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POST
/
v1
/
order
/
{orderId}
/
modify
Modify Order
curl --request POST \
  --url https://api.polymarket.us/v1/order/{orderId}/modify \
  --header 'Content-Type: application/json' \
  --header 'X-PM-Access-Key: <api-key>' \
  --header 'X-PM-Signature: <api-key>' \
  --header 'X-PM-Timestamp: <api-key>' \
  --data '
{
  "marketSlug": "<string>",
  "quantity": 123,
  "participateDontInitiate": true,
  "goodTillTime": "<string>"
}
'
{}

Authorizations

​
X-PM-Access-Key
string
header
required

Your API key ID (UUID). Generate at polymarket.us/developer.

​
X-PM-Timestamp
string
header
required

Unix timestamp in milliseconds. Must be within 30 seconds of server time.

​
X-PM-Signature
string
header
required

Base64-encoded Ed25519 signature of timestamp + method + path. See Authentication for details.

Path Parameters

​
orderId
string
required

Exchange-assigned Order ID to modify

Body

application/json

Request to modify an existing order

Request to modify an existing order

​
marketSlug
string

Unique market slug for the order being modified

​
price
object

New order price and currency

​
quantity
number<double>

Order quantity in contracts. Supports decimal quantities on markets whose minimumTradeQty is less than 1.

​
tif
enum<string>

New order time in force

Available options:
TIME_IN_FORCE_DAY,
TIME_IN_FORCE_GOOD_TILL_CANCEL,
TIME_IN_FORCE_GOOD_TILL_DATE,
TIME_IN_FORCE_IMMEDIATE_OR_CANCEL,
TIME_IN_FORCE_FILL_OR_KILL
​
participateDontInitiate
boolean

Order must rest on the book prior to matching (maker only)

​
goodTillTime
string

Good till time for orders with TIME_IN_FORCE_GOOD_TILL_DATE

Response

Order modified successfully

Response for order modification (empty on success)