> ## 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. # Amend Order > Reprices or resizes a resting Kalshi order in place. ## OpenAPI ````yaml /openapi/v1.json post /v1/kalshi/orders/{orderId}/amend 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. - name: ProphetX description: Submit and manage orders on ProphetX strikes. - name: Limitless description: Discover and trade Limitless markets. paths: /v1/kalshi/orders/{orderId}/amend: post: tags: - Kalshi summary: Amend Order description: Reprices or resizes a resting Kalshi order in place. operationId: amendKalshiOrder 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 format: uuid description: Issued order id. example: 3f8b2c9a-2d18-4f7e-9c2a-1b6e1f0c8a4d required: true name: orderId in: path requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/AmendKalshiOrderRequest' responses: '200': description: >- Order amended, or already resting on the terms asked for and returned unchanged content: application/json: schema: $ref: '#/components/schemas/AmendKalshiOrderResponse' '400': description: Invalid request content: application/json: schema: $ref: '#/components/schemas/ApiError' '401': description: The request was not authenticated content: application/json: schema: $ref: '#/components/schemas/AuthError' '403': description: The key is not permitted to perform this action content: application/json: schema: $ref: '#/components/schemas/AuthError' '404': description: Order not found content: application/json: schema: $ref: '#/components/schemas/ApiError' '409': description: The order cannot be amended from its current state content: application/json: schema: $ref: '#/components/schemas/ApiError' '429': description: >- The organization has exceeded its request rate; retry after the Retry-After interval content: application/json: schema: $ref: '#/components/schemas/AuthError' '500': description: Internal error content: application/json: schema: $ref: '#/components/schemas/ApiError' '503': description: >- The venue's outcome for the amend is unknown; read the order before retrying content: application/json: schema: oneOf: - $ref: '#/components/schemas/ApiError' - $ref: '#/components/schemas/AuthError' components: schemas: AmendKalshiOrderRequest: type: object properties: price: type: string description: >- Limit price per contract in dollars, as a decimal string on the market's YES book. A price off that market's tick grid is rejected. example: '0.38' count: type: string description: >- The order's already filled count plus the resting count wanted after the amend. example: '10' required: - price - count additionalProperties: false AmendKalshiOrderResponse: type: object properties: order: $ref: '#/components/schemas/KalshiOrderView' previous: type: object properties: price: type: string description: >- Limit price per contract in dollars the order carried before the amend. example: '0.37' count: type: string description: Size in contracts the order carried before the amend. example: '8' required: - price - count required: - order - previous 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 title: API Error AuthError: type: object properties: error: type: object properties: code: $ref: '#/components/schemas/AuthErrorCode' message: type: string description: Plain-text explanation of the error. required: - code - message required: - error title: Auth Error KalshiOrderView: type: object properties: queuePosition: type: string nullable: true description: >- Contracts ahead of this order in price-time priority, or null when unavailable. orderId: type: string format: uuid description: Issued order id. example: 3f8b2c9a-2d18-4f7e-9c2a-1b6e1f0c8a4d ticker: type: string description: Kalshi market ticker the order trades. example: KXPRES-2028 side: $ref: '#/components/schemas/KalshiOrderSide' type: $ref: '#/components/schemas/KalshiOrderType' count: type: string description: Order size in contracts, as a decimal string. example: '10' yesPrice: type: string nullable: true description: Limit price per YES contract in dollars, or null when unavailable. noPrice: type: string nullable: true description: >- Complementary limit price per NO contract in dollars, or null when unavailable. outcomeSide: $ref: '#/components/schemas/KalshiOutcomeSide' price: type: string nullable: true description: >- Deprecated; use yesPrice for the limit price per YES contract in dollars. example: '0.38' deprecated: true postOnly: type: boolean description: Whether the order was placed as maker-only. example: false status: $ref: '#/components/schemas/TradingOrderStatus' venueOrderId: type: string nullable: true description: Kalshi order id, or null until the venue acknowledges the order. example: b4d9e1f2-3a6c-4d8e-9f1a-2b3c4d5e6f70 createdAt: type: string description: Time the order was created, in ISO-8601. example: '2026-07-26T12:00:00.000Z' updatedAt: type: string description: Time the order was last updated, in ISO-8601. example: '2026-07-26T12:05:00.000Z' filledCount: type: string nullable: true description: >- Contracts filled so far as a decimal string, or null before any fill. example: '4' averageYesPrice: type: string nullable: true description: >- Fill-weighted average price per YES contract in dollars, or null before any fill. averageNoPrice: type: string nullable: true description: >- Complementary fill-weighted average price per NO contract in dollars, or null before any fill. averagePrice: type: string nullable: true description: >- Deprecated; use averageYesPrice for the fill-weighted average price per YES contract in dollars. example: '0.3725' deprecated: true feesCents: type: integer nullable: true description: >- Total fees charged, rounded to the nearest whole cent, or null before any fill. example: 6 feesUsd: type: string nullable: true description: >- Total fees charged in dollars, exact to the granularity the venue charges, or null before any fill. Charged on top of the executed notional, so it is additive to cost on a buy and deducted from proceeds on a sell. example: '0.063000' closedAt: type: string nullable: true description: Time the order reached a terminal state, or null while still open. example: '2026-07-26T12:10:00.000Z' clientOrderId: type: string description: >- Your own identifier for this order as you supplied it, otherwise its orderId. example: order-1 required: - orderId - ticker - side - type - count - yesPrice - noPrice - outcomeSide - price - postOnly - status - venueOrderId - createdAt - updatedAt - filledCount - averageYesPrice - averageNoPrice - averagePrice - feesCents - feesUsd - closedAt - clientOrderId ApiErrorCode: type: string enum: - INVALID_REQUEST - NOT_FOUND - INSUFFICIENT_BALANCE - IDEMPOTENCY_CONFLICT - ORDER_NOT_CANCELLABLE - ORDER_RECONCILIATION_REQUIRED - RATE_LIMITED - INTERNAL_ERROR description: Stable identifier for the error category. AuthErrorCode: type: string enum: - UNAUTHORIZED - BAD_CONTENT_HASH - FORBIDDEN - RATE_LIMITED - AUTH_UNAVAILABLE description: Stable identifier for the error category. KalshiOrderSide: type: string enum: - BID - ASK description: |- Order direction on the market's YES book. | Side | Meaning | | --- | --- | | `BID` | Buy YES contracts, profiting if the market resolves YES. | | `ASK` | Sell YES contracts, profiting if the market resolves NO. | Selling YES is the same order as buying NO, so `ASK` covers both. example: BID KalshiOrderType: type: string enum: - LIMIT description: Order type. Kalshi orders are limit orders. example: LIMIT KalshiOutcomeSide: type: string enum: - 'YES' - 'NO' description: Economic direction of an order, YES for BID and NO for ASK. example: 'YES' 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` | At the venue, outcome not yet known. Either not yet acknowledged, or an immediate-or-cancel order acknowledged but not yet settled. | | `OPEN` | Resting on the venue, and cancellable. | | `FILLED` | Fully filled. | | `CANCELLED` / `REJECTED` | Terminal. | example: OPEN ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.