NDAX OMS Orders API
The OMS Orders API from NDAX — 15 operation(s) for oms orders.
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OpenAPI Specification
openapi: 3.2.0
info:
title: Ndax Pro OMS Orders API
version: '2026-10-13'
description: 'Generated by API Evangelist from the Ndax Pro API reference at https://apidoc.ndax.io (Slate). Ndax is built on AlphaPoint: every function is documented as a JSON payload sent inside a message frame {m,i,n,o} over wss://api.ndax.io/WSGateway/. Public functions also answer over HTTP at https://api.ndax.io:8443/AP/{FunctionName} (Ping, GetInstruments and GetProducts verified live 2026-10-13). Each path here is a documented function name; this is NOT a provider-published contract.'
contact:
url: https://ndax.io/support
termsOfService: https://ndax.io/en/legal/account-agreements
x-generated-from: documentation
x-provenance: generated
x-authored-by: API Evangelist
x-generated: '2026-10-13'
x-generator: deterministic parse of https://apidoc.ndax.io section headings, Category/Permissions/CallType lines and request/response examples (no model)
servers:
- url: https://api.ndax.io:8443/AP
description: Ndax AlphaPoint HTTP gateway
security:
- apiKeySignature: []
tags:
- name: OMS Orders
paths:
/CancelAllOrders:
post:
operationId: cancelAllOrders
summary: Cancel All Orders
description: 'Cancels all open matching orders for the specified account on an Order Management System. A user with Trading permission can cancel orders for himselfd; a user with Operator permissions can cancel orders for any account, instrument, or user. Note: Multiple users may have access to the same account. Requires an authenticated session; the documentation states authentication happens over the WebSocket gateway (wss://api.ndax.io/WSGateway/).'
tags:
- OMS Orders
x-category: User
x-permissions: Operator, Trading
x-call-type: Synchronous
x-docs-url: https://apidoc.ndax.io/#cancelallorders
x-websocket-function: CancelAllOrders
requestBody:
required: false
content:
application/json:
schema:
type: object
responses:
'200':
description: Function reply payload.
content:
application/json:
schema: {}
example:
result: true
errormsg: ''
errorcode: 0
detail: ''
x-requires-session: true
/CancelOrder:
post:
operationId: cancelOrder
summary: Cancel Order
description: Cancels an open order that has been placed but has not yet been fully executed. A user with Trading permission can cancel an order only for an account with which he is associated; a user with Operator permission can cancel an order for any account. Requires an authenticated session; the documentation states authentication happens over the WebSocket gateway (wss://api.ndax.io/WSGateway/).
tags:
- OMS Orders
x-category: User
x-permissions: Operator, Trading
x-call-type: Synchronous
x-docs-url: https://apidoc.ndax.io/#cancelorder
x-websocket-function: CancelOrder
requestBody:
required: false
content:
application/json:
schema:
type: object
responses:
'200':
description: Function reply payload.
content:
application/json:
schema: {}
x-requires-session: true
/CancelQuote:
post:
operationId: cancelQuote
summary: Cancel Quote
description: 'Cancels a quote that has not been executed yet. Note: Quoting is not enabled for the retail end user of the AlphaPoint software. Only registered market participants or marketmakers may quote. Only a user with Operator permission can cancel quotes for another user. Requires an authenticated session; the documentation states authentication happens over the WebSocket gateway (wss://api.ndax.io/WSGateway/).'
tags:
- OMS Orders
x-category: User
x-permissions: Operator, Marketmaker
x-call-type: Synchronous
x-docs-url: https://apidoc.ndax.io/#cancelquote
x-websocket-function: CancelQuote
requestBody:
required: false
content:
application/json:
schema:
type: object
example:
omsId: 0
accountId: 0
instrumentId: 0
bidQuoteId: 0
askQuoteId: 0
responses:
'200':
description: Function reply payload.
