curl --request GET \
  --url https://api.omnibook.xyz/v1/exchange/retention \
  --header 'DX-ACCESS-KEY: <api-key>' \
  --header 'DX-ACCESS-SIGNATURE: <api-key>' \
  --header 'DX-ACCESS-TIMESTAMP: <api-key>'

import requests

url = "https://api.omnibook.xyz/v1/exchange/retention"

headers = {
    "DX-ACCESS-KEY": "<api-key>",
    "DX-ACCESS-TIMESTAMP": "<api-key>",
    "DX-ACCESS-SIGNATURE": "<api-key>"
}

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

print(response.text)

const options = {
  method: 'GET',
  headers: {
    'DX-ACCESS-KEY': '<api-key>',
    'DX-ACCESS-TIMESTAMP': '<api-key>',
    'DX-ACCESS-SIGNATURE': '<api-key>'
  }
};

fetch('https://api.omnibook.xyz/v1/exchange/retention', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.omnibook.xyz/v1/exchange/retention",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "DX-ACCESS-KEY: <api-key>",
    "DX-ACCESS-SIGNATURE: <api-key>",
    "DX-ACCESS-TIMESTAMP: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

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

func main() {

	url := "https://api.omnibook.xyz/v1/exchange/retention"

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

	req.Header.Add("DX-ACCESS-KEY", "<api-key>")
	req.Header.Add("DX-ACCESS-TIMESTAMP", "<api-key>")
	req.Header.Add("DX-ACCESS-SIGNATURE", "<api-key>")

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

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

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.get("https://api.omnibook.xyz/v1/exchange/retention")
  .header("DX-ACCESS-KEY", "<api-key>")
  .header("DX-ACCESS-TIMESTAMP", "<api-key>")
  .header("DX-ACCESS-SIGNATURE", "<api-key>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.omnibook.xyz/v1/exchange/retention")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Get.new(url)
request["DX-ACCESS-KEY"] = '<api-key>'
request["DX-ACCESS-TIMESTAMP"] = '<api-key>'
request["DX-ACCESS-SIGNATURE"] = '<api-key>'

response = http.request(request)
puts response.read_body

{
  "tape_cap": 256,
  "terminal_cap": 256,
  "reject_cap": 256,
  "fill_cap": 256
}

{
  "error": {
    "code": "unauthorized",
    "num": null,
    "origin": "gateway",
    "message": "unauthorized",
    "details": null
  }
}

{
  "error": {
    "code": "missing_scope",
    "num": null,
    "origin": "gateway",
    "message": "missing_scope",
    "details": null
  }
}

{
  "error": {
    "code": "rate_limited",
    "num": null,
    "origin": "gateway",
    "message": "rate limited",
    "details": {
      "retry_after_ms": "10"
    }
  }
}