> ## Documentation Index > Fetch the complete documentation index at: https://radarkit.ai/docs/llms.txt > Use this file to discover all available pages before exploring further. # Add topic > Creates a topic. Names are unique within a project and the check ignores letter case. If a topic with that name exists you get `409 TOPIC_EXISTS` with the existing id in `details.topic_id`. Use that id. Nothing was created twice. Cost: 1 API credit. Needs: Write. Your seat must be allowed to manage topics. ## OpenAPI ````yaml /openapi.yaml post /projects/{project}/topics openapi: 3.1.0 info: title: Radarkit API version: 1.0.0 summary: Your AI visibility data, outside the dashboard. description: > Radarkit tracks how AI assistants answer the questions your customers ask, and what each answer says about your brand. This API gives you that data as JSON. Every request needs an API key in the `Authorization` header. Every response has the same shape: `data`, `meta`, `credits` and `request_id`. Most calls cost 1 API credit. Heavier calls cost 2. Exports spend Export rows instead, one per row. contact: name: Radarkit support email: mail@radarkit.ai url: https://radarkit.ai servers: - url: https://api.radarkit.ai/v1 description: Production security: - bearerAuth: [] tags: - name: Account description: Your key, your plan and both balances. Free. - name: Projects description: One project is one brand or website. Every other call needs a project id. - name: Topics description: Topics group prompts. Every prompt belongs to one topic. - name: Prompts description: The questions Radarkit asks every AI model on a schedule. - name: Visibility description: The daily visibility score per model, precomputed. - name: Responses description: One row per AI answer, with everything Radarkit found in it. - name: Sources description: The web pages AI answers cite or consult. - name: Competitors description: Who the answers recommend and how often. - name: Rankings description: Recommended domains with their position in the answer. - name: Query fanout description: The web searches a model ran before answering, one row per answer. - name: Web search description: How often the models searched and what they searched for, summarised. - name: Sentiment description: How the answers talk about your brand. - name: Exports description: > Thousands of rows as one gzip file. Four calls in order: estimate, create, poll, download. Estimate is free and returns the exact row count. Create charges that many Export rows and queues the job. Poll the export until its status is `ready`. Download follows a redirect to a signed link that works for 30 minutes. Files are kept for 7 days. - name: Content description: Have the Content agent write an article for a prompt, then poll the run. paths: /projects/{project}/topics: post: tags: - Topics summary: Add topic description: > Creates a topic. Names are unique within a project and the check ignores letter case. If a topic with that name exists you get `409 TOPIC_EXISTS` with the existing id in `details.topic_id`. Use that id. Nothing was created twice. Cost: 1 API credit. Needs: Write. Your seat must be allowed to manage topics. operationId: addTopic parameters: - $ref: '#/components/parameters/project' requestBody: required: true content: application/json: schema: type: object required: - name properties: name: type: string maxLength: 255 description: The topic name. example: name: Pricing responses: '201': description: The new topic. content: application/json: schema: type: object properties: data: $ref: '#/components/schemas/Topic' meta: type: object properties: project: type: string credits: $ref: '#/components/schemas/Credits' request_id: $ref: '#/components/schemas/RequestId' example: data: id: 17 name: Pricing status: active created_at: '2026-09-03T10:20:11+00:00' meta: project: 64f1a2b3c4d5e6f708192a3b credits: charged: 1 remaining: 2944 request_id: req_01j9x4y7m8n9o0p1q2r3s4t5u6 '401': $ref: '#/components/responses/Unauthenticated' '402': $ref: '#/components/responses/PaymentRequired' '403': description: >- `SCOPE_MISSING`: the key has no Write permission. `PROJECT_FORBIDDEN`: the key cannot reach this