> ## Documentation Index > Fetch the complete documentation index at: https://docs.kalshi.com/llms.txt > Use this file to discover all available pages before exploring further. # Get Multiple Market Orderbooks > Endpoint for getting the current order books for multiple markets in a single request. The order book shows all active bid orders for both yes and no sides of a binary market. It returns yes bids and no bids only (no asks are returned). This is because in binary markets, a bid for yes at price X is equivalent to an ask for no at price (100-X). For example, a yes bid at 7¢ is the same as a no ask at 93¢, with identical contract sizes. Each side shows price levels with their corresponding quantities and order counts, organized from best to worst prices. Returns one orderbook per requested market ticker. ## OpenAPI ````yaml /openapi.yaml get /markets/orderbooks openapi: 3.0.0 info: title: Kalshi Trade API Manual Endpoints version: 3.22.0 description: >- Manually defined OpenAPI spec for endpoints being migrated to spec-first approach servers: - url: https://external-api.kalshi.com/trade-api/v2 description: Production Trade API server - url: https://api.elections.kalshi.com/trade-api/v2 description: Production shared API server, also supported - url: https://external-api.demo.kalshi.co/trade-api/v2 description: Demo Trade API server - url: https://demo-api.kalshi.co/trade-api/v2 description: Demo shared API server, also supported security: [] tags: - name: api-keys description: API key management endpoints - name: orders description: Order management endpoints - name: order-groups description: Order group management endpoints - name: portfolio description: Portfolio and balance information endpoints - name: communications description: Request-for-quote (RFQ) endpoints - name: multivariate description: Multivariate event collection endpoints - name: exchange description: Exchange status and information endpoints - name: live-data description: Live data endpoints - name: markets description: Market data endpoints - name: milestone description: Milestone endpoints - name: search description: Search and filtering endpoints - name: incentive-programs description: Incentive program endpoints - name: fcm description: FCM member specific endpoints - name: events description: Event endpoints - name: structured-targets description: Structured targets endpoints paths: /markets/orderbooks: get: tags: - market summary: Get Multiple Market Orderbooks description: >- Endpoint for getting the current order books for multiple markets in a single request. The order book shows all active bid orders for both yes and no sides of a binary market. It returns yes bids and no bids only (no asks are returned). This is because in binary markets, a bid for yes at price X is equivalent to an ask for no at price (100-X). For example, a yes bid at 7¢ is the same as a no ask at 93¢, with identical contract sizes. Each side shows price levels with their corresponding quantities and order counts, organized from best to worst prices. Returns one orderbook per requested market ticker. operationId: GetMarketOrderbooks parameters: - name: tickers in: query required: true description: List of market tickers to fetch orderbooks for schema: type: array items: type: string maxLength: 200 minItems: 1 maxItems: 100 style: form explode: true x-oapi-codegen-extra-tags: validate: required,min=1,max=100,dive,max=200 responses: '200': description: Orderbooks retrieved successfully content: application/json: schema: $ref: '#/components/schemas/GetMarketOrderbooksResponse' '400': $ref: '#/components/responses/BadRequestError' '401': $ref: '#/components/responses/UnauthorizedError' '500': $ref: '#/components/responses/InternalServerError' security: - kalshiAccessKey: [] kalshiAccessSignature: [] kalshiAccessTimestamp: [] components: schemas: GetMarketOrderbooksResponse: type: object required: - orderbooks properties: orderbooks: type: array items: $ref: '#/components/schemas/MarketOrderbookFp' MarketOrderbookFp: type: object required: - ticker - orderbook_fp properties: ticker: type: string orderbook_fp: $ref: '#/components/schemas/OrderbookCountFp' ErrorResponse: type: object properties: code: type: string description: Error code message: type: string description: Human-readable error message details: type: string description: Additional details about the error, if available service: type: string description: The name of the service that generated the error OrderbookCountFp: type: object required: - yes_dollars - no_dollars properties: yes_dollars: type: array items: $ref: '#/components/schemas/PriceLevelDollarsCountFp' no_dollars: type: array items: $ref: '#/components/schemas/PriceLevelDollarsCountFp' description: >- Orderbook with fixed-point contract counts (fp) in all dollar price levels. PriceLevelDollarsCountFp: type: array minItems: 2 maxItems: 2 example: - '0.1500' - '100.00' items: type: string description: >- Price level in dollars represented as [dollars_string, fp] where dollars_string is like "0.1500" and fp is a FixedPointCount string (fixed-point contract count). The second element is the contract quantity (not price). responses: BadRequestError: description: Bad request - invalid input content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' UnauthorizedError: description: Unauthorized - authentication required content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' InternalServerError: description: Internal server error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' securitySchemes: kalshiAccessKey: type: apiKey in: header name: KALSHI-ACCESS-KEY description: Your API key ID kalshiAccessSignature: type: apiKey in: header name: KALSHI-ACCESS-SIGNATURE description: RSA-PSS signature of the request kalshiAccessTimestamp: type: apiKey in: header name: KALSHI-ACCESS-TIMESTAMP description: Request timestamp in milliseconds ````