content:
application/json:
schema: {}
x-requires-session: true
/CancelReplaceOrder:
post:
operationId: cancelReplaceOrder
summary: Cancel Replace Order
description: 'CancelReplaceOrder is a single API call that both cancels an existing order and replaces it with a new order. Canceling one order and replacing it with another also cancels the order’s priority in the order book. You can use ModifyOrder to preserve priority in the book; but ModifyOrder only allows a reduction in order quantity. Warning: CancelReplaceOrder sacrifices the order''s priority in the order book. Requires an authenticated session; the documentation states authentication happens over the WebSocket gateway (wss://api.ndax.io/WSGateway/).'
tags:
- OMS Orders
x-category: User
x-permissions: Operator, Trading
x-call-type: Synchronous
x-docs-url: https://apidoc.ndax.io/#cancelreplaceorder
x-websocket-function: CancelReplaceOrder
requestBody:
required: false
content:
application/json:
schema:
type: object
example:
omsId: 0
orderIdToReplace: 0
clientOrdId: 0
orderType: 0
side: 0
accountId: 0
instrumentId: 0
useDisplayQuantity: false
displayQuantity: 0.0
limitPrice: 0.0
stopPrice: 0.0
referencePrice: 0.0
pegPriceType: 0
timeInForce: 0
orderIdOCO: 0
quantity: 0.0
responses:
'200':
description: Function reply payload.
content:
application/json:
schema: {}
x-requires-session: true
/CreateQuote:
post:
operationId: createQuote
summary: Create Quote
description: 'TK call and response may change Creates a quote. A quote expresses a willingness to buy or sell at a given price. Both a quote and an order will execute. Only a user with Operator or MarketMaker permission can create a quote. Note: Quoting is not enabled for the retail end user of AlphaPoint software. Only registered market participants or market makers may quote. Requires an authenticated session; the documentation states authentication happens over the WebSocket gateway (wss://api.ndax.io/WSGateway/).'
tags:
- OMS Orders
x-category: User
x-permissions: Operator, MarketMaker
x-call-type: Synchronous
x-docs-url: https://apidoc.ndax.io/#createquote
x-websocket-function: CreateQuote
requestBody:
required: false
content:
application/json:
schema:
type: object
responses:
'200':
description: Function reply payload.
content:
application/json:
schema: {}
x-requires-session: true
/GetOpenOrders:
post:
operationId: getOpenOrders
summary: Get Open Orders
description: Returns an array of 0 or more orders that have not yet been filled (open orders) for a single account on a specific Order Management System. The call returns an empty array if an account has no open orders. A user with Trading or AccountReadOnly permission must be associated with the account named by AccountId; a user with Operator permissoin can get open orders for any account. Requires an authenticated session; the documentation states authentication happens over the WebSocket gateway (wss://api.ndax.io/WSGateway/).
tags:
- OMS Orders
x-category: User
x-permissions: Operator, Trading, AccountReadOnly
x-call-type: Synchronous
x-docs-url: https://apidoc.ndax.io/#getopenorders
x-websocket-function: GetOpenOrders
requestBody:
required: false
content:
application/json:
schema:
type: object
responses:
'200':
description: Function reply payload.
content:
application/json:
schema: {}
example:
- Side: Buy
OrderId: 0
Price: 0.0
Quantity: 0.0
DisplayQuantity: 0.0
Instrument: 0
Account: 0
OrderType: Unknown
ClientOrderId: 0
OrderState: Unknown
ReceiveTime: 0
ReceiveTimeTicks: 0
OrigQuantity: 0.0
QuantityExecuted: 0.0
AvgPrice: 0.0
CounterPartyId: 0
ChangeReason: Unknown
OrigOrderId: 0
OrigClOrdId: 0
EnteredBy: 0
IsQuote: false
InsideAsk: 0.0
InsideAskSize: 0.0
InsideBid: 0.0
InsideBidSize: 0.0
LastTradePrice: 0.0
RejectReason: ''
IsLockedIn: false
CancelReason: ''
OMSId: 0
x-requires-session: true
/GetOpenQuotes:
post:
operationId: getOpenQuotes
summary: Get Open Quotes
description: Returns the current bid and ask quotes for a given instrument ID and account ID. Requires an authenticated session; the documentation states authentication happens over the WebSocket gateway (wss://api.ndax.io/WSGateway/).
