curl --request GET \
  --url https://astreus.ai/api/v1/countries \
  --header 'X-API-KEY: <api-key>'

import requests

url = "https://astreus.ai/api/v1/countries"

headers = {"X-API-KEY": "<api-key>"}

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

print(response.text)

const options = {method: 'GET', headers: {'X-API-KEY': '<api-key>'}};

fetch('https://astreus.ai/api/v1/countries', 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://astreus.ai/api/v1/countries",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "X-API-KEY: <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://astreus.ai/api/v1/countries"

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

	req.Header.Add("X-API-KEY", "<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://astreus.ai/api/v1/countries")
  .header("X-API-KEY", "<api-key>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://astreus.ai/api/v1/countries")

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

request = Net::HTTP::Get.new(url)
request["X-API-KEY"] = '<api-key>'

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

{
  "countries": [
    {
      "code": "SA",
      "name": "Saudi Arabia",
      "alpha_3": "SAU",
      "currency_code": "SAR",
      "region": "Asia",
      "sub_region": "Western Asia",
      "population": 36973555,
      "market_value_usd": 2484030748197,
      "gdp_usd_bn": 1276.94293333333,
      "gdp_local_bn": 4775.83,
      "gdp_local_currency": "SAR",
      "gdp_growth": 1.8181477975463423,
      "real_gdp_growth": 4.502466,
      "real_gdp_growth_basis": "published_yoy",
      "periods": {
        "population": "2025-01-01",
        "gdp": "2025-01-01",
        "real_gdp_growth": "2025-01-01",
        "nominal_gdp_growth": "2025-01-01",
        "inflation": "2025-12-01",
        "debt_to_gdp": null
      },
      "inflation": 2.0634211701652543,
      "debt_to_gdp": null,
      "risk_score": null,
      "risk_band": null,
      "sp_rating": null,
      "sources": {
        "gdp": {
          "name": "FRED",
          "fullName": "FRED · World Bank",
          "url": "https://fred.stlouisfed.org/series/MKTGDPSAA646NWDB",
          "note": "Retrieved from FRED (Federal Reserve Bank of St. Louis); original source: World Bank — World Development Indicators"
        },
        "population": {
          "name": "FRED",
          "fullName": "FRED · World Bank",
          "url": "https://fred.stlouisfed.org/series/POPTOTSAA647NWDB",
          "note": "Retrieved from FRED (Federal Reserve Bank of St. Louis); original source: World Bank — World Development Indicators"
        },
        "inflation": {
          "name": "GCC-Stat",
          "fullName": "GCC Statistical Center (GCC-Stat) · Marsa data portal",
          "url": "https://dp.marsa.gccstat.org/dataexplorer/?ds=DF_ES_CPI",
          "note": "GCC-Stat consumer prices (monthly, 2018=100) — dataflow DF_ES_CPI"
        },
        "real_gdp_growth": {
          "name": "World Bank",
          "fullName": "World Bank · World Development Indicators",
          "url": "https://data.worldbank.org/indicator/NY.GDP.MKTP.KD.ZG?locations=SA",
          "note": "WDI indicator NY.GDP.MKTP.KD.ZG"
        }
      },
      "nominal_gdp_growth": 1.8181477975463423
    },
    {
      "code": "BH",
      "name": "Bahrain",
      "alpha_3": "BHR",
      "currency_code": "BHD",
      "region": "Asia",
      "sub_region": "Western Asia",
      "population": 1600366,
      "market_value_usd": 15852000723,
      "gdp_usd_bn": 48.9657255319149,
      "gdp_local_bn": 18.4111128,
      "gdp_local_currency": "BHD",
      "gdp_growth": 3.7173598423613217,
      "real_gdp_growth": 3.481376,
      "real_gdp_growth_basis": "published_yoy",
      "periods": {
        "population": "2025-01-01",
        "gdp": "2025-01-01",
        "real_gdp_growth": "2025-01-01",
        "nominal_gdp_growth": "2025-01-01",
        "inflation": "2025-12-01",
        "debt_to_gdp": null
      },
      "inflation": 0.4891410682840931,
      "debt_to_gdp": null,
      "risk_score": null,
      "risk_band": null,
      "sp_rating": null,
      "sources": {
        "gdp": {
          "name": "FRED",
          "fullName": "FRED · World Bank",
          "url": "https://fred.stlouisfed.org/series/MKTGDPBHA646NWDB",
          "note": "Retrieved from FRED (Federal Reserve Bank of St. Louis); original source: World Bank — World Development Indicators"
        },
        "population": {
          "name": "FRED",
          "fullName": "FRED · World Bank",
          "url": "https://fred.stlouisfed.org/series/POPTOTBHA647NWDB",
          "note": "Retrieved from FRED (Federal Reserve Bank of St. Louis); original source: World Bank — World Development Indicators"
        },
        "inflation": {
          "name": "GCC-Stat",
          "fullName": "GCC Statistical Center (GCC-Stat) · Marsa data portal",
          "url": "https://dp.marsa.gccstat.org/dataexplorer/?ds=DF_ES_CPI",
          "note": "GCC-Stat consumer prices (monthly, 2018=100) — dataflow DF_ES_CPI"
        },
        "real_gdp_growth": {
          "name": "World Bank",
          "fullName": "World Bank · World Development Indicators",
          "url": "https://data.worldbank.org/indicator/NY.GDP.MKTP.KD.ZG?locations=BH",
          "note": "WDI indicator NY.GDP.MKTP.KD.ZG"
        }
      },
      "nominal_gdp_growth": 3.7173598423613217
    }
  ],
  "sort": "real_gdp_growth",
  "order": "desc",
  "total": 213,
  "limit": 2,
  "offset": 0,
  "hasMore": true,
  "nextOffset": 2,
  "page": {
    "total": 213,
    "offset": 0,
    "limit": 2,
    "nextOffset": 2
  }
}

{
  "error": "<string>",
  "code": "unknown_parameter",
  "param": "<string>",
  "allowed": [
    "<string>"
  ]
}

{
  "error": "<string>",
  "code": "unknown_parameter",
  "param": "<string>",
  "allowed": [
    "<string>"
  ]
}

{
  "error": "<string>",
  "code": "unknown_parameter",
  "param": "<string>",
  "allowed": [
    "<string>"
  ]
}

{
  "error": "<string>",
  "code": "unknown_parameter",
  "param": "<string>",
  "allowed": [
    "<string>"
  ]
}