openapi: 3.2.0
info:
  title: APIs.io Venture Capital API
  description: |-
    Venture-capital firms as a first-class entity — fund identity plus a network-matched, rated PORTFOLIO GRAPH. Browse firms, walk a fund's portfolio (filter to API providers / by rating band), and follow the reverse edge from a provider to the VCs that back it. Pro, except the per-provider investor lookup.

    This is the Venture Capital surface of the [APIs.io API](https://apis.io/api/v1) — one of 17 contracts split from the full API by tag, each documented and governed on its own. See the APIs.json index for the whole set.
  version: 1.5.0
  contact:
    name: API Evangelist
    url: https://apis.io
  license:
    name: CC BY 4.0
    url: https://creativecommons.org/licenses/by/4.0/
servers:
  - url: https://apis.io/api/v1
    description: Production server.
tags:
  - name: Venture Capital
    description: Venture-capital firms as a first-class entity — fund identity plus a network-matched, rated PORTFOLIO GRAPH. Browse firms, walk a fund's portfolio (filter to API providers / by rating band), and follow the reverse edge from a provider to the VCs that back it. Pro, except the per-provider investor lookup.
paths:
  /vcs:
    get:
      operationId: listVcs
      x-mcp-tool: find_vcs
      tags:
        - Venture Capital
      summary: List / search venture-capital firms.
      description: Venture-capital firms in the network, each with a network-matched, rated portfolio graph. Filter by text, thesis tags, or category; sort by portfolio_on_network (default), portfolio_total, portfolio_rating, or name. Pro.
      parameters:
        - name: q
          in: query
          description: Free text over firm name + description.
          schema:
            type: string
            maxLength: 1024
        - name: tags
          in: query
          description: Thesis tag slugs (comma-separated).
          schema:
            type: string
            maxLength: 1024
        - name: category
          in: query
          schema:
            type: string
            maxLength: 1024
          description: Filter firms by category.
        - name: sort
          in: query
          schema:
            type: string
            enum:
              - portfolio_on_network
              - portfolio_total
              - portfolio_rating
              - name
          description: Sort order.
        - name: page
          in: query
          schema:
            type: integer
            maximum: 1000000
          description: 1-based page number.
        - name: limit
          in: query
          schema:
            type: integer
            maximum: 1000000
          description: Items per page.
      responses:
        "200":
          description: A page of VC firms (identity + portfolio summary).
          content:
            application/json:
              schema:
                type: object
                additionalProperties: true
          headers:
            ratelimit-policy:
              $ref: "#/components/headers/RateLimitPolicy"
            x-ratelimit-tier:
              $ref: "#/components/headers/RateLimitTier"
            x-ratelimit-limit:
              $ref: "#/components/headers/RateLimitLimit"
            x-ratelimit-window:
              $ref: "#/components/headers/RateLimitWindow"
        "402":
          $ref: "#/components/responses/UpgradeRequired"
      x-tier: pro
      security: []
  /vcs/{slug}:
    get:
      operationId: getVc
      x-mcp-tool: get_vc
      tags:
        - Venture Capital
      summary: One VC firm — identity, fund facts, portfolio summary.
      description: Identity, fund facts (properties), and portfolio summary (totals, band distribution, average rating). Pass view=full to inline the full portfolio graph. Pro.
      parameters:
        - name: slug
          in: path
          required: true
          schema:
            type: string
            maxLength: 1024
          description: Slug of the company, as it appears on its apis.io page.
        - name: view
          in: query
          schema:
            type: string
            enum:
              - summary
              - full
          description: How much of the record to return.
      responses:
        "200":
          description: The VC firm.
          content:
            application/json:
              schema:
                type: object
                additionalProperties: true
          headers:
            ratelimit-policy:
              $ref: "#/components/headers/RateLimitPolicy"
            x-ratelimit-tier:
              $ref: "#/components/headers/RateLimitTier"
            x-ratelimit-limit:
              $ref: "#/components/headers/RateLimitLimit"
            x-ratelimit-window:
              $ref: "#/components/headers/RateLimitWindow"
        "402":
          $ref: "#/components/responses/UpgradeRequired"
        "404":
          $ref: "#/components/responses/NotFound"
      x-tier: pro
      security: []
  /vcs/{slug}/portfolio:
    get:
      operationId: getVcPortfolio
      x-mcp-tool: vc_portfolio
      tags:
        - Venture Capital
      summary: A VC firm's portfolio graph.
      description: The firm's portfolio companies, each matched to the network and rated. Filter is_provider=true (only API providers), in_network=true, band, or min_score; sort by score (default), api_count, or name. Pro.
      parameters:
        - name: slug
          in: path
          required: true
          schema:
            type: string
            maxLength: 1024
          description: Slug of the company, as it appears on its apis.io page.
        - name: is_provider
          in: query
          description: Only companies that publish an API on the network.
          schema:
            type: boolean
        - name: in_network
          in: query
          schema:
            type: boolean
          description: Only portfolio companies already profiled on the network.
        - name: band
          in: query
          schema:
            type: string
            maxLength: 1024
          description: Filter to companies in this rating band.
        - name: min_score
          in: query
          schema:
            type: number
            maximum: 1000000
          description: Only results at or above this composite score.
        - name: sort
          in: query
          schema:
            type: string
            enum:
              - score
              - api_count
              - name
          description: Sort order.
        - name: page
          in: query
          schema:
            type: integer
            maximum: 1000000
          description: 1-based page number.