tags:
- OMS Orders
x-category: User
x-permissions: Operator, MarketMaker
x-call-type: Synchronous
x-docs-url: https://apidoc.ndax.io/#getopenquotes
x-websocket-function: GetOpenQuotes
requestBody:
required: false
content:
application/json:
schema:
type: object
responses:
'200':
description: Function reply payload.
content:
application/json:
schema: {}
example:
bid:
omsId: 0
side: 0
orderId: 0
price: 0.0
quantity: 0.0
displayQuantity: 0.0
instrument: 0
account: 0
orderType: 0
clientOrderId: 0
orderState: 0
ask:
omsId: 0
side: 0
orderId: 0
price: 0.0
quantity: 0.0
displayQuantity: 0.0
instrument: 0
account: 0
orderType: 0
clientOrderId: 0
orderState: 0
x-requires-session: true
/GetOrderFee:
post:
operationId: getOrderFee
summary: Get Order Fee
description: Returns an estimate of the transaction fee for a specific order side, instrument, and order type. Fees are set and calculated by the operator of the trading venue. The exchange generally deducts fees from the "receiving" side of the trade (although an operator can modify this). There are two products in every trade (and in every instrument); for example, the instrument BTCUSD comprises a BitCoin product and a US dollar product. Placing a buy order on the book causes fees to be deducted from Product 1, in this case, BitCoin; placing a sell order causes fees to be deducted from Product 2, in thi Requires an authenticated session; the documentation states authentication happens over the WebSocket gateway (wss://api.ndax.io/WSGateway/).
tags:
- OMS Orders
x-category: User
x-permissions: Operator, Trading
x-call-type: Synchronous
x-docs-url: https://apidoc.ndax.io/#getorderfee
x-websocket-function: GetOrderFee
requestBody:
required: false
content:
application/json:
schema:
type: object
example:
omsId: 0
accountId: 0
instrumentId: 0
productId: 0
amount: 0.0
price: 0.0
orderType: 0
makerTaker: 0
side: 0
responses:
'200':
description: Function reply payload.
content:
application/json:
schema: {}
x-requires-session: true
/GetOrderHistory:
post:
operationId: getOrderHistory
summary: Get Order History
description: Returns a complete list of all orders, both open and executed, for a specific account on the specified Order Management System. The account named in the request must be associated with the calling user. Requires an authenticated session; the documentation states authentication happens over the WebSocket gateway (wss://api.ndax.io/WSGateway/).
tags:
- OMS Orders
x-category: User
x-permissions: Trading, AccountReadOnly
x-call-type: Synchronous
x-docs-url: https://apidoc.ndax.io/#getorderhistory
x-websocket-function: GetOrderHistory
requestBody:
required: false
content:
application/json:
schema:
type: object
responses:
'200':
description: Function reply payload.
content:
application/json:
schema: {}
example:
- Side: Buy
OrderId: 0
Price: 0.0
Quantity: 0.0
DisplayQuantity: 0.0
Instrument: 0
Account: 0
OrderType: Unknown
ClientOrderId: 0
OrderState: Unknown
ReceiveTime: 0
ReceiveTimeTicks: 0
OrigQuantity: 0.0
QuantityExecuted: 0.0
AvgPrice: 0.0
CounterPartyId: 0
ChangeReason: Unknown
OrigOrderId: 0
OrigClOrdId: 0
EnteredBy: 0
IsQuote: false
InsideAsk: 0.0
InsideAskSize: 0.0
InsideBid: 0.0
InsideBidSize: 0.0
LastTradePrice: 0.0
RejectReason: ''
IsLockedIn: false
CancelReason: ''
OMSId: 0
x-requires-session: true
/GetOrderHistoryByOrderId:
post:
operationId: getOrderHistoryByOrderId
summary: Get Order History By Order Id
description: Retrieves the full order history of a specific order by its order ID, including any changes. A user with Trading permission can retrieve an order history only for the user's accounts and instruments; a user with Operator permission can retrieve all accounts and instruments. Requires an authenticated session; the documentation states authentication happens over the WebSocket gateway (wss://api.ndax.io/WSGateway/).
