fal Serverless Platform API

openapi: 3.1.0
info:
  title: fal Serverless Platform API
  description: >
    Platform control-plane endpoints for managing fal Serverless applications —
    custom GPU functions and apps deployed using `@fal.function`, `fal.App`, or
    bring-your-own containers. Covers app metadata, scaling, secrets, files,
    and execution analytics. This API backs the `fal` CLI (`fal apps list`,
    `fal secrets`, `fal deploy`).
  version: 'v1'
  contact:
    name: fal Support
    url: https://fal.ai/support
  license:
    name: fal Terms of Service
    url: https://fal.ai/legal/terms-of-service

servers:
  - url: https://rest.alpha.fal.ai
    description: fal REST control-plane

security:
  - FalKeyAuth: []

tags:
  - name: Apps
    description: List and inspect deployed Serverless apps.
  - name: Secrets
    description: Manage per-org secrets injected into Serverless runs.
  - name: Files
    description: Manage files on persistent Serverless `/data` volumes.

paths:
  /serverless/apps:
    get:
      summary: List Serverless Apps
      description: Return every Serverless app deployed under the calling key's organization.
      operationId: listApps
      tags:
        - Apps
      responses:
        '200':
          description: Apps owned by the organization.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/ServerlessApp'
              examples:
                Apps:
                  $ref: '#/components/examples/AppsExample'
        '401':
          $ref: '#/components/responses/Unauthorized'

  /serverless/apps/{app_id}:
    get:
      summary: Get Serverless App
      description: Retrieve metadata, endpoint URL, and current scaling parameters for an app.
      operationId: getApp
      tags:
        - Apps
      parameters:
        - $ref: '#/components/parameters/AppId'
      responses:
        '200':
          description: App detail.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ServerlessApp'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'

  /serverless/secrets:
    get:
      summary: List Serverless Secrets
      description: Return secret names available to all Serverless apps in the calling org. Values are never returned.
      operationId: listSecrets
      tags:
        - Secrets
      responses:
        '200':
          description: Secret names.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Secret'
        '401':
          $ref: '#/components/responses/Unauthorized'
    post:
      summary: Set Serverless Secret
      description: Create or replace a named secret injected as an env var into Serverless runs.
      operationId: setSecret
      tags:
        - Secrets
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SecretWrite'
      responses:
        '200':
          description: Secret saved.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Secret'
        '401':
          $ref: '#/components/responses/Unauthorized'

  /serverless/files:
    get:
      summary: List Serverless Files
      description: List files on the persistent `/data` volume mounted into Serverless runs.
      operationId: listFiles
      tags:
        - Files
      parameters:
        - name: path
          in: query
          required: false
          description: Subdirectory path under `/data` to list.
          schema:
            type: string
      responses:
        '200':
          description: File listing.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/FileEntry'

components:
  securitySchemes:
    FalKeyAuth:
      type: apiKey
      in: header
      name: Authorization
      description: 'Pass the fal API key as `Authorization: Key $FAL_KEY`.'

  parameters:
    AppId:
      name: app_id
      in: path
      required: true
      description: Serverless app identifier (e.g. `my-org/my-flux-finetune`).
      schema:
        type: string

  schemas:
    ServerlessApp:
      type: object
      required: [id, name, endpoint]
      properties:
        id:
          type: string
        name:
          type: string
        endpoint:
          type: string
          format: uri
          description: Invocation URL for the app.
        gpu:
          type: string
          description: GPU class (e.g. `H100`, `A100`).
        keep_alive:
          type: integer
          description: Seconds a warm worker is kept after the last request.
        min_concurrency:
          type: integer
        max_concurrency:
          type: integer
        public:
          type: boolean

    Secret:
      type: object
      required: [name]
      properties:
        name:
          type: string
        created_at:
          type: string
          format: date-time

    SecretWrite:
      type: object
      required: [name, value]
      properties:
        name:
          type: string
        value:
          type: string
          format: password

    FileEntry:
      type: object
      properties:
        path:
          type: string
        size:
          type: integer
        modified_at:
          type: string
          format: date-time

    ErrorResponse:
      type: object
      properties:
        detail:
          type: string

  responses:
    Unauthorized:
      description: Missing or invalid API key.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    NotFound:
      description: App or resource not found.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'

  examples:
    AppsExample:
      summary: Two deployed apps
      value:
        - id: my-org/flux-finetune
          name: flux-finetune
          endpoint: https://fal.run/my-org/flux-finetune
          gpu: H100
          keep_alive: 60
          min_concurrency: 0
          max_concurrency: 8
          public: false
        - id: my-org/sdxl-lcm
          name: sdxl-lcm
          endpoint: https://fal.run/my-org/sdxl-lcm
          gpu: A100
          keep_alive: 120
          min_concurrency: 1
          max_concurrency: 16
          public: true