> ## Documentation Index > Fetch the complete documentation index at: https://docs.apistable.com/llms.txt > Use this file to discover all available pages before exploring further. # Get a quote > See eligible channel prices and the maximum credit reservation. > API preview: generation providers are not connected. An authenticated request can return 503 without creating a task or charging credits. ## Quote the complete input The server normalizes defaults, filters incompatible channels, and applies each remaining channel’s pricing formula. Duration, resolution, audio, quality, and output\_count may all change the total. The maximum reservation covers one successful route per result item, not the sum of every possible failed attempt. A quote is an estimate of accepted limits, not a promise that a preview model will run. ## Understand the upper bound ```bash theme={null} { "is_preview": true, "model": "prism-image-2", "input": { "prompt": "A sculptural chair in warm afternoon light", "resolution": "1024" }, "output_count": 4, "estimated_credits": 80, "max_reserved_credits": 240, "channel_quotes": [ { "channel_type": "third_party", "credits": 80 }, { "channel_type": "official", "credits": 240 } ], "price_version": "preview-2026-10-29", "live_available": false } ``` > channel\_quotes\[].credits is the total for the whole batch on that route, not a per-item price. This endpoint returns an unreserved preview estimate, not a quote\_id or a locked purchase offer. ## Set max\_credits max\_credits is your cap for the entire request. If the server’s maximum reservation is higher, it rejects the whole submission before any generation. It does not silently reduce output\_count or divide a smaller budget between items. ## OpenAPI ````yaml openapi.json POST /v1/quotes openapi: 3.1.0 info: title: APIstable API preview version: 0.1.0-preview description: >- Current implemented HTTP surface. / 当前已实现的 HTTP 接口。 Models and quote prices are illustrative. Real providers and paid generation are not connected. POST /v1/tasks and /v1/chat/completions return 503 provider_not_configured after authentication and applicable validation; no credits are reserved or charged. Live 202 acceptance, provider callbacks, SSE, idempotent task creation, and full model capability adapters remain future integration work. Website login sessions are separate from application API keys. servers: - url: https://apistable.com description: APIstable API security: [] tags: - name: Models - name: Quotes - name: Tasks - name: Credits - name: LLM paths: /v1/quotes: post: tags: - Quotes summary: Validate input and estimate credits / 校验与估价 description: >- Public, nonbinding preview estimate. No credits are reserved, no task is created, and no quote_id is issued. Unknown parameters are rejected. Inputs are checked against the current illustrative model catalog; full live supplier compatibility is not yet active. channel_quotes[].credits is the entire batch total for that route. operationId: createQuote requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/TaskRequest' responses: '200': description: Preview quote content: application/json: schema: $ref: '#/components/schemas/Quote' '400': description: >- validation_error, unsupported_parameter, invalid_output_count, unsupported_resolution, or unsupported_duration content: application/json: schema: $ref: '#/components/schemas/Error' '404': description: model_not_found content: application/json: schema: $ref: '#/components/schemas/Error' '413': description: payload_too_large content: application/json: schema: $ref: '#/components/schemas/Error' '422': description: credit_limit_exceeded content: application/json: schema: $ref: '#/components/schemas/Error' '503': description: model_unavailable or service_unavailable content: application/json: schema: $ref: '#/components/schemas/Error' security: [] components: schemas: TaskRequest: type: object additionalProperties: false required: - model - input properties: model: type: string minLength: 1 example: prism-image-2 input: $ref: '#/components/schemas/GenerationInput' output_count: type: integer minimum: 1 maximum: 4 default: 1 description: >- Target result count. Images/videos accept 1–4; music and LLM must remain 1. Not a concurrency guarantee. / 目标结果数，非同时并发保证。 fallback: type: boolean default: false description: >- Authorizes a higher-priced compatible official fallback after an eligible confirmed failure. Live execution is disabled in this build. max_credits: type: integer minimum: 0 description: >- Whole-request reservation cap. Reject the entire request when max_reserved_credits exceeds it. Quote: type: object required: - is_preview - model - input - output_count - estimated_credits - max_reserved_credits - channel_quotes - price_version - live_available properties: is_preview: const: true model: type: string input: $ref: '#/components/schemas/GenerationInput' output_count: type: integer minimum: 1 maximum: 4 estimated_credits: type: number minimum: 0 description: Credits, not USD. / 积分，非美元。 max_reserved_credits: type: number minimum: 0 description: Credits, not USD. / 积分，非美元。 channel_quotes: type: array items: type: object required: - channel_type - credits properties: channel_type: type: string enum: - third_party - official credits: type: number minimum: 0 description: Whole-batch total using this channel. / 整批渠道总积分。 price_version: type: string live_available: const: false Error: type: object required: - error properties: error: type: object required: - code - message properties: code: type: string message: type: string GenerationInput: type: object additionalProperties: false required: - prompt description: >- Current preview input. Supported fields vary by modality and exact catalog model. No live provider mapping is implied. properties: prompt: type: string minLength: 1 maxLength: 4000 duration_seconds: type: integer description: Video-only; must match the model duration list. resolution: type: string description: Must match the model resolution list. aspect_ratio: type: string enum: - '16:9' - '9:16' - '1:1' - '4:3' seed: type: integer minimum: 0 generate_audio: type: boolean description: Video only, subject to model support. instrumental: type: boolean description: Music only. lyrics: type: string maxLength: 5000 description: Music only. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.