curl --request GET \
  --url https://api.kraken.com/v0/insto/custody/vaults/{vault_id}/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}/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}/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}/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))

}

{
  "quote_value": "12345.6789",
  "quote_value_change_24h": "1.50",
  "missing_rates": [
    {
      "asset": "BTC",
      "asset_class": "currency"
    }
  ],
  "quote_asset": "USD"
}

{
  "type": "tag:kraken.com,2025:BadRequest",
  "status": 400,
  "title": "Bad Request",
  "data": {
    "message": "Invalid quote_asset parameter."
  },
  "detail": "Invalid quote_asset 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"
}