project. `PERMISSION_DENIED`: your seat cannot manage topics. content: application/json: schema: $ref: '#/components/schemas/Error' '404': $ref: '#/components/responses/ProjectNotFound' '409': description: >- `TOPIC_EXISTS`: a topic with that name exists. `details.topic_id` holds its id. content: application/json: schema: $ref: '#/components/schemas/Error' example: error: code: TOPIC_EXISTS message: A topic named "Pricing" already exists. details: topic_id: 17 name: Pricing request_id: req_01j9x4y7m8n9o0p1q2r3s4t5u7 '422': $ref: '#/components/responses/ValidationFailed' '429': $ref: '#/components/responses/RateLimited' components: parameters: project: name: project in: path required: true description: The project id. 24 characters. From List projects. schema: type: string pattern: ^[0-9a-f]{24}$ example: 64f1a2b3c4d5e6f708192a3b schemas: Topic: type: object properties: id: type: integer name: type: string status: type: string prompts_count: type: integer description: Active prompts in the topic. Only on List topics. created_at: type: - string - 'null' format: date-time Credits: type: object description: >- What this call cost and what is left. Also in the `X-RadarKit-Credits-Charged` and `X-RadarKit-Credits-Remaining` headers. properties: charged: type: integer description: API credits spent on this call. remaining: type: - integer - 'null' description: API credits left on the billed account. Null on free calls. RequestId: type: string description: >- A unique id for this call. Also in the `X-Request-Id` header. Quote it when you contact support. example: req_01j9x4m2p7q8r9s0t1u2v3w4x5 Error: type: object description: Every failed call has this shape and no `data`. properties: error: type: object properties: code: type: string description: Stable. Build on this, not on the message. message: type: string description: For people. May change. details: description: >- More when there is more to say. Which field failed, how long to wait, which id already exists. oneOf: - type: object - type: array items: type: object request_id: $ref: '#/components/schemas/RequestId' responses: Unauthenticated: description: >- `UNAUTHENTICATED`: no key, a wrong key, or a revoked or expired key. `KEY_IN_QUERY` (400) if the key was in the URL. content: application/json: schema: $ref: '#/components/schemas/Error' example: error: code: UNAUTHENTICATED message: >- Missing or invalid API key. Send it as: Authorization: Bearer rk_live_YOUR_KEY request_id: req_01j9x4q7z8y9x0w1v2u3t4s5r6 PaymentRequired: description: >- `INSUFFICIENT_CREDITS`: no API credits left, nothing ran. `PLAN_INACTIVE`: the key owner's plan is not active. `OWNER_PLAN_INACTIVE`: the project owner's plan is not active. content: application/json: schema: $ref: '#/components/schemas/Error' example: error: code: INSUFFICIENT_CREDITS message: Not enough API credits. request_id: req_01j9x4q7z8y9x0w1v2u3t4s5r7 ProjectNotFound: description: '`PROJECT_NOT_FOUND`: no project with that id.' content: application/json: schema: $ref: '#/components/schemas/Error' example: error: code: PROJECT_NOT_FOUND message: No project with that id. request_id: req_01j9x4q7z8y9x0w1v2u3t4s5s0 ValidationFailed: description: >- `VALIDATION_FAILED`: a parameter is missing or wrong. `details` lists each field. content: application/json: schema: $ref: '#/components/schemas/Error' example: error: code: VALIDATION_FAILED message: One or more parameters are invalid. details: - path: from message: The from field must match the format Y-m-d. request_id: req_01j9x4s6b7c8d9e0f1g2h3i4j5 RateLimited: description: >- `RATE_LIMITED`: too many calls. Wait the seconds in `Retry-After` and send the same request again. Nothing was charged. headers: Retry-After: description: Seconds to wait. schema: type: integer content: application/json: schema: $ref: '#/components/schemas/Error' example: error: code: RATE_LIMITED message: Too many requests. Slow down and retry. details: retry_after: 21 request_id: req_01j9x4r2s3t4u5v6w7x8y9z0a1 securitySchemes: bearerAuth: type: http scheme: bearer description: >- Your API key. Create one in Settings, API keys. Send it as `Authorization: Bearer rk_live_YOUR_KEY`. ````