        - name: limit
          in: query
          schema:
            type: integer
            maximum: 1000000
          description: Items per page.
      responses:
        "200":
          description: A page of portfolio companies with network match + rating.
          content:
            application/json:
              schema:
                type: object
                additionalProperties: true
          headers:
            ratelimit-policy:
              $ref: "#/components/headers/RateLimitPolicy"
            x-ratelimit-tier:
              $ref: "#/components/headers/RateLimitTier"
            x-ratelimit-limit:
              $ref: "#/components/headers/RateLimitLimit"
            x-ratelimit-window:
              $ref: "#/components/headers/RateLimitWindow"
        "402":
          $ref: "#/components/responses/UpgradeRequired"
        "404":
          $ref: "#/components/responses/NotFound"
      x-tier: pro
      security: []
  /providers/{slug}/investors:
    get:
      operationId: getProviderInvestors
      x-mcp-tool: find_investors
      tags:
        - Venture Capital
      summary: Which VC firms back this provider (reverse portfolio edge).
      description: The venture-capital firms in the network whose portfolio includes this provider/company. The reverse of the VC portfolio graph. Free.
      parameters:
        - $ref: "#/components/parameters/ProviderSlug"
      responses:
        "200":
          description: The backing VC firms.
          content:
            application/json:
              schema:
                type: object
                additionalProperties: true
          headers:
            ratelimit-policy:
              $ref: "#/components/headers/RateLimitPolicy"
            x-ratelimit-tier:
              $ref: "#/components/headers/RateLimitTier"
            x-ratelimit-limit:
              $ref: "#/components/headers/RateLimitLimit"
            x-ratelimit-window:
              $ref: "#/components/headers/RateLimitWindow"
        "404":
          $ref: "#/components/responses/NotFound"
      x-tier: free
      security: []
components:
  responses:
    NotFound:
      description: Resource not found.
      content:
        application/problem+json:
          schema:
            $ref: "#/components/schemas/Problem"
          example:
            type: https://apis.io/problems/not-found
            title: Resource not found
            status: 404
            detail: No API found with aid `twilio:nope`.
            instance: /v1/apis/twilio:nope
      headers:
        ratelimit-policy:
          $ref: "#/components/headers/RateLimitPolicy"
        x-ratelimit-tier:
          $ref: "#/components/headers/RateLimitTier"
        x-ratelimit-limit:
          $ref: "#/components/headers/RateLimitLimit"
        x-ratelimit-window:
          $ref: "#/components/headers/RateLimitWindow"
    UpgradeRequired:
      description: Payment Required — this operation needs a paid tier. Send a plan key in `X-API-Key`.
      content:
        application/problem+json:
          schema:
            $ref: "#/components/schemas/Problem"
          example:
            type: https://apis.io/problems/upgrade-required
            title: Upgrade required
            status: 402
            detail: This endpoint requires the Understanding or Influence plan.
            instance: /v1/ratings
      headers:
        ratelimit-policy:
          $ref: "#/components/headers/RateLimitPolicy"
        x-ratelimit-tier:
          $ref: "#/components/headers/RateLimitTier"
        x-ratelimit-limit:
          $ref: "#/components/headers/RateLimitLimit"
        x-ratelimit-window:
          $ref: "#/components/headers/RateLimitWindow"
  schemas:
    Problem:
      type: object
      description: |
        A Problem Details object per [RFC 9457](https://www.rfc-editor.org/rfc/rfc9457).
        Served as `application/problem+json`. Extension members (e.g. `parameter`) may be
        added alongside the standard fields.
      properties:
        type:
          type: string
          format: uri
          default: about:blank
          description: A URI identifying the problem type; dereferences to human-readable docs.
          examples:
            - https://apis.io/problems/invalid-parameter
          maxLength: 2048
        title:
          type: string
          description: A short, human-readable summary of the problem type.
          examples:
            - Invalid parameter
          maxLength: 1024
        status:
          type: integer
          minimum: 100
          maximum: 599
          description: The HTTP status code, repeated for convenience.
          examples:
            - 400
        detail:
          type: string
          description: A human-readable explanation specific to this occurrence.
          maxLength: 20000
          examples:
            - "`match` must be one of: any, all."
        instance:
          type: string
          format: uri-reference
          description: A URI reference identifying the specific occurrence (typically the request path).
          maxLength: 2048
          examples:
            - /v1/search
        parameter:
          type: string
          description: Extension member — the offending query/path parameter, when applicable.
          maxLength: 1024
          examples:
            - match
      required:
        - type
        - title
        - status
      additionalProperties: true
  parameters:
    ProviderSlug:
      name: slug
      in: path
      required: true
      description: Provider slug (e.g. `twilio`).
      schema:
        type: string
        maxLength: 1024
  headers:
    RateLimitPolicy:
      description: The quota and burst policy applied to this key, in the RFC 9745 RateLimit-Policy form.
      schema:
        type: string
        maxLength: 1024
      example: "\"quota\";q=500;w=86400, \"burst\";q=5;w=1"
    RateLimitTier:
      description: The tier the call was served at. Keyless callers are served `free`.
      schema:
        type: string
        enum:
          - free
          - pro
          - business
      example: free
    RateLimitLimit:
      description: Requests allowed in the current quota window.
      schema:
        type: integer
        maximum: 1000000
      example: 500
    RateLimitWindow:
      description: Length of the quota window, in seconds.
      schema:
        type: integer
        maximum: 1000000
      example: 86400
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: X-API-Key
      description: Send a plan key to be served above the free tier. Keyless callers get the free tier; a call that needs a paid tier answers 402 rather than refusing the connection.