Cancel order | Hyperliquid exchange

Cancels one or multiple open orders by order ID (oid) on the Hyperliquid exchange. Available on Hyperliquid exchange via Chainstack.

POST /exchange

Cancel order

cURL

curl --request POST \
  --url https://api.hyperliquid.xyz/exchange \
  --header 'Content-Type: application/json' \
  --data '
{
  "action": {
    "type": "cancel",
    "cancels": [
      {
        "a": 0,
        "o": 123456789
      }
    ]
  },
  "nonce": 1705234567890,
  "signature": {
    "r": "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef",
    "s": "0xfedcba0987654321fedcba0987654321fedcba0987654321fedcba0987654321",
    "v": 27
  },
  "vaultAddress": null
}
'

200

{
  "status": "ok",
  "response": {
    "type": "cancel",
    "data": {
      "statuses": [
        "success"
      ]
    }
  }
}

You can only use this endpoint on the official Hyperliquid public API. It is not available through Chainstack, as the open-source node implementation does not support it yet. See Hyperliquid methods for the full availability breakdown.

This endpoint requires signature authentication. See our comprehensive Authentication via Signatures guide for implementation details.

Cancels one or multiple open orders by order ID (oid) on the Hyperliquid exchange.

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Parameters

Required parameters

• action (object, required) — The cancel action object containing:

  • type (string) — Must be "cancel"
  • cancels (array) — Array of cancel objects with:
    • a (number) — Asset index
    • o (number) — Order ID to cancel

• nonce (number, required) — Current timestamp in milliseconds (must be recent)

• signature (object, required) — EIP-712 signature of the action

Optional parameters

• vaultAddress (string, optional) — Address when trading on behalf of a vault or subaccount
• expiresAfter (number, optional) — Timestamp in milliseconds after which the request is rejected

Returns

Returns an object with cancellation status:

• status — "ok" if request processed
• response — Contains cancellation details:
  • type — "cancel"
  • data.statuses — Array of status results:
    • "success" — Order successfully canceled
    • error — Object with error message if cancellation failed

Example request

cURL

curl -X POST https://api.hyperliquid.xyz/exchange \
  -H "Content-Type: application/json" \
  -d '{
    "action": {
      "type": "cancel",
      "cancels": [{
        "a": 0,
        "o": 77738308
      }]
    },
    "nonce": 1234567890123,
    "signature": {...}
  }'

Response examples

Successful cancellation

{
  "status": "ok",
  "response": {
    "type": "cancel",
    "data": {
      "statuses": [
        "success"
      ]
    }
  }
}

Failed cancellation

{
  "status": "ok",
  "response": {
    "type": "cancel",
    "data": {
      "statuses": [{
        "error": "Order was never placed, already canceled, or filled."
      }]
    }
  }
}

Multiple orders mixed results

{
  "status": "ok",
  "response": {
    "type": "cancel",
    "data": {
      "statuses": [
        "success",
        {
          "error": "Order was never placed, already canceled, or filled."
        }
      ]
    }
  }
}

Use cases

• Risk management — Quickly cancel orders when market conditions change
• Order management — Clean up open orders that are no longer needed
• Algorithmic trading — Programmatically manage order lifecycle
• Portfolio rebalancing — Cancel orders before placing new ones

You can cancel multiple orders in a single request by including multiple objects in the cancels array. Each cancellation is processed independently.

Attempting to cancel an order that doesn’t exist, was already canceled, or was filled will return an error but won’t affect other cancellations in the same request.

Body

application/json

action · object · required

Show child attributes

nonce · integer · required

Current timestamp in milliseconds

signature · object · required

EIP-712 signature of the action with r, s, v components

Show child attributes

vaultAddress · string | null

Address when trading on behalf of a vault or subaccount (optional)

expiresAfter · integer

Timestamp in milliseconds after which the request is rejected (optional)

Response

200 - application/json

Cancellation result

status · string

Request status

response · object

Show child attributes