2 company-scoped endpoints (funding rounds, investors, company details, and comps) enforce per-account access control. Your account may have (1) a whitelist of permitted companies, (2) an annual limit on distinct companies you can access, or both. Accessing the same company multiple times counts once toward the limit. The `/funding-rounds/updates` endpoint returns only rounds for companies you have access to.


    **Restricted fields:** Some accounts have field-level restrictions. When a field is restricted, it is omitted from the response and its name appears in `restricted.fields` on the funding round object. Restricted fields may include: `amounts`, `valuation`, `pps`, `participants`, `citations`. Check for a `restricted` object and handle omitted fields in your integration.


    # Widget Embed

    In addition to this API, Caplight also provides an embeddable widget for customers who would like an easy way of integrating Caplight Data into their platform. [See example](https://storage.googleapis.com/caplight-prod.appspot.com/images/embed-example-3.png). For inquiries, please contact us directly.


    # Authentication


    <SecurityDefinitions />

    '
  termsOfService: https://platform.caplight.com/terms
  contact:
    name: 'Contact: Caplight Engineering'
    email: engineering@caplight.com
  x-logo:
    url: https://storage.googleapis.com/caplight-prod.appspot.com/caplight-logos/api-logo.png
    altText: Caplight logo
servers:
- url: //us-central1-caplight-prod.cloudfunctions.net/api/public
  description: Production
- url: //us-central1-caplight-staging.cloudfunctions.net/api/public
  description: Staging/Sandbox
tags:
- name: Company Lookup
  description: Resolves company domains, PitchBook IDs and v1 company IDs to v2 company IDs, in batches.
paths:
  /v2/companies:
    get:
      tags:
      - Company Lookup
      summary: Look up company IDs
      description: 'Resolves company domains, PitchBook IDs and v1 company IDs to v2 company IDs — including for companies added recently.


        **Batching:** each parameter may be repeated, e.g. `?domain=clickhouse.com&domain=neros.tech&v1Id=abc123xyz`. At most 50 identifiers in total across all three parameters; more returns 400.


        **Results:** one entry per identifier requested, echoing it back in `query` so responses line up with requests. Entries are grouped by identifier type in the order `domain`, `pitchbookId`, `v1Id` — not in query-string order. An identifier that matches nothing comes back with an empty `matches` array rather than a 404.


        A domain can match more than one company, because subsidiaries, acquired shells and stale duplicates share one. Every candidate is returned, best match first: not acquired, then an exact website match, then an active business status, then companies carrying market data, then the highest last known funding round valuation.


        **Access:** requires Companies V2 API access. Unlike the other v2 company endpoints, lookup does not enforce per-company access control and does not count toward your annual distinct-company limit — it returns identity only. `pitchbookId` is not included on matches; read it from `GET /v2/companies/{companyId}` once you have access to the company.'
      parameters:
      - name: domain
        in: query
        description: Company website domain or URL. The root domain is extracted and lowercased before matching, so `https://www.clickhouse.com/docs` and `clickhouse.com` behave identically. Repeatable.
        required: false
        style: form
        explode: true
        schema:
          type: array
          items:
            type: string
        example:
        - clickhouse.com
        - neros.tech
      - name: pitchbookId
        in: query
        description: PitchBook company ID. Repeatable.
        required: false
        style: form
        explode: true
        schema:
          type: array
          items:
            type: string
        example:
        - 41339-53
      - name: v1Id
        in: query
        description: v1 company ID — the same value the v1 endpoints return as `caplightId`. Repeatable.
        required: false
        style: form
        explode: true
        schema:
          type: array
          items:
            type: string
        example:
        - abc123xyz
      responses:
        '200':
          description: Successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PublicCompanyLookupResponse'
              example:
                results:
                - query:
                    type: domain
                    value: clickhouse.com
                  matches:
                  - id: b2c3d4e5-f6a7-8901-bcde-f12345678901
                    name: ClickHouse
                    domain: clickhouse.com
                    caplightIds:
                      v2Id: b2c3d4e5-f6a7-8901-bcde-f12345678901
                      v1Id: abc123xyz
                - query:
                    type: domain
                    value: neros.tech
                  matches: []
        '400':
          description: No identifier supplied, or more than 50 identifiers in one request
        '401':
          description: Missing or invalid API key
        '403':
          description: Account does not have Companies V2 API access
components:
  schemas:
    PublicCompanyLookupResponse:
      type: object
      required:
      - results
      properties:
        results:
          type: array
          items:
            $ref: '#/components/schemas/PublicCompanyLookupResult'
    PublicCompanyLookupMatch:
      description: A company matched by a lookup. `pitchbookId` is not included — read it from `GET /v2/companies/{companyId}`.
      type: object
      required:
      - id
      - name
      - domain
      - caplightIds
      properties:
        id:
          type: string
          description: v2 company ID
          example: b2c3d4e5-f6a7-8901-bcde-f12345678901
        name:
          type: string
          description: Company name
          example: ClickHouse
        domain:
          type: string
          nullable: true
          description: Company domain on record, which may differ from the domain queried when the match came from the company's website
          example: clickhouse.com
        caplightIds:
          type: object
          required:
          - v2Id
          - v1Id
          properties:
            v2Id:
              type: string
              description: v2 company ID
            v1Id:
              type: string
              nullable: true
              description: v1 company ID, null when the company has no v1 record
    PublicCompanyLookupResult:
      description: The matches for one requested identifier.
      type: object
      required:
      - query
      - matches
      properties:
        query:
          type: object
          description: The identifier this entry answers, echoed back so responses line up with requests
          required:
          - type
          - value
          properties:
            type:
              type: string
              enum:
              - domain
              - pitchbookId
              - v1Id
            value:
              type: string
              example: clickhouse.com
        matches:
          type: array
          description: Every company matching the identifier, best match first. Empty when nothing matched.
          items:
            $ref: '#/components/schemas/PublicCompanyLookupMatch'
  securitySchemes:
    api_key:
      description: Caplight API authentication is managed through an api_key header value. Please contact us if you do not yet have an API key.
      type: apiKey
      name: api_key
      in: header
x-tagGroups:
- name: V1
  tags:
  - Company
  - Companies
  - MarketPrice
  - Live Orderbook
  - Trade History
  - Order History
  - Company Filings
  - Stock Splits
  - Fund Marks
  - News
  - company_model
  - order_model
  - market_price_model
  - trade_model
  - 409a_valuation_model
  - fund_mark_model
  - comp_model
  - stock_split_model
  - coi_model
- name: V2
  tags:
  - Funding Rounds
  - Investors
  - Company Lookup
  - Company Details
  - Comps