curl --request POST \
  --url https://mcp.echozero.app/api/v1/auth/check-username \
  --header 'Content-Type: application/json' \
  --header 'x-signature: <x-signature>' \
  --header 'x-timestamp: <x-timestamp>' \
  --data '
{
  "username": "existing_user"
}
'

import requests

url = "https://mcp.echozero.app/api/v1/auth/check-username"

payload = { "username": "existing_user" }
headers = {
    "x-signature": "<x-signature>",
    "x-timestamp": "<x-timestamp>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'x-signature': '<x-signature>',
    'x-timestamp': '<x-timestamp>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({username: 'existing_user'})
};

fetch('https://mcp.echozero.app/api/v1/auth/check-username', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

const options = {
  method: 'POST',
  headers: {
    'x-signature': '<x-signature>',
    'x-timestamp': '<x-timestamp>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({username: 'existing_user'})
};

fetch('https://mcp.echozero.app/api/v1/auth/check-username', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

package main

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

func main() {

	url := "https://mcp.echozero.app/api/v1/auth/check-username"

	payload := strings.NewReader("{\n  \"username\": \"existing_user\"\n}")

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

	req.Header.Add("x-signature", "<x-signature>")
	req.Header.Add("x-timestamp", "<x-timestamp>")
	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))

}

{
  "success": true,
  "data": true
}