curl --request GET \
  --url https://api.messari.io/metrics/v2/protocols/etfs/metrics \
  --header 'X-Messari-API-Key: <api-key>'

import requests

url = "https://api.messari.io/metrics/v2/protocols/etfs/metrics"

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

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

print(response.text)

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

fetch('https://api.messari.io/metrics/v2/protocols/etfs/metrics', 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.messari.io/metrics/v2/protocols/etfs/metrics",
  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-Messari-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://api.messari.io/metrics/v2/protocols/etfs/metrics"

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

	req.Header.Add("X-Messari-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://api.messari.io/metrics/v2/protocols/etfs/metrics")
  .header("X-Messari-API-Key", "<api-key>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.messari.io/metrics/v2/protocols/etfs/metrics")

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

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

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

{
  "error": null,
  "data": {
    "datasets": [
      {
        "grain": "providers",
        "slug": "overview",
        "granularities": [
          "1d"
        ],
        "metrics": [
          {
            "name": "Timestamp",
            "slug": "time",
            "description": "Timestamp of the data point.",
            "is_timestamp": true
          },
          {
            "name": "AUM (USD)",
            "slug": "aum-usd",
            "description": "Assets under management across the provider's crypto ETF products in USD. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "Flow (USD)",
            "slug": "flow-usd",
            "description": "Daily net flow across the provider's crypto ETF products in USD. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "Product Count",
            "slug": "num-products",
            "description": "Number of active products with positive AUM. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "Weighted Expense Ratio",
            "slug": "weighted-aum-expense-ratio",
            "description": "AUM-weighted average expense ratio. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "Bitcoin AUM Share",
            "slug": "bitcoin-aum-perc",
            "description": "Share of AUM in bitcoin products (0-1). Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "Spot AUM Share",
            "slug": "spot-aum-perc",
            "description": "Share of AUM in delta-one (spot) products (0-1). Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "Rolling 30d Flow (USD)",
            "slug": "rolling-30d-flow-usd",
            "description": "Rolling 30-day net flow in USD. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "AUM 30d Change",
            "slug": "aum-30d-change-perc",
            "description": "AUM change versus 30 days ago as a ratio. Sourced from Blockworks Research.",
            "is_timestamp": false
          }
        ]
      },
      {
        "grain": "assets",
        "slug": "overview",
        "granularities": [
          "1d"
        ],
        "metrics": [
          {
            "name": "Timestamp",
            "slug": "time",
            "description": "Timestamp of the data point.",
            "is_timestamp": true
          },
          {
            "name": "Spot AUM (USD)",
            "slug": "type-spot-aum-usd",
            "description": "Spot product AUM in USD. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "Spot Flow (USD)",
            "slug": "type-spot-flow-usd",
            "description": "Spot product daily net flow in USD. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "Spot Product Count",
            "slug": "type-spot-product-count",
            "description": "Number of spot products. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "Futures AUM (USD)",
            "slug": "type-futures-aum-usd",
            "description": "Futures product AUM in USD. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "Futures Flow (USD)",
            "slug": "type-futures-flow-usd",
            "description": "Futures product daily net flow in USD. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "Futures Product Count",
            "slug": "type-futures-product-count",
            "description": "Number of futures products. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "US Spot AUM (USD)",
            "slug": "type-spot-unitedstates-aum-usd",
            "description": "US spot product AUM in USD. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "US Spot Flow (USD)",
            "slug": "type-spot-unitedstates-flow-usd",
            "description": "US spot product daily net flow in USD. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "US Spot Product Count",
            "slug": "type-spot-unitedstates-product-count",
            "description": "Number of US spot products. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "Europe Spot AUM (USD)",
            "slug": "type-spot-europe-aum-usd",
            "description": "European spot product AUM in USD. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "Europe Spot Flow (USD)",
            "slug": "type-spot-europe-flow-usd",
            "description": "European spot product daily net flow in USD. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "Europe Spot Product Count",
            "slug": "type-spot-europe-product-count",
            "description": "Number of European spot products. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "APAC Spot AUM (USD)",
            "slug": "type-spot-apac-aum-usd",
            "description": "APAC spot product AUM in USD. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "APAC Spot Flow (USD)",
            "slug": "type-spot-apac-flow-usd",
            "description": "APAC spot product daily net flow in USD. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "APAC Spot Product Count",
            "slug": "type-spot-apac-product-count",
            "description": "Number of APAC spot products. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "Delta-One AUM (USD)",
            "slug": "strategy-deltaone-aum-usd",
            "description": "Delta-one strategy AUM in USD. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "Delta-One Flow (USD)",
            "slug": "strategy-deltaone-flow-usd",
            "description": "Delta-one strategy daily net flow in USD. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "Delta-One Product Count",
            "slug": "strategy-deltaone-product-count",
            "description": "Number of delta-one products. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "Leveraged AUM (USD)",
            "slug": "strategy-leveraged-aum-usd",
            "description": "Leveraged strategy AUM in USD. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "Leveraged Flow (USD)",
            "slug": "strategy-leveraged-flow-usd",
            "description": "Leveraged strategy daily net flow in USD. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "Leveraged Product Count",
            "slug": "strategy-leveraged-product-count",
            "description": "Number of leveraged products. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "Total Volume (USD)",
            "slug": "total-volume-usd",
            "description": "Total traded volume in USD. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "US Volume (USD)",
            "slug": "volume-unitedstates-usd",
            "description": "US traded volume in USD. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "Europe Volume (USD)",
            "slug": "volume-europe-usd",
            "description": "European traded volume in USD. Sourced from Blockworks Research.",
            "is_timestamp": false
          },
          {
            "name": "APAC Volume (USD)",
            "slug": "volume-apac-usd",
            "description": "APAC traded volume in USD. Sourced from Blockworks Research.",
            "is_timestamp": false
          }
        ]
      }
    ]
  }
}

{
  "data": "<unknown>",
  "error": "<string>"
}

{
  "data": "<unknown>",
  "error": "<string>"
}

{
  "data": "<unknown>",
  "error": "<string>"
}