tags:
- OMS Orders
x-category: User
x-permissions: Operator, Trading
x-call-type: Synchronous
x-docs-url: https://apidoc.ndax.io/#getorderhistorybyorderid
x-websocket-function: GetOrderHistoryByOrderId
requestBody:
required: false
content:
application/json:
schema:
type: object
example:
omsId: 0
orderId: 0
responses:
'200':
description: Function reply payload.
content:
application/json:
schema: {}
example:
- Side: Buy
OrderId: 0
Price: 0.0
Quantity: 0.0
DisplayQuantity: 0.0
Instrument: 0
Account: 0
OrderType: Unknown
ClientOrderId: 0
OrderState: Unknown
ReceiveTime: 0
ReceiveTimeTicks: 0
OrigQuantity: 0.0
QuantityExecuted: 0.0
AvgPrice: 0.0
CounterPartyId: 0
ChangeReason: Unknown
OrigOrderId: 0
OrigClOrdId: 0
EnteredBy: 0
IsQuote: false
InsideAsk: 0.0
InsideAskSize: 0.0
InsideBid: 0.0
InsideBidSize: 0.0
LastTradePrice: 0.0
RejectReason: ''
IsLockedIn: false
CancelReason: ''
OMSId: 0
x-requires-session: true
/GetOrdersHistory:
post:
operationId: getOrdersHistory
summary: Get Orders History
description: Retrieves an array of multiple orders (hence, GetOrdersHistory with plural Orders ) for the specified account, order ID, user, instrument, or time stamp. The history starts at index i , where i is an integer identifying a specific order (the most recent order has an index of 0). “Depth” is the count of trades to report backwards from startIndex . All values in the call other than OMSId are optional. For example, if depth = 200 and startIndex = 0, the history returns 200 orders into the past starting with the most recent (0) order. If depth = 200 and startIndex = 100, the history returns 200 or Requires an authenticated session; the documentation states authentication happens over the WebSocket gateway (wss://api.ndax.io/WSGateway/).
tags:
- OMS Orders
x-category: User
x-permissions: Operator, Trading
x-call-type: Synchronous
x-docs-url: https://apidoc.ndax.io/#getordershistory
x-websocket-function: GetOrdersHistory
requestBody:
required: false
content:
application/json:
schema:
type: object
example:
omsId: 0
accountId: 0
clientOrderId: 0
originalOrderId: 0
originalClientOrderId: 0
userId: 0
instrumentId: 0
startTimestamp: 0
endTimestamp: 0
depth: 100
startIndex: 0
responses:
'200':
description: Function reply payload.
content:
application/json:
schema: {}
example:
- Side: Buy
OrderId: 0
Price: 0.0
Quantity: 0.0
DisplayQuantity: 0.0
Instrument: 0
Account: 0
OrderType: Unknown
ClientOrderId: 0
OrderState: Unknown
ReceiveTime: 0
ReceiveTimeTicks: 0
OrigQuantity: 0.0
QuantityExecuted: 0.0
AvgPrice: 0.0
CounterPartyId: 0
ChangeReason: Unknown
OrigOrderId: 0
OrigClOrdId: 0
EnteredBy: 0
IsQuote: false
InsideAsk: 0.0
InsideAskSize: 0.0
InsideBid: 0.0
InsideBidSize: 0.0
LastTradePrice: 0.0
RejectReason: ''
IsLockedIn: false
CancelReason: ''
OMSId: 0
x-requires-session: true
/GetOrderStatus:
post:
operationId: getOrderStatus
summary: Get Order Status
description: Retrieves the status information for a single order. A user with Trading permission can retrieve status information for accounts and orders with which the user is associated; a user with Operator permission can retreive status information for any account or order ID. Requires an authenticated session; the documentation states authentication happens over the WebSocket gateway (wss://api.ndax.io/WSGateway/).
tags:
- OMS Orders
x-category: User
x-permissions: Operator, Trading
x-call-type: Synchronous
x-docs-url: https://apidoc.ndax.io/#getorderstatus
x-websocket-function: GetOrderStatus
requestBody:
required: false
content:
application/json:
schema:
type: object
responses:
'200':
description: Function reply payload.
