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POST
/
kalshi
/
order
/
cancel
cURL
curl --request POST \
  --url https://api.example.com/kalshi/order/cancel \
  --header 'Content-Type: application/json' \
  --data '
{
  "chain": "base",
  "orderId": "abc123",
  "userAddress": "0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266",
  "signature": "0x...",
  "expiry": 1234567890
}
'
{
  "success": true,
  "orderId": "<string>",
  "message": "<string>"
}

Body

application/json
​
chain
enum<string>
required

Chain to execute the action on; one of: base, bsc

Available options:
base,
bsc
Example:

"base"

​
orderId
string
required

Kalshi order ID to cancel

Example:

"abc123"

​
userAddress
string
required

User wallet address

Example:

"0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266"

​
signature
string
required

EIP-712 signature from the user authorizing the cancellation

Example:

"0x..."

​
expiry
number
required

Unix timestamp when the authorization expires

Example:

1234567890

Response

Order cancelled successfully

​
success
boolean
required
​
orderId
string
required
​
message
string