> ## Documentation Index > Fetch the complete documentation index at: https://docs.d1.exchange/llms.txt > Use this file to discover all available pages before exploring further. # Get order book > Aggregated price levels, best first on both sides, with your share of each level. Guide: [Order book](/market-makers/market-data#order-book). ## OpenAPI ````yaml /api-reference/openapi.json get /mm/v1/markets/{instrumentId}/orderbook openapi: 3.1.0 info: title: D1 Market Maker API version: mm/v1 description: >- API for authorized market makers: market data, account state, order placement and cancellation, fills and sequenced executions. Read endpoints require the mm:read scope; trading endpoints require mm:trade. servers: - url: '{D1_API_URL}' description: Base URL provided by D1 during onboarding. variables: D1_API_URL: default: $D1_API_URL description: Provided by D1 during onboarding. security: - bearerAuth: - mm:read tags: - name: Status - name: Market data - name: Account - name: Orders - name: Trading - name: Executions paths: /mm/v1/markets/{instrumentId}/orderbook: get: tags: - Market data summary: Get order book description: >- Aggregated price levels, best first on both sides, with your share of each level. Guide: [Order book](/market-makers/market-data#order-book). operationId: getOrderBook parameters: - name: instrumentId in: path required: true schema: type: string description: Market identifier from /mm/v1/markets. - name: depth in: query required: false schema: type: integer minimum: 1 maximum: 50 default: 20 description: Price levels per side, 1–50. responses: '200': description: OK content: application/json: schema: type: object properties: instrumentId: type: string status: $ref: '#/components/schemas/MarketStatus' tradingPaused: type: boolean depth: type: integer bids: type: array items: $ref: '#/components/schemas/BookLevel' description: Highest price first. asks: type: array items: $ref: '#/components/schemas/BookLevel' description: Lowest price first. truncated: type: boolean description: More book exists than shown. serverTimeMs: type: string description: >- D1 server time at the read, Unix milliseconds, as a decimal string. example: '1800000000000' required: - instrumentId - status - tradingPaused - depth - bids - asks - truncated - serverTimeMs example: instrumentId: status: ACTIVE tradingPaused: false depth: 20 bids: - price: units: '105' decimals: 0 quantity: units: '12' decimals: 0 ownQuantity: units: '0' decimals: 0 partial: false asks: - price: units: '110' decimals: 0 quantity: units: '8' decimals: 0 ownQuantity: units: '3' decimals: 0 partial: false truncated: false serverTimeMs: '1800000000456' '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '403': $ref: '#/components/responses/Forbidden' '404': $ref: '#/components/responses/NotFound' '429': $ref: '#/components/responses/RateLimited' '500': $ref: '#/components/responses/Internal' components: schemas: MarketStatus: type: string description: Market lifecycle status. enum: - ACTIVE - TRADING_CLOSED - EXPIRING - SETTLED BookLevel: type: object properties: price: $ref: '#/components/schemas/Exact' quantity: $ref: '#/components/schemas/Exact' description: >- Total resting quantity at this price. A lower bound when partial is true. ownQuantity: $ref: '#/components/schemas/Exact' description: >- Your share of quantity. Zero if none. A lower bound when partial is true. partial: type: boolean description: >- True on the one level where D1's read bound was reached; its quantities are lower bounds. required: - price - quantity - ownQuantity - partial Exact: type: object properties: units: type: string description: >- Integer value as a decimal string. May be negative. May exceed 2^53 − 1: parse with BigInt or a decimal library, never Number. example: '105000123456' decimals: type: integer minimum: 0 description: Scale. value = units × 10^-decimals. example: 6 required: - units - decimals description: Exact fixed-point number. value = units × 10^-decimals. Error: type: object properties: error: type: string description: Stable error code. enum: - AUTH_REQUIRED - INVALID_API_KEY - API_KEY_REVOKED - DEALER_SUSPENDED - INSUFFICIENT_SCOPE - MALFORMED_REQUEST - INVALID_CURSOR - NOT_FOUND - RATE_LIMITED - INTERNAL - TRADING_DISABLED - UNKNOWN_INSTRUMENT - MARKET_NOT_TRADING - MARKET_PAUSED - INVALID_PRICE - INVALID_QUANTITY - IDEMPOTENCY_CONFLICT - INSUFFICIENT_FUNDS - INSUFFICIENT_POSITION - RISK_LIMIT - ORDER_NOT_FOUND - ORDER_NOT_CANCELLABLE message: type: string description: Human-readable message. Do not parse. limit: type: string enum: - MAX_OPEN_EXPOSURE - MAX_RESTING_ORDERS - MAX_RESTING_ORDERS_PER_INSTRUMENT description: >- Present only when error is RISK_LIMIT: the limit the order would exceed. required: - error - message responses: BadRequest: description: MALFORMED_REQUEST or INVALID_CURSOR. content: application/json: schema: $ref: '#/components/schemas/Error' example: error: MALFORMED_REQUEST message: … Unauthorized: description: AUTH_REQUIRED, INVALID_API_KEY or API_KEY_REVOKED. content: application/json: schema: $ref: '#/components/schemas/Error' example: error: INVALID_API_KEY message: … Forbidden: description: DEALER_SUSPENDED or INSUFFICIENT_SCOPE. content: application/json: schema: $ref: '#/components/schemas/Error' example: error: INSUFFICIENT_SCOPE message: … NotFound: description: NOT_FOUND. content: application/json: schema: $ref: '#/components/schemas/Error' example: error: NOT_FOUND message: … RateLimited: description: >- RATE_LIMITED: not admitted. Wait Retry-After seconds, then retry the same request. headers: Retry-After: description: Seconds until the rate-limit window ends (at least 1). schema: type: integer minimum: 1 content: application/json: schema: $ref: '#/components/schemas/Error' example: error: RATE_LIMITED message: Too many requests. Retry after the indicated delay. Internal: description: INTERNAL. Retry with backoff. content: application/json: schema: $ref: '#/components/schemas/Error' example: error: INTERNAL message: … securitySchemes: bearerAuth: type: http scheme: bearer description: >- Authorization: Bearer . Scopes: mm:read (GET endpoints), mm:trade (POST endpoints). ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.