content:
application/json:
schema: {}
example:
- Side: Buy
OrderId: 0
Price: 0.0
Quantity: 0.0
DisplayQuantity: 0.0
Instrument: 0
Account: 0
OrderType: Unknown
ClientOrderId: 0
OrderState: Unknown
ReceiveTime: 0
ReceiveTimeTicks: 0
OrigQuantity: 0.0
QuantityExecuted: 0.0
AvgPrice: 0.0
CounterPartyId: 0
ChangeReason: Unknown
OrigOrderId: 0
OrigClOrdId: 0
EnteredBy: 0
IsQuote: false
InsideAsk: 0.0
InsideAskSize: 0.0
InsideBid: 0.0
InsideBidSize: 0.0
LastTradePrice: 0.0
RejectReason: ''
IsLockedIn: false
CancelReason: ''
OMSId: 0
x-requires-session: true
/ModifyOrder:
post:
operationId: modifyOrder
summary: Modify Order
description: 'Reduces an order’s quantity without losing priority in the order book. An order’s quantity can only be reduced. The other call that can modify an order — CancelReplaceOrder — resets order book priority, but you can use it to increase an order. Note: ModifyOrder does not surrender or reset order book priority. Requires an authenticated session; the documentation states authentication happens over the WebSocket gateway (wss://api.ndax.io/WSGateway/).'
tags:
- OMS Orders
x-category: User
x-permissions: Operator, Trading
x-call-type: Synchronous
x-docs-url: https://apidoc.ndax.io/#modifyorder
x-websocket-function: ModifyOrder
requestBody:
required: false
content:
application/json:
schema:
type: object
responses:
'200':
description: Function reply payload.
content:
application/json:
schema: {}
x-requires-session: true
/SendOrder:
post:
operationId: sendOrder
summary: Send Order
description: 'Creates an order. Anyone submitting an order should also subscribe to the various market data and event feeds, or call GeOpenOrders or GetOrderStatus to monitor the status of the order. If the order is not in a state to be executed, GetOpenOrders will not return it. A user with Trading permission can create an order only for those accounts and instruments with which the user is associated; a user with Operator permissions can create an order for any account and instrument. Note: Call Type is asynchronous. Requires an authenticated session; the documentation states authentication happens over the WebSocket gateway (wss://api.ndax.io/WSGateway/).'
tags:
- OMS Orders
x-category: User
x-permissions: Operator, Trading
x-call-type: Asynchronous
x-docs-url: https://apidoc.ndax.io/#sendorder
x-websocket-function: SendOrder
requestBody:
required: false
content:
application/json:
schema:
type: object
example:
InstrumentId: 1
OMSId: 1
AccountId: 1
TimeInForce: 1
ClientOrderId: 1
OrderIdOCO: 0
UseDisplayQuantity: false
Side: 0
quantity: 1
OrderType: 2
PegPriceType: 3
LimitPrice: 8800
responses:
'200':
description: Function reply payload.
content:
application/json:
schema: {}
x-requires-session: true
/UpdateQuote:
post:
operationId: updateQuote
summary: Update Quote
description: Updates an existing quote. Quoting is not enabled for the retail end user of the AlphaPoint software. Only registered market participants or market makers may quote. Warning **UpdateQuote** resets the quote's priority in the order book. Requires an authenticated session; the documentation states authentication happens over the WebSocket gateway (wss://api.ndax.io/WSGateway/).
tags:
- OMS Orders
x-category: User
x-permissions: Operator, MarketMaker
x-call-type: Synchronous
x-docs-url: https://apidoc.ndax.io/#updatequote
x-websocket-function: UpdateQuote
requestBody:
required: false
content:
application/json:
schema:
type: object
example:
OMSId: 0
AccountId: 0
InstrumentId: 0
BidQuoteId: 0
Bid: 0
BidQTY: 0
AskQuoteId: 0
Ask: 0
AskQTY: 0
responses:
'200':
description: Function reply payload.
content:
application/json:
schema: {}
x-requires-session: true
components:
securitySchemes:
apiKeySignature:
type: apiKey
in: header
name: Authorization
x-source: https://apidoc.ndax.io/#authenticateuser