curl --request GET \
  --url https://api.kraken.com/v0/insto/custody/vaults/{vault_id}/assets/balances \
  --header 'api-key: <api-key>' \
  --header 'api-nonce: <api-key>' \
  --header 'api-sign: <api-key>'

import requests

url = "https://api.kraken.com/v0/insto/custody/vaults/{vault_id}/assets/balances"

headers = {
    "api-key": "<api-key>",
    "api-sign": "<api-key>",
    "api-nonce": "<api-key>"
}

response = requests.get(url, headers=headers)

print(response.text)

const options = {
  method: 'GET',
  headers: {'api-key': '<api-key>', 'api-sign': '<api-key>', 'api-nonce': '<api-key>'}
};

fetch('https://api.kraken.com/v0/insto/custody/vaults/{vault_id}/assets/balances', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

	url := "https://api.kraken.com/v0/insto/custody/vaults/{vault_id}/assets/balances"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("api-key", "<api-key>")
	req.Header.Add("api-sign", "<api-key>")
	req.Header.Add("api-nonce", "<api-key>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

{
  "result": [
    {
      "asset": "BTC",
      "asset_class": "currency",
      "name": "Bitcoin",
      "name_full": "Bitcoin",
      "symbol": "BTC",
      "decimals": 8,
      "display_decimals": 8,
      "rate_decimals": 8,
      "funding_decimals": 8,
      "min_lot": "0.00010000",
      "reserve": false,
      "virtual": true,
      "metadata": {
        "color_code": "#F7931A"
      },
      "balance": "1.50000000",
      "quote_value_change_24h": "1.25",
      "spot_balance": "1.50000000",
      "hold_balance": "0.00000000",
      "available_balance": "1.50000000",
      "pledged_balance": "0.00000000",
      "quote_value": "97500.00",
      "quote_spot_value": "97500.00",
      "quote_available_value": "97500.00",
      "quote_price": "65000.00"
    },
    {
      "asset": "USD",
      "asset_class": "currency",
      "name": "US Dollar",
      "name_full": "US Dollar",
      "symbol": "USD",
      "decimals": 4,
      "display_decimals": 2,
      "rate_decimals": 4,
      "funding_decimals": 4,
      "min_lot": "0.0100",
      "reserve": false,
      "virtual": false,
      "metadata": {
        "color_code": "#85BB65"
      },
      "balance": "10000.0000",
      "spot_balance": "10000.0000",
      "hold_balance": "0.0000",
      "available_balance": "10000.0000",
      "quote_value": "10000.00",
      "quote_spot_value": "10000.00",
      "quote_available_value": "10000.00",
      "quote_price": "1.0000"
    }
  ],
  "quote_asset": "USD"
}

{
  "type": "tag:kraken.com,2025:BadRequest",
  "status": 400,
  "title": "Bad Request",
  "data": {
    "message": "Invalid quote parameter."
  },
  "detail": "Invalid quote parameter.",
  "instance": "https://debug.kraken.com/req/01HXYZABCDEF"
}

{
  "type": "tag:kraken.com,2025:PermissionDenied",
  "status": 403,
  "title": "Forbidden",
  "data": {
    "message": "Permission denied."
  },
  "detail": "The caller is not authorized to perform this action.",
  "instance": "https://debug.kraken.com/req/01HXYZABCDEF"
}

{
  "type": "tag:kraken.com,2025:gateway/ReadUpstream",
  "status": 500,
  "title": "Internal Server Error",
  "data": "<unknown>",
  "detail": "Failed to read response from upstream custody service.",
  "instance": "https://debug.kraken.com/req/01HXYZABCDEF"
}

{
  "type": "tag:kraken.com,2025:gateway/Connect",
  "status": 503,
  "title": "Service Unavailable",
  "data": {},
  "detail": "Downstream custody service is temporarily unreachable; retry with backoff.",
  "instance": "https://debug.kraken.com/req/01HXYZABCDEF"
}