openapi: 3.2.0
info:
  title: DeepInquiry Verified Facts API
  version: 1.0.0
  description: DeepInquiry publishes short factual claims that have been checked for how many separate source groups support them.
  contact:
    name: DeepInquiry API
    email: api@deepinquiry.ai
    url: https://www.deepinquiry.ai/docs
  license:
    name: DeepInquiry Terms of Service
    url: https://www.deepinquiry.ai/terms
servers:
- url: https://api.deepinquiry.ai/api
  description: DeepInquiry API
security:
- ApiKeyAuth: []
tags:
- name: Facts
  description: Read-only access to the verified-facts corpus.
paths:
  /v1/facts:
    get:
      tags:
      - Facts
      summary: List approved facts
      description: 'Returns up to 50 approved facts, filtered by category and verification

        tier. Order is randomized on the server so repeated calls return

        different samples.'
      operationId: listFacts
      parameters:
      - name: category
        in: query
        description: Restrict to a single category (e.g. `science`, `history`).
        required: false
        schema:
          type: string
          example: science
      - name: limit
        in: query
        description: Max facts to return. Clamped to 50.
        required: false
        schema:
          type: integer
          minimum: 1
          maximum: 50
          default: 10
      - name: min_tier
        in: query
        description: 'Minimum verification tier. `gold` is strictest. The effective floor

          is the stricter of the request and the caller''s plan.

          '
        required: false
        schema:
          type: string
          enum:
          - gold
          - silver
          - bronze
          - unverified
      - name: include_unverified
        in: query
        description: 'Only honored for scale/enterprise callers. When `true`, unverified

          facts may appear in the result set.

          '
        required: false
        schema:
          type: boolean
          default: false
      responses:
        '200':
          description: Facts list
          headers:
            X-DeepInquiry-Min-Tier:
              $ref: '#/components/headers/MinTierHeader'
            X-Quota-Remaining:
              $ref: '#/components/headers/QuotaRemainingHeader'
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/FactList'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '429':
          $ref: '#/components/responses/RateLimited'
        '500':
          $ref: '#/components/responses/InternalError'
  /v1/facts/{id}:
    get:
      tags:
      - Facts
      summary: Get a fact by ID with source clusters
      description: 'Returns a single approved fact plus the full audit trail: every

        source cluster that voted on it, with cluster ID, origin type,

        and member URLs.'
      operationId: getFact
      parameters:
      - name: id
        in: path
        required: true
        schema:
          type: integer
          minimum: 1
      responses:
        '200':
          description: Fact detail
          headers:
            X-DeepInquiry-Verification-Tier:
              $ref: '#/components/headers/VerificationTierHeader'
            X-DeepInquiry-Independence-Score:
              $ref: '#/components/headers/IndependenceScoreHeader'
            X-Quota-Remaining:
              $ref: '#/components/headers/QuotaRemainingHeader'
          content:
            application/json:
              schema:
                type: object
                required:
                - fact
                properties:
                  fact:
                    $ref: '#/components/schemas/FactWithClusters'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
        '429':
          $ref: '#/components/responses/RateLimited'
        '500':
          $ref: '#/components/responses/InternalError'
  /v1/facts/random:
    get:
      tags:
      - Facts
      summary: Get one random approved fact
      description: 'Returns a single approved fact chosen at random, respecting the

