curl --request PATCH \
  --url https://api.messari.io/user-management/v1/watchlists/{id}/assets \
  --header 'Content-Type: */*' \
  --header 'X-Messari-API-Key: <api-key>' \
  --data '
{
  "assetIds": [
    "<string>"
  ]
}
'

import requests

url = "https://api.messari.io/user-management/v1/watchlists/{id}/assets"

payload = { "assetIds": ["<string>"] }
headers = {
    "X-Messari-API-Key": "<api-key>",
    "Content-Type": "*/*"
}

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

print(response.text)

const options = {
  method: 'PATCH',
  headers: {'X-Messari-API-Key': '<api-key>', 'Content-Type': '*/*'},
  body: JSON.stringify({assetIds: ['<string>']})
};

fetch('https://api.messari.io/user-management/v1/watchlists/{id}/assets', 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/user-management/v1/watchlists/{id}/assets",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PATCH",
  CURLOPT_POSTFIELDS => json_encode([
    'assetIds' => [
        '<string>'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: */*",
    "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"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.messari.io/user-management/v1/watchlists/{id}/assets"

	payload := strings.NewReader("{\n  \"assetIds\": [\n    \"<string>\"\n  ]\n}")

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

	req.Header.Add("X-Messari-API-Key", "<api-key>")
	req.Header.Add("Content-Type", "*/*")

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

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

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.patch("https://api.messari.io/user-management/v1/watchlists/{id}/assets")
  .header("X-Messari-API-Key", "<api-key>")
  .header("Content-Type", "*/*")
  .body("{\n  \"assetIds\": [\n    \"<string>\"\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.messari.io/user-management/v1/watchlists/{id}/assets")

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

request = Net::HTTP::Patch.new(url)
request["X-Messari-API-Key"] = '<api-key>'
request["Content-Type"] = '*/*'
request.body = "{\n  \"assetIds\": [\n    \"<string>\"\n  ]\n}"

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

{
  "error": null,
  "data": {
    "id": "BA3FDA7B",
    "title": "DeFi Blue Chips",
    "assetIds": [
      "1e31218a-e44e-4285-820c-8282ee222035",
      "21c795f5-1bfd-40c3-858e-e9d7e820c6d0",
      "b3d5d66c-26a2-404c-9325-91dc714a722b"
    ],
    "createdAt": "2026-03-27T14:11:02.612968Z",
    "updatedAt": "2026-03-27T14:11:27.836661Z"
  }
}

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

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

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

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