curl --request POST \
  --url https://api.bigdata.com/v1/knowledge-graph/etfs \
  --header 'Content-Type: application/json' \
  --header 'X-API-KEY: <api-key>' \
  --data '
{
  "query": "Gold",
  "countries": [
    "US"
  ]
}
'

import requests

url = "https://api.bigdata.com/v1/knowledge-graph/etfs"

payload = {
    "query": "Gold",
    "countries": ["US"]
}
headers = {
    "X-API-KEY": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-KEY': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({query: 'Gold', countries: ['US']})
};

fetch('https://api.bigdata.com/v1/knowledge-graph/etfs', 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.bigdata.com/v1/knowledge-graph/etfs",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'query' => 'Gold',
    'countries' => [
        'US'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "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"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.bigdata.com/v1/knowledge-graph/etfs"

	payload := strings.NewReader("{\n  \"query\": \"Gold\",\n  \"countries\": [\n    \"US\"\n  ]\n}")

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

	req.Header.Add("X-API-KEY", "<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))

}

HttpResponse<String> response = Unirest.post("https://api.bigdata.com/v1/knowledge-graph/etfs")
  .header("X-API-KEY", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"query\": \"Gold\",\n  \"countries\": [\n    \"US\"\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.bigdata.com/v1/knowledge-graph/etfs")

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

request = Net::HTTP::Post.new(url)
request["X-API-KEY"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"query\": \"Gold\",\n  \"countries\": [\n    \"US\"\n  ]\n}"

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

[
  {
    "id": "36CEB2",
    "name": "Grayscale Bitcoin Trust ETF",
    "country": "US",
    "ticker": "GBTC",
    "description": "Grayscale Bitcoin Trust ETF, formerly Grayscale Bitcoin Trust (BTC), is an open-ended trust that is invested exclusively in bitcoin. The trust was founded on September 13, 2013.",
    "sector": "Financials",
    "industry_group": "Nonequity Investment Instruments",
    "industry": "Nonequity Investment Instruments",
    "webpage": "http://grayscale.com/products/grayscale-bitcoin-trust/",
    "favicon": "https://www.globalxetfs.com.au/favicon.ico",
    "isin_values": [
      "US3896371099"
    ],
    "cusip_values": [
      "389637109"
    ],
    "sedol_values": [
      "6605528"
    ],
    "listing_values": [
      "OTCM:GBTC"
    ]
  }
]