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POST
/
v2
/
clob
/
orders
/
{orderId}
/
cancel
curl -X POST https://api.pmx.trade/v2/clob/orders/b2c3d4e5-.../cancel \
  -H "Content-Type: application/json" \
  -d '{
    "pubkey": "7xKXabc123...",
    "signature": "base64CancelSignature..."
  }'

{
  "success": true
}
Cancels an order and releases any committed collateral or tokens back to your available balance. Requires an Ed25519 signature to prove ownership.

​
Path parameters

​
orderId
string
required
The order UUID to cancel.

​
Request body

​
pubkey
string
required
The Solana wallet public key (base58-encoded). Must match the order owner.
​
signature
string
required
Ed25519 signature of the cancel message PMX Cancel:<orderId>, base64-encoded.

​
Cancel Signing Format

Sign the following string with your wallet’s Ed25519 key: 
PMX Cancel:<orderId>
For example, for order b2c3d4e5-1234-5678-abcd-ef0123456789: 
PMX Cancel:b2c3d4e5-1234-5678-abcd-ef0123456789

​
Response

​
success
boolean
true if the order was successfully cancelled.
curl -X POST https://api.pmx.trade/v2/clob/orders/b2c3d4e5-.../cancel \
  -H "Content-Type: application/json" \
  -d '{
    "pubkey": "7xKXabc123...",
    "signature": "base64CancelSignature..."
  }'

{
  "success": true
}
You can only cancel orders you own. If the signature doesn’t match the order owner, the request returns 403 INVALID_SIGNATURE.