Ledger Investing Triangles API

openapi: 3.1.0
info:
  title: Ledger Analytics Cashflow Models Triangles API
  version: 0.0.30
  summary: Remote Bayesian actuarial compute over insurance loss triangles.
  description: 'The Ledger Analytics API provides remote compute access to Bayesian actuarial models

    for insurance loss triangles. It is operated by Korra Tech, LLC (d/b/a Korra), a wholly

    owned SaaS subsidiary of Ledger Investing, Inc., and is currently in beta.


    Loss triangles are uploaded and managed as first-class `triangle` resources. Development,

    tail, forecast and cashflow models are then fit against a named triangle. Fitting and

    prediction are executed as asynchronous remote tasks: the fit/predict call returns a task

    handle which is polled at `/tasks/{task_id}` until it completes; predictions are written

    back as new triangle resources.


    IMPORTANT PROVENANCE NOTE: Ledger/Korra do not publish an OpenAPI description. This

    document was DERIVED by API Evangelist from the request construction in the first-party,

    open-source `ledger-analytics` Python client (github.com/LedgerInvesting/ledger-analytics,

    MIT-licensed, Copyright 2025 Korra, LLC) and from the published documentation. Paths,

    methods, auth, request-body field names, pagination parameters and error semantics are

    taken verbatim from that client. Response schemas are partial — only the fields the

    client actually reads are described. It is not an authoritative provider artifact.

    '
  contact:
    name: Ledger Analytics
    email: analytics@ledgerinvesting.com
    url: https://ledger-investing-ledger-analytics.readthedocs-hosted.com/en/stable/index.html
  license:
    name: MIT
    url: https://github.com/LedgerInvesting/ledger-analytics/blob/main/LICENSE.txt
servers:
- url: https://api.korra.com/analytics
  description: Production
security:
- ApiKeyAuth: []
tags:
- name: Triangles
  description: Upload, list, retrieve and delete insurance loss triangles.
paths:
  /triangle:
    get:
      tags:
      - Triangles
      operationId: listTriangles
      summary: List triangles
      description: Returns a paginated list of loss triangles belonging to the authenticated account.
      parameters:
      - $ref: '#/components/parameters/Limit'
      responses:
        '200':
          description: Paginated list of triangles.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PaginatedTriangleList'
        '403':
          $ref: '#/components/responses/Forbidden'
        '500':
          $ref: '#/components/responses/InternalServerError'
    post:
      tags:
      - Triangles
      operationId: createTriangle
      summary: Create a triangle
      description: 'Uploads a loss triangle. `triangle_data` is the Bermuda triangle dictionary

        representation (`bermuda.Triangle.to_dict()`). Set `overwrite` to replace an

        existing triangle of the same name — the upsert semantic used by the client''s

        `get_or_create` / `get_or_update` helpers.

        '
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/TriangleCreateRequest'
      responses:
        '201':
          description: Triangle created.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Triangle'
        '400':
          $ref: '#/components/responses/BadRequest'
        '403':
          $ref: '#/components/responses/Forbidden'
        '500':
          $ref: '#/components/responses/InternalServerError'
  /triangle/{id}:
    parameters:
    - $ref: '#/components/parameters/ResourceId'
    get:
      tags:
      - Triangles
      operationId: getTriangle
      summary: Retrieve a triangle
      description: 'Retrieves a triangle by id. For large triangles the response carries a `url`

        field with a pre-signed download location instead of an inline `triangle_data`

        payload; the client follows that URL and streams the content.

        '
      responses:
        '200':
          description: The triangle.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Triangle'
        '404':
          $ref: '#/components/responses/NotFound'
        '403':
          $ref: '#/components/responses/Forbidden'
    delete:
      tags:
      - Triangles
      operationId: deleteTriangle
      summary: Delete a triangle
      responses:
        '204':
          description: Triangle deleted.
        '404':
          $ref: '#/components/responses/NotFound'
        '403':
          $ref: '#/components/responses/Forbidden'
components:
  parameters:
    ResourceId:
      name: id
      in: path
      required: true
      description: Identifier of the resource.
      schema:
        type: string
    Limit:
      name: limit
      in: query
      required: false
      description: Maximum number of results to return per page.
      schema:
        type: integer
        default: 25
        minimum: 1
  responses:
    Forbidden:
      description: Forbidden — the API key does not have permission to perform this action.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    NotFound:
      description: Not found — the endpoint or resource does not exist.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    BadRequest:
      description: Bad request — the payload was rejected.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    InternalServerError:
      description: Internal server error.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  schemas:
    Triangle:
      type: object
      description: An insurance loss triangle resource.
      properties:
        id:
          type: string
          description: Triangle identifier.
        name:
          type: string
          description: Triangle name, unique per account.
        triangle_data:
          type: object
          description: Bermuda triangle dictionary representation.
          additionalProperties: true
        url:
          type:
          - string
          - 'null'
          format: uri
          description: Pre-signed download URL returned in place of inline data for large triangles.
    Pagination:
      type: object
      properties:
        count:
          type: integer
          description: Total number of matching objects.
        next:
          type:
          - string
          - 'null'
          description: URL of the next page, when present.
        previous:
          type:
          - string
          - 'null'
          description: URL of the previous page, when present.
    Error:
      type: object
      description: 'Error envelope. The client surfaces the decoded JSON body verbatim in the raised

        HTTPError message; the exact field names are not documented by the provider.

        '
      additionalProperties: true
    PaginatedTriangleList:
      allOf:
      - $ref: '#/components/schemas/Pagination'
      - type: object
        properties:
          results:
            type: array
            items:
              $ref: '#/components/schemas/Triangle'
    TriangleCreateRequest:
      type: object
      required:
      - triangle_name
      - triangle_data
      properties:
        triangle_name:
          type: string
          description: Name to store the triangle under.
        triangle_data:
          type: object
          description: Bermuda triangle dictionary representation (`bermuda.Triangle.to_dict()`).
          additionalProperties: true
        overwrite:
          type: boolean
          default: false
          description: Replace an existing triangle of the same name.
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: Authorization
      description: 'API key credential sent as `Authorization: Api-Key <API_KEY>`. Keys are requested by

        emailing analytics@ledgerinvesting.com during the beta and managed at https://ldgr.app/api-keys.

        The Python client reads the key from the `LEDGER_ANALYTICS_API_KEY` environment variable.

        '
externalDocs:
  description: LedgerAnalytics Python documentation
  url: https://ledger-investing-ledger-analytics.readthedocs-hosted.com/en/stable/index.html