> ## Documentation Index > Fetch the complete documentation index at: https://docs.parlayx.com/llms.txt > Use this file to discover all available pages before exploring further. # Submit Order > Places a limit order on a Kalshi market and returns the issued order id. ## OpenAPI ````yaml /openapi/v1.json post /v1/kalshi/orders openapi: 3.0.0 info: title: ParlayX API version: 1.0.0 description: Aggregated prediction-market trading API servers: - url: https://api.parlayx.com security: [] tags: - name: Authentication description: Confirm your signing and read the server clock. - name: Discovery description: Browse sports, competitions, events, and markets. - name: Polymarket description: Submit and manage orders on Polymarket outcomes. - name: Kalshi description: Submit and manage orders on Kalshi markets. paths: /v1/kalshi/orders: post: tags: - Kalshi summary: Submit Order description: Places a limit order on a Kalshi market and returns the issued order id. operationId: submitKalshiOrder parameters: - name: PX-Key-Id in: header required: true schema: type: string description: The key id issued for your signing keypair. - name: PX-Timestamp in: header required: true schema: type: string description: >- Unix seconds at signing, valid within 30 seconds of the server clock. - name: PX-Signature in: header required: true schema: type: string description: Ed25519 signature of the request - name: PX-Content-Sha256 in: header required: true schema: type: string description: >- Hex SHA-256 of the request body, or the SHA-256 of the empty string when there is no body. - schema: type: string minLength: 1 description: >- Idempotency key for this request. Re-sending the same key with the same body returns the original result and creates no duplicate; re-sending it with a different body is rejected with 422. example: 2f1a8c4e-0b3d-4a9c-8e7f-1a2b3c4d5e6f required: true name: Idempotency-Key in: header requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/KalshiOrderRequest' responses: '201': description: Order accepted content: application/json: schema: $ref: '#/components/schemas/SubmitKalshiOrderResponse' '400': description: >- Invalid request, a missing/malformed Idempotency-Key header, or the venue refused the order for a reason the caller can act on (for example an insufficient balance) content: application/json: schema: $ref: '#/components/schemas/BadRequestError' '404': description: The Kalshi market named by `ticker` does not exist content: application/json: schema: $ref: '#/components/schemas/ApiError' '422': description: Idempotency key reused with a different request body content: application/json: schema: $ref: '#/components/schemas/IdempotencyConflictError' '500': description: Internal error content: application/json: schema: $ref: '#/components/schemas/ApiError' components: schemas: KalshiOrderRequest: type: object properties: ticker: type: string minLength: 1 pattern: ^[A-Z0-9]+([.-][A-Z0-9]+)*$ description: >- Kalshi market ticker that identifies the market to trade. Uppercase alphanumeric segments joined by `-`, with `.` permitted inside a segment for a decimal strike (e.g. `KXBTCD-26AUG0607-T64599.99`). Case-sensitive: a lowercase ticker is rejected rather than upcased, because changing it would name a different instrument than the caller asked for. example: KXPRES-2028 side: $ref: '#/components/schemas/KalshiSide' action: $ref: '#/components/schemas/KalshiAction' count: type: integer minimum: 0 exclusiveMinimum: true description: Order size in whole contracts. example: 10 priceCents: type: integer minimum: 1 maximum: 99 description: >- Limit price in whole cents from 1 to 99, in the traded side's own frame. example: 38 timeInForce: oneOf: - $ref: '#/components/schemas/GtcTimeInForce' - $ref: '#/components/schemas/IocTimeInForce' - $ref: '#/components/schemas/FokTimeInForce' discriminator: propertyName: type mapping: GTC: $ref: '#/components/schemas/GtcTimeInForce' IOC: $ref: '#/components/schemas/IocTimeInForce' FOK: $ref: '#/components/schemas/FokTimeInForce' default: type: GTC description: Execution policy; defaults to GTC. required: - ticker - side - action - count - priceCents additionalProperties: false title: Order Request SubmitKalshiOrderResponse: type: object properties: orderId: type: string format: uuid description: Issued order id. example: 3f8b2c9a-2d18-4f7e-9c2a-1b6e1f0c8a4d status: $ref: '#/components/schemas/TradingOrderStatus' required: - orderId - status BadRequestError: anyOf: - $ref: '#/components/schemas/ApiError' - $ref: '#/components/schemas/IdempotencyBadRequestError' ApiError: type: object properties: error: type: object properties: code: $ref: '#/components/schemas/ApiErrorCode' message: type: string description: Plain-text explanation of the error. orderId: type: string format: uuid description: >- The affected order, present only on ORDER_RECONCILIATION_REQUIRED; read it back to determine whether it reached the venue. required: - code - message required: - error IdempotencyConflictError: type: object properties: error: type: object properties: code: type: string enum: - IDEMPOTENCY_CONFLICT example: IDEMPOTENCY_CONFLICT message: type: string example: Idempotency key was reused with a different request body required: - code - message required: - error KalshiSide: type: string enum: - 'YES' - 'NO' description: Which side of the Kalshi market the contract represents. example: 'YES' KalshiAction: type: string enum: - BUY - SELL description: Order direction against the chosen side. example: BUY GtcTimeInForce: type: object properties: type: type: string enum: - GTC required: - type additionalProperties: false description: 'Good til cancelled: rest at limitPrice until filled or cancelled.' title: GoodTillCancelled IocTimeInForce: type: object properties: type: type: string enum: - IOC required: - type additionalProperties: false description: >- Immediate or cancel: fill whatever is immediately available, then cancel the remainder. title: ImmediateOrCancel FokTimeInForce: type: object properties: type: type: string enum: - FOK required: - type additionalProperties: false description: >- Fill or kill: fill in full immediately against resting liquidity, otherwise cancel. title: FillOrKill TradingOrderStatus: type: string enum: - PENDING - SUBMITTED - OPEN - FILLED - CANCELLED - REJECTED description: |- Order lifecycle status. | Status | Meaning | | --- | --- | | `PENDING` | Accepted, not yet sent to the venue. | | `SUBMITTED` | Sent, awaiting venue acknowledgement. | | `OPEN` | Resting on the venue. | | `FILLED` | Fully filled. | | `CANCELLED` / `REJECTED` | Terminal. | example: OPEN IdempotencyBadRequestError: type: object properties: error: type: object properties: code: $ref: '#/components/schemas/IdempotencyBadRequestErrorCode' message: type: string required: - code - message required: - error ApiErrorCode: type: string enum: - INVALID_REQUEST - NOT_FOUND - INSUFFICIENT_BALANCE - IDEMPOTENCY_CONFLICT - ORDER_NOT_CANCELLABLE - ORDER_RECONCILIATION_REQUIRED - INTERNAL_ERROR description: Stable identifier for the error category. IdempotencyBadRequestErrorCode: type: string enum: - IDEMPOTENCY_KEY_REQUIRED - IDEMPOTENCY_KEY_INVALID description: Stable identifier for the Idempotency-Key header validation failure. example: IDEMPOTENCY_KEY_REQUIRED ````