Skip to main content
POST
/
v1
/
orders
/
create_order
Create order
curl --request POST \
  --url https://github.com/openpx-trade/openpx/v1/orders/create_order \
  --header 'Content-Type: application/json' \
  --data '
{
  "asset_id": "<string>",
  "price": 123,
  "size": 123,
  "order_type": "gtc"
}
'
{
  "created_at": "2023-11-07T05:31:56Z",
  "filled": 123,
  "id": "<string>",
  "market_ticker": "<string>",
  "outcome": "<string>",
  "price": 123,
  "size": 123,
  "fee": null,
  "updated_at": null
}
Submit a new order.

Body

application/json

Input for create_order.

​
asset_id
string
required

The orderable asset — Kalshi market ticker or Polymarket CTF token id (e.g. "KXBTCD-25APR1517").

​
outcome
required

Outcome to trade. Options: yes, no, or label: "<name>" (Polymarket categorical markets only).

Available options:
yes,
no
​
price
number<double>
required

Limit price as YES probability in (0, 1) (e.g. 0.62).

​
side
enum<string>
required

Order direction. Options: buy, sell.

Available options:
buy,
sell
​
size
number<double>
required

Order size in contracts (e.g. 100.0).

​
order_type
enum<string>
default:gtc

Time-in-force; defaults to gtc (options: gtc, ioc, fok).

Available options:
gtc,
ioc,
fok

Response

Success.

An order on the unified surface.

​
created_at
string<date-time>
required

Order creation time (UTC) (e.g. "2026-04-25T12:00:00Z").

​
filled
number<double>
required

Cumulative filled size in contracts (e.g. 25.0).

​
id
string
required

Globally-unique exchange order id (e.g. "a1b2c3d4-...").

​
market_ticker
string
required

Unified market ticker the order belongs to (e.g. "KXBTCD-25APR1517").

​
outcome
string
required

Outcome label as published by the exchange (e.g. "Yes", "No", or a categorical label).

​
price
number<double>
required

Limit price as YES probability in (0, 1) (e.g. 0.62).

​
side
enum<string>
required

Order direction. Options: buy, sell.

Available options:
buy,
sell
​
size
number<double>
required

Order size in contracts (e.g. 100.0).

​
status
enum<string>
required

Order lifecycle state. Options: pending, open, filled, partially_filled, cancelled, rejected.

Available options:
pending,
open,
filled,
partially_filled,
cancelled,
rejected
​
fee
number<double> | null

Volume-weighted per-contract fee in quote dollars; null on Polymarket and on unfilled orders.

​
updated_at
string<date-time> | null

Last update time (UTC); null if untouched since creation.