> ## Documentation Index > Fetch the complete documentation index at: https://docs.novig.com/llms.txt > Use this file to discover all available pages before exploring further. # Get order book > Get the current order book for a specific market. For both outcomes of the market, orders are returned sorted by price-time priority. Orders on the book are partially obfuscated up to price, quantity, and direction. **Rate limit:** 100 requests per second. ## OpenAPI ````yaml /api-reference/spec-files/openapi31.json get /nbx/v2/emm/book/{marketId} openapi: 3.1.0 info: title: NBX API description: >+ ## API Overview The NBX API is designed with a tri-interface architecture: - **REST API** - **URL:** `https://api.novig.us/nbx/v2` - **Constraints:** - **Rate limits:** - Order placement (single and batch): 20 requests per second - Order cancellation: 1,000 requests per second - Kill switch: 1 request per 30 seconds - Data retrieval: 100 requests per second - User history (`/fills`, `/orders`, `/transactions`): 16 requests/second burst, 256 requests/minute sustained - **Timeout:** 5 seconds - **Features:** - Place, cancel, and query orders. - Retrieve market data and positions. - Manage account settings and balances. - **Best Practices:** - Use appropriate HTTP methods. - Include `Authorization` and `Content-Type` headers. - Implement exponential backoff for handling rate limits and robust error handling. - **WebSocket API** - **URL:** `wss://api.novig.us/tape` - **Constraints:** - **Rate limit:** 10 messages per minute - **Timeout:** 300 seconds without heartbeat - **Features:** - Real-time order book ticks. - Real-time market lifecycle updates. - Private fill and cancel notifications. - Heartbeat mechanism to ensure connection health. - **Best Practices:** - Implement reconnection logic with exponential backoff. - Process messages sequentially to maintain order book integrity. - Appropriately handle various event types. - Subscribe to specific market events or to the global tape. - **GraphQL API** - **URL:** `https://gql.novig.us/v1/graphql` - **Constraints:** - **Rate limit:** 650 requests per minute - **Timeout:** 2 seconds - **Features:** - Interactive Explorer available via [**Hoppscotch GraphQL Sandbox**](https://hoppscotch.io/graphql) - Flexible querying of market data and prices with tailored filters. - Access historical data and statistics. - Role-based access control with baseline lurker permissions. - **Best Practices:** - Use GraphQL for historical analysis and non-time-critical queries. - Opt for the WebSocket API for real-time data needs. ## Authentication The NBX API uses [**OAuth 2.0 Client Credentials**](https://auth0.com/docs/get-started/authentication-and-authorization-flow/client-credentials-flow) with JSON Web Tokens (JWT). 1. **Obtain Credentials:** Request your client ID and secret from Novig. 2. **Request an Access Token:** Send a POST request to the OAuth endpoint. For example: ```bash curl --request POST --url https://auth.novig.us/oauth/token --header "Content-Type: application/json" --data '{ "audience" : "https://api.novig.us", "grant_type" : "client_credentials", "client_id" : "YOUR_CLIENT_ID", "client_secret" : "YOUR_CLIENT_SECRET" }' ``` 3. **Use the Token:** Include the token in your requests by setting the HTTP header: ```bash Authorization: Bearer YOUR_ACCESS_TOKEN ``` > **Note:** For integration in the QA environment, you'll need to use different endpoints: > - **Issuer:** `https://auth-qa.novig.us` > - **Audience:** `https://api-qa.novig.us` > - **API Base URL:** `https://api-qa.novig.us` version: 0.0.44 contact: name: Contact url: https://novig.us email: tech@novig.us servers: - url: https://api.novig.us description: Production - url: https://api-qa.novig.us description: QA security: [] tags: - name: Orders description: Endpoints for managing orders and trades - name: Markets description: Endpoints for accessing market data and order books - name: Events description: Endpoints for discovering events and fetching event-related data - name: Account description: Endpoints for managing account settings and balances - name: Positions description: Endpoints for accessing positions and fills - name: WebSockets description: Channels for real-time market data and order updates - name: GraphQL description: GraphQL API for querying market data and prices paths: /nbx/v2/emm/book/{marketId}: get: tags: - Markets summary: Get order book description: >- Get the current order book for a specific market. For both outcomes of the market, orders are returned sorted by price-time priority. Orders on the book are partially obfuscated up to price, quantity, and direction. **Rate limit:** 100 requests per second. operationId: getMarketOrderBook parameters: - name: marketId required: true in: path description: The ID of the market schema: type: string - name: currency in: query description: The currency denomination required: true schema: type: string enum: - CASH - COIN responses: '200': description: Successfully retrieved the order book. content: application/json: schema: $ref: '#/components/schemas/BookResponseDto' '400': description: Bad request components: schemas: BookResponseDto: type: object properties: marketId: type: string description: The ID of the market marketDescription: type: string description: Description of the market outcomeLadders: description: List of outcomes with their order books type: array items: $ref: '#/components/schemas/BookLadderDto' required: - marketId - marketDescription - outcomeLadders BookLadderDto: type: object properties: outcomeId: type: string description: The ID of the outcome bids: description: List of bid orders in price-time priority order type: array items: $ref: '#/components/schemas/ObfuscatedOrderDto' required: - outcomeId - bids ObfuscatedOrderDto: type: object properties: id: type: string description: The ID of the order example: 123e4567-e89b-12d3-a456-426614174000 price: type: number description: >- The price of the order (in decimal probability, up to 3 decimal places) example: 0.667 qty: type: number description: >- The remaining quantity of the order, denominated in Minimum Currency Units example: 110 originalQty: type: number description: >- The original quantity of the order, denominated in Minimum Currency Units example: 110 currency: type: string enum: - CASH - COIN description: The currency in which the order is denominated example: CASH outcomeId: type: string description: The ID of the outcome for which the order is placed marketId: type: string description: The ID of the market for which the order is placed status: type: string description: The status of the order immediately after execution example: RESTING created_at: type: string format: date-time description: The timestamp when the order was created example: '2024-01-01T00:00:00.000Z' required: - id - price - qty - originalQty - currency - outcomeId - marketId - status - created_at ````