curl --request POST \
  --url https://api.kraken.com/0/private/CreateOtcQuoteRequest \
  --header 'API-Key: <api-key>' \
  --header 'API-Sign: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "nonce": 123,
  "base": "BTC",
  "quote": "USD",
  "amount": "2.5",
  "total": "200000.5"
}
'

import requests

url = "https://api.kraken.com/0/private/CreateOtcQuoteRequest"

payload = {
    "nonce": 123,
    "base": "BTC",
    "quote": "USD",
    "amount": "2.5",
    "total": "200000.5"
}
headers = {
    "API-Key": "<api-key>",
    "API-Sign": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'API-Key': '<api-key>',
    'API-Sign': '<api-key>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({nonce: 123, base: 'BTC', quote: 'USD', amount: '2.5', total: '200000.5'})
};

fetch('https://api.kraken.com/0/private/CreateOtcQuoteRequest', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

package main

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

func main() {

	url := "https://api.kraken.com/0/private/CreateOtcQuoteRequest"

	payload := strings.NewReader("{\n  \"nonce\": 123,\n  \"base\": \"BTC\",\n  \"quote\": \"USD\",\n  \"amount\": \"2.5\",\n  \"total\": \"200000.5\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("API-Key", "<api-key>")
	req.Header.Add("API-Sign", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

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

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

	fmt.Println(string(body))

}

{
  "error": [
    "EGeneral:Invalid arguments"
  ],
  "result": {
    "quote": {
      "base": "BTC",
      "quote": "USD",
      "amount": "2.5",
      "settlement": "automated",
      "quote_id": "00001c47-8f59-4099-b6f8-b637437ef1ab",
      "client_order_id": "7264675290025181184",
      "price": "100000.25",
      "total": "250000.625"
    }
  }
}

{
  "errors": [
    {
      "field": null,
      "value": null,
      "type": "Internal Error",
      "msg": "Internal error",
      "severity": "E",
      "errorClass": "General"
    }
  ]
}