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OpenAPI Specification

openapi: 3.2.0
info:
  title: Fathom Analytics REST Account Milestones API
  description: 'Privacy-first, GDPR-compliant, cookie-free website analytics API. Manage sites, events, and milestones; generate aggregated custom reports; and retrieve real-time visitor counts. Authentication uses Bearer token API keys generated in the account settings area.

    '
  version: '1'
  contact:
    name: Fathom Analytics Support
    email: support@usefathom.com
  termsOfService: https://usefathom.com/terms
  license:
    name: Proprietary
servers:
- url: https://api.usefathom.com/v1
  description: Fathom Analytics API v1
security:
- BearerAuth: []
tags:
- name: Milestones
  description: Milestone management per site
paths:
  /sites/{site_id}/milestones:
    get:
      operationId: listMilestones
      summary: List milestones
      description: Returns a paginated list of milestones for a site.
      tags:
      - Milestones
      parameters:
      - $ref: '#/components/parameters/SiteId'
      - $ref: '#/components/parameters/Limit'
      - $ref: '#/components/parameters/StartingAfter'
      - $ref: '#/components/parameters/EndingBefore'
      responses:
        '200':
          description: Paginated list of milestones
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MilestoneList'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    post:
      operationId: createMilestone
      summary: Create milestone
      description: Creates a new milestone for a site.
      tags:
      - Milestones
      parameters:
      - $ref: '#/components/parameters/SiteId'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/MilestoneCreate'
      responses:
        '200':
          description: Created milestone object
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Milestone'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /sites/{site_id}/milestones/{milestone_id}:
    get:
      operationId: getMilestone
      summary: Get milestone
      description: Returns a single milestone by ID.
      tags:
      - Milestones
      parameters:
      - $ref: '#/components/parameters/SiteId'
      - $ref: '#/components/parameters/MilestoneId'
      responses:
        '200':
          description: Milestone object
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Milestone'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    post:
      operationId: updateMilestone
      summary: Update milestone
      description: Updates a milestone's name or date.
      tags:
      - Milestones
      parameters:
      - $ref: '#/components/parameters/SiteId'
      - $ref: '#/components/parameters/MilestoneId'
      requestBody:
        required: false
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/MilestoneUpdate'
      responses:
        '200':
          description: Updated milestone object
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Milestone'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    delete:
      operationId: deleteMilestone
      summary: Delete milestone
      description: Permanently deletes a milestone.
      tags:
      - Milestones
      parameters:
      - $ref: '#/components/parameters/SiteId'
      - $ref: '#/components/parameters/MilestoneId'
      responses:
        '200':
          description: Empty object on success
          content:
            application/json:
              schema:
                type: object
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
components:
  parameters:
    SiteId:
      name: site_id
      in: path
      required: true
      description: Unique identifier for the site.
      schema:
        type: string
    Limit:
      name: limit
      in: query
      required: false
      description: Number of results per page (1-100, default 10).
      schema:
        type: integer
        minimum: 1
        maximum: 100
        default: 10
    EndingBefore:
      name: ending_before
      in: query
      required: false
      description: Cursor for backward pagination — return results before this ID.
      schema:
        type: string
    MilestoneId:
      name: milestone_id
      in: path
      required: true
      description: Unique identifier for the milestone.
      schema:
        type: string
    StartingAfter:
      name: starting_after
      in: query
      required: false
      description: Cursor for forward pagination — return results after this ID.
      schema:
        type: string
  schemas:
    Error:
      type: object
      properties:
        error:
          type: string
          description: Human-readable error message.
      required:
      - error
    Milestone:
      type: object
      properties:
        id:
          type: string
          description: Unique milestone identifier.
        object:
          type: string
          example: milestone
        name:
          type: string
          description: Milestone display name.
        milestone_date:
          type: string
          format: date
          description: Date of the milestone (YYYY-MM-DD).
        created_at:
          type: string
          format: date-time
        updated_at:
          type: string
          format: date-time
    MilestoneUpdate:
      type: object
      properties:
        name:
          type: string
        milestone_date:
          type: string
          format: date
    MilestoneCreate:
      type: object
      required:
      - name
      - milestone_date
      properties:
        name:
          type: string
          description: Display name for the milestone.
        milestone_date:
          type: string
          format: date
          description: Date of the milestone (YYYY-MM-DD).
    MilestoneList:
      type: object
      properties:
        object:
          type: string
          example: list
        data:
          type: array
          items:
            $ref: '#/components/schemas/Milestone'
        has_more:
          type: boolean
  responses:
    BadRequest:
      description: Bad request
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    NotFound:
      description: Resource not found
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    Unauthorized:
      description: Missing or invalid API key
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      description: API key generated in account settings at https://app.usefathom.com/api