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OpenAPI Specification

openapi: 3.2.0
info:
  title: Statsig HTTP Configuration API
  description: The Statsig HTTP API allows developers to evaluate feature gates, dynamic configs, and experiments for users via server-side HTTP requests.
  version: 1.0.0
  contact:
    name: Statsig Support
    url: https://statsig.com/support
  termsOfService: https://statsig.com/terms
servers:
- url: https://api.statsig.com/v1
  description: Statsig API Server
security:
- statsigApiKey: []
tags:
- name: Configuration
  description: Endpoints for downloading full project configuration specs for server-side local evaluation.
paths:
  /download_config_specs:
    post:
      operationId: downloadConfigSpecs
      summary: Download configuration specs
      description: Downloads the full project configuration for server-side local evaluation. This endpoint is used by server SDKs to retrieve all gate, config, experiment, and layer definitions for evaluating locally without per-request network calls. This enables sub-millisecond feature gate checks.
      tags:
      - Configuration
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                sinceTime:
                  type: integer
                  format: int64
                  description: Timestamp of the last successful download, used for incremental updates.
      responses:
        '200':
          description: Full project configuration specs
          content:
            application/json:
              schema:
                type: object
                properties:
                  dynamic_configs:
                    type: array
                    items:
                      type: object
                    description: Array of dynamic config and experiment specifications.
                  feature_gates:
                    type: array
                    items:
                      type: object
                    description: Array of feature gate specifications.
                  layer_configs:
                    type: array
                    items:
                      type: object
                    description: Array of layer specifications.
                  has_updates:
                    type: boolean
                    description: Whether the response contains updates since sinceTime.
                  time:
                    type: integer
                    format: int64
                    description: Server timestamp of this configuration snapshot.
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  responses:
    Unauthorized:
      description: Missing or invalid API key
      content:
        application/json:
          schema:
            type: object
            properties:
              message:
                type: string
                description: Error message describing the authentication failure.
  securitySchemes:
    statsigApiKey:
      type: apiKey
      in: header
      name: statsig-api-key
      description: API key for authentication. Use a Server Secret Key for secure server-side requests or a Client-SDK Key for client-side applications.
externalDocs:
  description: Statsig HTTP API Documentation
  url: https://docs.statsig.com/http-api/