> ## Documentation Index > Fetch the complete documentation index at: https://help.onetsolutions.net/llms.txt > Use this file to discover all available pages before exploring further. # [Web Hosting] Price a plan change before ordering it > Return what a plan change would cost without creating an order or an invoice. Includes the prorated product price, the price of the config options carried over to the new plan, the resulting total, the billing cycle it would be billed on, and the longer cycles the customer may switch to. Options with no equivalent are listed apart. ## OpenAPI ````yaml https://api.onetsolutions.net/schema post /v1/organizations/{organization_id}/projects/{project_id}/hosting/{id}/change-plan-preview openapi: 3.0.3 info: title: OnetSolutions API version: v1 (v1) description: > ## Overview The OnetSolutions API provides programmatic access to manage your cloud infrastructure, domains, and web hosting services. ## Authentication All API requests require authentication using one of the following methods: - **JWT Token**: Obtain a token via login endpoints and include it in the `Authorization: Bearer ` header - **API Key**: Generate an API key from your account settings and use it as `Authorization: Bearer sk-onetsolutions-...` ## Rate Limiting API requests are rate-limited to ensure fair usage: - **Standard**: 1000 requests per minute - **Burst**: 100 requests per second ## Pagination List endpoints return paginated results. Use `page` and `page_size` query parameters. ## Error Handling The API uses standard HTTP status codes: - `200` Success - `201` Created - `400` Bad Request - `401` Unauthorized - `403` Forbidden - `404` Not Found - `429` Too Many Requests servers: - url: https://api.onetsolutions.net description: Production security: [] tags: - name: Authentication description: >- Login, passwordless authentication, MFA, OAuth providers, and token management. - name: Organizations description: >- Organization management, members, roles, modules, audit logs, and notification settings. - name: Projects description: Project management, team members, and project-scoped resources. - name: Compute description: >- Cloud instances, volumes, snapshots, backups, VPCs, firewalls, SSH keys, uptime monitors, and instance tasks. - name: Billing description: >- Shopping cart, orders, invoices, payments, payment methods, gateways, promo codes, and balance management. - name: Domains description: >- Domain availability, registration, transfers, DNS zones, DNS records, and TLD information. - name: Web Hosting description: >- cPanel-based web hosting, emails, databases, subdomains, FTP accounts, addon domains, and SSL certificates. paths: /v1/organizations/{organization_id}/projects/{project_id}/hosting/{id}/change-plan-preview: post: tags: - Web Hosting summary: '[Web Hosting] Price a plan change before ordering it' description: >- Return what a plan change would cost without creating an order or an invoice. Includes the prorated product price, the price of the config options carried over to the new plan, the resulting total, the billing cycle it would be billed on, and the longer cycles the customer may switch to. Options with no equivalent are listed apart. operationId: preview_hosting_change_plan parameters: - in: path name: id schema: type: string format: uuid description: A UUID string identifying this Web Hosting. required: true - in: path name: organization_id schema: type: string format: uuid required: true - in: path name: project_id schema: type: string format: uuid required: true requestBody: content: application/json: schema: $ref: '#/components/schemas/HostingChangePlan' required: true responses: '200': content: application/json: schema: $ref: '#/components/schemas/HostingChangePlanPreview' description: Plan change quote '400': description: Invalid plan or the quote could not be produced '401': description: Authentication credentials missing or invalid '403': description: Insufficient permissions to access this service '404': description: Service or target plan not found security: - BearerAuth: [] components: schemas: HostingChangePlan: type: object properties: plan_id: type: string format: uuid billing_cycle: type: string nullable: true description: >- Cycle to bill the new plan on. Defaults to the current one; only a longer cycle is accepted. required: - plan_id HostingChangePlanPreview: type: object properties: product_price: type: string pattern: ^-?\d{0,10}(?:\.\d{0,2})?$ nullable: true config_options_price: type: string pattern: ^-?\d{0,10}(?:\.\d{0,2})?$ nullable: true total_price: type: string pattern: ^-?\d{0,10}(?:\.\d{0,2})?$ nullable: true currency: type: string billing_cycle: type: string available_billing_cycles: type: array items: type: string recurring_price: type: string pattern: ^-?\d{0,10}(?:\.\d{0,2})?$ nullable: true recurring_monthly_equivalent: type: string pattern: ^-?\d{0,10}(?:\.\d{0,2})?$ nullable: true monthly_reference_price: type: string pattern: ^-?\d{0,10}(?:\.\d{0,2})?$ nullable: true monthly_savings_percent: type: string pattern: ^-?\d{0,3}(?:\.\d{0,2})?$ nullable: true kept_options: type: array items: $ref: '#/components/schemas/HostingUpgradeConfigOption' dropped_options: type: array items: $ref: '#/components/schemas/HostingUpgradeConfigOption' required: - available_billing_cycles - billing_cycle - config_options_price - currency - dropped_options - kept_options - monthly_reference_price - monthly_savings_percent - product_price - recurring_monthly_equivalent - recurring_price - total_price HostingUpgradeConfigOption: type: object properties: option_name: type: string value_name: type: string required: - option_name - value_name securitySchemes: BearerAuth: type: http scheme: bearer bearerFormat: JWT or API Key description: >- Use `Authorization: Bearer ` header. Token can be a JWT token or an API key (format: `sk-onetsolutions-...`). ````