> ## Documentation Index > Fetch the complete documentation index at: https://docs.hyperprop.com/llms.txt > Use this file to discover all available pages before exploring further. # Ask the indicator assistant (streaming) > Same request as `POST /v1/indicator-builder/chat`, but the answer is streamed as newline-delimited JSON (`application/x-ndjson`) so the client can show the reply as it is written. Events: `{"type":"thinking"}` heartbeats while the model reasons, `{"type":"delta","text":"…"}` for each piece of answer text (prose and the code block, in order), and exactly one terminal event — `{"type":"done","data":{message,source,pane,name}}` with the same shape as the non-streaming response, or `{"type":"error","code","message"}`. The HTTP status is 200 once streaming has begun; rate-limit and configuration errors are returned as normal JSON errors before any bytes are sent. Prefer this endpoint: long scripts can take over a minute to generate. ## OpenAPI ````yaml /api-reference/openapi.json post /v1/indicator-builder/chat/stream openapi: 3.0.0 info: title: Hyperprop Platform API version: 1.0.0 description: >- REST API for the Hyperprop Trading Platform — provision evaluation and funded trading accounts, manage traders and plans, react to account lifecycle events via signed webhooks, and reconcile billing. Built for prop firms integrating from their own backend. Authentication, quick start, error handling, idempotency, pagination, custom metadata, webhooks, and the MCP connector are documented at https://docs.hyperprop.com. x-logo: url: https://app.hyperprop.com/logo-icon.svg altText: Hyperprop href: https://hyperprop.com servers: - url: https://api.hyperprop.com/platform description: Production security: [] tags: - name: Authentication description: >- User authentication - signup, signin, signout, password reset, email verification, OAuth, and MFA - name: User description: >- User account management - profile, notifications, agreements, dismissals, and audit logs. Requires Bearer token. - name: Organization description: >- Organization management - profile, team, trading accounts, plans, and rules. Supports **dual authentication**: Bearer JWT token (dashboard users) OR X-API-Key (programmatic access). - name: Market Data description: CME futures contracts and market data. Requires Bearer token. - name: Indicator Builder description: >- AI-assisted authoring of custom Hyperprop Script indicators for the web terminal. Requires Bearer token. - name: System description: System endpoints - health checks and connectivity paths: /v1/indicator-builder/chat/stream: post: tags: - Indicator Builder summary: Ask the indicator assistant (streaming) description: >- Same request as `POST /v1/indicator-builder/chat`, but the answer is streamed as newline-delimited JSON (`application/x-ndjson`) so the client can show the reply as it is written. Events: `{"type":"thinking"}` heartbeats while the model reasons, `{"type":"delta","text":"…"}` for each piece of answer text (prose and the code block, in order), and exactly one terminal event — `{"type":"done","data":{message,source,pane,name}}` with the same shape as the non-streaming response, or `{"type":"error","code","message"}`. The HTTP status is 200 once streaming has begun; rate-limit and configuration errors are returned as normal JSON errors before any bytes are sent. Prefer this endpoint: long scripts can take over a minute to generate. operationId: postV1IndicatorbuilderChatStream requestBody: $ref: '#/components/requestBodies/Model470' responses: '200': description: NDJSON event stream (see notes) content: '*/*': schema: type: string '400': description: Validation failed content: '*/*': schema: $ref: '#/components/schemas/Model473' '401': description: Authentication required content: '*/*': schema: $ref: '#/components/schemas/Model9' '429': description: >- You have reached the indicator builder limit for this hour. Try again later. content: '*/*': schema: $ref: '#/components/schemas/Model595' '503': description: The indicator assistant is not configured on this server. content: '*/*': schema: $ref: '#/components/schemas/Model596' components: requestBodies: Model470: content: application/json: schema: $ref: '#/components/schemas/Model470' schemas: Model473: type: object properties: success: type: boolean description: Always false on errors example: false statusCode: type: number example: 400 error: type: string example: Bad Request message: type: string example: Validation failed code: type: string description: Machine-readable error code — switch on this, not on message text example: VALIDATION_ERROR Model9: type: object properties: success: type: boolean description: Always false on errors example: false statusCode: type: number example: 401 error: type: string example: Unauthorized message: type: string example: Authentication required code: type: string description: Machine-readable error code — switch on this, not on message text example: UNAUTHORIZED Model595: type: object properties: success: type: boolean description: Always false on errors example: false statusCode: type: number example: 429 error: type: string example: Too Many Requests message: type: string example: >- You have reached the indicator builder limit for this hour. Try again later. code: type: string description: Machine-readable error code — switch on this, not on message text example: RATE_LIMITED Model596: type: object properties: success: type: boolean description: Always false on errors example: false statusCode: type: number example: 503 error: type: string example: Error message: type: string example: The indicator assistant is not configured on this server. code: type: string description: Machine-readable error code — switch on this, not on message text example: MODEL_UNAVAILABLE Model470: type: object properties: messages: $ref: '#/components/schemas/messages' script: $ref: '#/components/schemas/script' error: type: string description: >- Compile or runtime error the chart reported for the current script, if any. example: null maxLength: 2000 dataset: $ref: '#/components/schemas/dataset' required: - messages - script messages: type: array description: >- Chat history, oldest first. The last message must be from the user. Each message is capped at 24,000 characters — enough for a full Pine Script paste. example: - role: user content: Build an RSI with 30/70 guides. minItems: 1 maxItems: 40 items: $ref: '#/components/schemas/Model469' script: type: object description: >- What is currently in the editor. The reply replaces it wholesale when it contains code. properties: name: type: string example: RSI default: '' maxLength: 80 pane: $ref: '#/components/schemas/pane' source: type: string example: |- const length = input.int('Length', 14, { min: 2, max: 100 }); function compute(bars, inputs, hp) { const rsi = hp.rsi(bars.map(b => b.c), length); return { plots: [{ title: 'RSI', values: rsi, color: '#ab47bc' }], range: { min: 0, max: 100 }, guides: [30, 70] }; } maxLength: 40000 required: - pane - source dataset: type: object description: >- The sample series the builder chart is showing, so the model can reason about scale and bar count. properties: symbol: type: string example: ES maxLength: 16 interval: type: string example: 5m maxLength: 8 barCount: type: integer example: 3000 minimum: 0 maximum: 100000 required: - symbol - interval - barCount Model469: type: object properties: role: $ref: '#/components/schemas/Model468' content: type: string minLength: 1 maxLength: 24000 required: - role - content pane: type: string example: separate enum: - overlay - separate Model468: type: string enum: - user - assistant ```` ## Related topics - [Ask the indicator assistant](/platform-api/indicator-builder/ask-the-indicator-assistant.md) - [Indicator assistant availability](/platform-api/indicator-builder/indicator-assistant-availability.md) - [Hyperprop Script: build indicators (agent recipe)](/guides/hyperprop-script.md) - [Changelog](/changelog.md) - [Get all order books (best bid/ask)](/market-data-api/order-book/get-all-order-books-best-bidask.md)