        caller''s plan tier floor.'
      operationId: randomFact
      responses:
        '200':
          description: Random fact
          headers:
            X-DeepInquiry-Verification-Tier:
              $ref: '#/components/headers/VerificationTierHeader'
            X-Quota-Remaining:
              $ref: '#/components/headers/QuotaRemainingHeader'
          content:
            application/json:
              schema:
                type: object
                required:
                - fact
                properties:
                  fact:
                    $ref: '#/components/schemas/Fact'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
        '429':
          $ref: '#/components/responses/RateLimited'
        '500':
          $ref: '#/components/responses/InternalError'
components:
  schemas:
    Fact:
      type: object
      required:
      - id
      - fact_text
      - category
      properties:
        id:
          type: integer
          example: 1234
        fact_text:
          type: string
          example: An adult octopus has three hearts.
        category:
          type: string
          example: science
        era:
          type:
          - string
          - 'null'
          example: present day
        region:
          type:
          - string
          - 'null'
          example: global
        surprise_score:
          type:
          - number
          - 'null'
          format: float
          minimum: 0
          maximum: 1
        confidence_level:
          type:
          - string
          - 'null'
          example: high
        verification_tier:
          type:
          - string
          - 'null'
          enum:
          - gold
          - silver
          - bronze
          - unverified
        independence_score:
          type:
          - number
          - 'null'
          format: float
          minimum: 0
          maximum: 1
        cluster_count:
          type:
          - integer
          - 'null'
          minimum: 0
        citogenesis_flags:
          type:
          - array
          - 'null'
          items:
            type: string
          description: Non-empty when the verification pipeline detected signs that the supporting sources copied one another.
        claim_tier:
          type:
          - string
          - 'null'
          description: Type/strength of claim (e.g. "definitional", "empirical").
        tags:
          type:
          - array
          - 'null'
          items:
            type: string
        similarity:
          type:
          - number
          - 'null'
          format: float
          minimum: 0
          maximum: 1
          description: Present only on /v1/search responses.
        source_notes:
          type:
          - array
          - 'null'
          items:
            type: string
          description: 'Information only: weaker copies (for example a Wikipedia page or an aggregator) that were set aside because sources of another kind exist.'
    Meta:
      type: object
      properties:
        min_tier:
          type: string
          enum:
          - gold
          - silver
          - bronze
          - unverified
        include_unverified:
          type: boolean
        returned:
          type: integer
        query:
          type: string
          description: Present only on /v1/search responses.
        model:
          type: string
          description: Present only on /v1/search responses.
    FactList:
      type: object
      required:
      - facts
      - meta
      properties:
        facts:
          type: array
          items:
            $ref: '#/components/schemas/Fact'
        meta:
          $ref: '#/components/schemas/Meta'
    SourceCluster:
      type: object
      required:
      - cluster_id
      - origin_type
      - member_urls
      properties:
        cluster_id:
          type: string
        origin_type:
          type: string
          description: e.g. "primary", "secondary", "tertiary"
        member_urls:
          type: array
          items:
            type: string
            format: uri
    Error:
      type: object
      required:
      - error
      properties:
        error:
          type: object
          required:
          - code
          - message
          properties:
            code:
              type: string
              description: Stable machine-readable error code (e.g. `bad_request`, `unauthorized`, `forbidden`, `not_found`, `rate_limited`, `internal_error`)
              example: bad_request
            message:
              type: string
              description: Human-readable error description
              example: limit must be between 1 and 25
            request_id:
              type: string
              description: Server-assigned request identifier for support triage
              example: req_abc123def456
    FactWithClusters:
      allOf:
      - $ref: '#/components/schemas/Fact'
      - type: object
        properties:
          source_clusters:
            type: array
            items:
              $ref: '#/components/schemas/SourceCluster'
  responses:
    InternalError:
      description: Unexpected server error
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
          example:
            error:
              code: internal_error
              message: an unexpected error occurred
              request_id: req_abc123def456
    RateLimited:
      description: Caller's plan quota exceeded
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
          example:
            error:
              code: rate_limited
              message: monthly quota exhausted
              request_id: req_abc123def456
    BadRequest:
      description: Request validation failed (missing, malformed, or out-of-range parameters)
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
          example:
            error:
              code: bad_request
              message: limit must be between 1 and 25
              request_id: req_abc123def456
    Forbidden:
      description: Caller not permitted to request that tier or option
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
          example:
            error:
              code: forbidden
              message: your plan cannot request bronze facts; choose a plan that includes them
              request_id: req_abc123def456
    Unauthorized:
      description: Missing or invalid credential
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
          example:
            error:
              code: unauthorized
              message: x-api-key header missing or invalid
              request_id: req_abc123def456
    NotFound:
      description: The requested fact or resource does not exist or is not approved
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
          example:
            error:
              code: not_found
              message: fact id 999999 not found or not approved
              request_id: req_abc123def456
  headers:
    MinTierHeader:
      description: Effective minimum verification tier applied to this response.
      schema:
        type: string
        enum:
        - gold
        - silver
        - bronze
        - unverified
    VerificationTierHeader:
      description: The verification tier of the returned fact.
      schema:
        type: string
        enum:
        - gold
        - silver
        - bronze
        - unverified
    QuotaRemainingHeader:
      description: Remaining requests in the caller's current billing window.
      schema:
        type: integer
        minimum: 0
    IndependenceScoreHeader:
      description: 0.0-1.0. 1.0 is the top of the scale; it does not mean the evidence is independent.
      schema:
        type: number
        format: float
        minimum: 0
        maximum: 1
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: x-api-key