> ## Documentation Index > Fetch the complete documentation index at: https://docs.kleep.ai/llms.txt > Use this file to discover all available pages before exploring further. # Get product sizing > Whether Kleep can size the product, its sizes, how it fits ("does it run small?") and, with `include=questions`, the questions to ask. No shopper data needed. Call it when the conversation turns to a product. ## OpenAPI ````yaml /partners/openapi.json get /products/{product_id}/sizing openapi: 3.0.3 info: title: Kleep Partner API version: 1.0.0 description: >- Size recommendations for conversational agents: customer-service agents, AI shopping assistants and AI agents, on behalf of Kleep retailers. servers: - url: https://fit.kleep.ai/v1 description: Production security: - bearerAuth: [] paths: /products/{product_id}/sizing: get: summary: Get product sizing description: >- Whether Kleep can size the product, its sizes, how it fits ("does it run small?") and, with `include=questions`, the questions to ask. No shopper data needed. Call it when the conversation turns to a product. operationId: getProductSizing parameters: - name: Kleep-Retailer in: header required: true schema: type: string format: uuid description: >- The retailer's Kleep `public_id`. Every call is scoped to one retailer. - name: product_id in: path required: true schema: type: string description: The retailer's product ID, as in its catalog. - name: include in: query schema: type: string enum: - questions description: Add the questions that apply to this product. - name: locale in: query schema: type: string default: en description: BCP 47 language tag for prompts and sentences, for example `fr-FR`. - name: market in: query schema: type: string description: ISO 3166-1 alpha-2 country, for market-specific size labels. responses: '200': description: Product sizing. content: application/json: schema: $ref: '#/components/schemas/ProductSizing' example: product_id: JEAN-0142 supported: true category: clothing sizes: - label: S variant_id: JEAN-0142-S available: true - label: M variant_id: JEAN-0142-M available: true - label: L variant_id: JEAN-0142-L available: false product_fit: tendency: runs_small score: -0.4 summary: >- This style runs slightly small: most shoppers take one size up. '401': description: Missing or invalid API key. content: application/json: schema: $ref: '#/components/schemas/Error' example: error: code: unauthorized message: Invalid API key '403': description: This retailer has not enabled your integration. content: application/json: schema: $ref: '#/components/schemas/Error' example: error: code: retailer_not_enabled message: Retailer 9b1f… has not enabled this partner '404': description: The product is not in the retailer's catalog. content: application/json: schema: $ref: '#/components/schemas/Error' example: error: code: product_not_found message: No product JEAN-9999 for this retailer '429': description: >- Rate limit reached. Retry after the number of seconds in `Retry-After`. content: application/json: schema: $ref: '#/components/schemas/Error' example: error: code: rate_limited message: Too many requests components: schemas: ProductSizing: type: object required: - product_id - supported properties: product_id: type: string supported: type: boolean description: >- `true` when Kleep can recommend a size for this product. Offer size help only then. category: $ref: '#/components/schemas/Category' sizes: type: array items: $ref: '#/components/schemas/Size' description: The product's sizes, in size order. product_fit: $ref: '#/components/schemas/ProductFit' questions: type: array items: $ref: '#/components/schemas/Question' description: >- Questions that apply to this product, when `include=questions` is set. Error: type: object required: - error properties: error: type: object required: - code - message properties: code: type: string enum: - unauthorized - retailer_not_enabled - invalid_input - missing_inputs - product_not_found - product_not_supported - profile_not_found - recommendation_not_found - rate_limited - internal_error description: >- Stable, machine-readable error code. Branch on this, not on `message`. message: type: string description: >- Human-readable explanation, in English. Not meant to be shown to shoppers. missing: type: array items: type: string description: '`missing_inputs` only: the ids of the answers still needed.' questions: type: array items: $ref: '#/components/schemas/Question' description: >- `missing_inputs` only: the questions to ask for the missing answers, localized. details: type: object additionalProperties: true description: '`invalid_input` only: the offending fields.' Category: type: string enum: - clothing - lingerie - footwear - kids description: Sizing category of the product. It decides which questions apply. Size: type: object required: - label - variant_id properties: label: type: string description: >- Size label as the retailer displays it in this market, for example `M`, `38` or `32 Long`. variant_id: type: string description: >- The retailer's variant ID for this size, as in its catalog: use it to add to cart. available: type: boolean description: '`true` when the variant is in stock.' ProductFit: type: object nullable: true description: >- How the product fits compared to its size chart, from Kleep's purchase and return data. `null` when there isn't enough data. properties: tendency: type: string enum: - runs_very_small - runs_small - true_to_size - runs_large - runs_very_large score: type: number minimum: -1 maximum: 1 description: >- Same signal as a number: -1 runs very small, 0 true to size, 1 runs very large. summary: type: string description: Ready-to-say sentence in the requested locale. Question: type: object required: - id - required - type - prompt properties: id: type: string description: >- Path of the answer in `measurements`, for example `height_cm` or `body_shape.hips`. required: type: boolean type: type: string enum: - choice - number - integer - text prompt: type: string description: >- Ready-to-ask wording in the requested locale. Rephrase freely to match your bot's tone. unit: type: string enum: - cm - kg min: type: number max: type: number default: type: string description: Value Kleep assumes when an optional question is skipped. options: type: array items: type: object properties: value: type: string label: type: string securitySchemes: bearerAuth: type: http scheme: bearer description: >- Your partner API key: `kp_live_…` in production, `kp_test_…` on the sandbox retailer. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.