> ## Documentation Index > Fetch the complete documentation index at: https://docs.fuseai.com/llms.txt > Use this file to discover all available pages before exploring further. # A smart column's definition and run state > The column's stored definition and run state: its prompt, engine and any Deep Research provider restriction (`providerIds`, null when the column may use every provider), plus what a re-run would cost — `refreshableRowCount` rows (computed cells plus cells a cancelled run left pending or running) at `creditsPerRow` credits each — and `hasActiveJob`, true while a run is pending or processing (starting another run or editing the prompt cancels it). Only smart columns answer here; a plain custom column id is a 404. Free to call. Errors: - `404` `LIST_NOT_FOUND` — No list with that id belongs to you. - `404` `COLUMN_NOT_FOUND` — No smart column with that id is on this list (a plain custom column answers this too). - `422` `VALIDATION_FAILED` — The path, query or body failed validation; `param` names the offending field and `message` says why. - `429` `RATE_LIMITED` — More than 120 requests per minute or 10,000 per day on the lists bucket, which every /business/lists endpoint shares; retry after Retry-After. - `500` `UNEXPECTED_ERROR` — The request could not be completed; quote request_id to support. Requires one of the following token scopes: lists. ## OpenAPI ````yaml /openapi.json get /business/lists/{listId}/smart-columns/{columnId} openapi: 3.1.0 info: title: Fuse Business API version: 1.0.0 description: >- External API for lists, campaigns, prospect search and contacts. Authenticate with your API token as HTTP Basic. All paths are under /api/v1. servers: - url: https://api.tryfuse.ai/api/v1 description: Production security: - basicAuth: [] tags: - name: Lists - name: Custom columns - name: Smart columns - name: Exports - name: Campaigns - name: Knowledge hubs - name: Analytics - name: Website intent - name: Account - name: Prospect search - name: Campaign steps - name: Scheduled sends - name: Campaign templates - name: Agents - name: Research - name: Company search - name: Saved searches - name: Folders - name: Contacts paths: /business/lists/{listId}/smart-columns/{columnId}: get: tags: - Smart columns summary: A smart column's definition and run state description: >- The column's stored definition and run state: its prompt, engine and any Deep Research provider restriction (`providerIds`, null when the column may use every provider), plus what a re-run would cost — `refreshableRowCount` rows (computed cells plus cells a cancelled run left pending or running) at `creditsPerRow` credits each — and `hasActiveJob`, true while a run is pending or processing (starting another run or editing the prompt cancels it). Only smart columns answer here; a plain custom column id is a 404. Free to call. Errors: - `404` `LIST_NOT_FOUND` — No list with that id belongs to you. - `404` `COLUMN_NOT_FOUND` — No smart column with that id is on this list (a plain custom column answers this too). - `422` `VALIDATION_FAILED` — The path, query or body failed validation; `param` names the offending field and `message` says why. - `429` `RATE_LIMITED` — More than 120 requests per minute or 10,000 per day on the lists bucket, which every /business/lists endpoint shares; retry after Retry-After. - `500` `UNEXPECTED_ERROR` — The request could not be completed; quote request_id to support. Requires one of the following token scopes: lists. operationId: getSmartColumn parameters: - name: listId in: path required: true description: Id of the list that owns the smart column. schema: type: string description: Id of the list that owns the smart column. - name: columnId in: path required: true description: >- Id of the smart column, as returned when it was created or listed by GET /business/lists/{listId}/columns. schema: type: string description: >- Id of the smart column, as returned when it was created or listed by GET /business/lists/{listId}/columns. responses: '200': description: Success headers: RateLimit-Limit: schema: type: integer description: Requests permitted in the current window. RateLimit-Remaining: schema: type: integer description: Requests remaining in the current window. RateLimit-Reset: schema: type: integer description: Seconds until the current window resets. content: application/json: schema: type: object required: - column properties: column: type: object required: - id - name - prompt - engine - providerIds - refreshableRowCount - creditsPerRow - hasActiveJob properties: id: type: string description: Id of the column on the list. name: type: string description: Display name of the column. prompt: type: string description: The research instruction each row is computed from. engine: type: string enum: - standard - deep_research description: Engine that researches each row. providerIds: type: - array - 'null' items: type: string description: >- Deep Research provider slugs this column is restricted to; null when it may use every provider available to your workspace. refreshableRowCount: type: integer description: >- Rows a prompt edit or a `mode: all` rerun would recompute (upper bound). creditsPerRow: type: integer description: >- Credits charged per computed row: the rate of the latest run, or the engine's current rate if the column has not run yet. hasActiveJob: type: boolean description: True while a run is pending or processing. example: column: id: 68a1f3009c41d20014b3e9a1 name: Hiring signals prompt: >- Is this company hiring for sales roles right now? Answer yes or no and name the role. engine: deep_research providerIds: - exa - firecrawl refreshableRowCount: 100 creditsPerRow: 100 hasActiveJob: false '400': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '401': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '402': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '403': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '404': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '409': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '422': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '429': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '500': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' security: - basicAuth: [] components: schemas: Error: type: object properties: error: type: object properties: code: type: string message: type: string param: type: - string - 'null' doc_url: type: - string - 'null' request_id: type: - string - 'null' required: - code - message required: - error securitySchemes: basicAuth: type: http scheme: basic description: >- Your API token (`af_…`) as the Basic-auth username, with an empty password. ````