curl --request POST \
  --url https://beaconcha.in/api/v2/ethereum/validators/balances \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "validator": {
    "validator_identifiers": [
      1
    ]
  },
  "epoch": 1,
  "chain": "mainnet",
  "cursor": "",
  "page_size": 10
}
'

import requests

url = "https://beaconcha.in/api/v2/ethereum/validators/balances"

payload = {
    "validator": { "validator_identifiers": [1] },
    "epoch": 1,
    "chain": "mainnet",
    "cursor": "",
    "page_size": 10
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    validator: {validator_identifiers: [1]},
    epoch: 1,
    chain: 'mainnet',
    cursor: '',
    page_size: 10
  })
};

fetch('https://beaconcha.in/api/v2/ethereum/validators/balances', 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://beaconcha.in/api/v2/ethereum/validators/balances",
  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([
    'validator' => [
        'validator_identifiers' => [
                1
        ]
    ],
    'epoch' => 1,
    'chain' => 'mainnet',
    'cursor' => '',
    'page_size' => 10
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($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://beaconcha.in/api/v2/ethereum/validators/balances"

	payload := strings.NewReader("{\n  \"validator\": {\n    \"validator_identifiers\": [\n      1\n    ]\n  },\n  \"epoch\": 1,\n  \"chain\": \"mainnet\",\n  \"cursor\": \"\",\n  \"page_size\": 10\n}")

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

	req.Header.Add("Authorization", "Bearer <token>")
	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://beaconcha.in/api/v2/ethereum/validators/balances")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"validator\": {\n    \"validator_identifiers\": [\n      1\n    ]\n  },\n  \"epoch\": 1,\n  \"chain\": \"mainnet\",\n  \"cursor\": \"\",\n  \"page_size\": 10\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://beaconcha.in/api/v2/ethereum/validators/balances")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"validator\": {\n    \"validator_identifiers\": [\n      1\n    ]\n  },\n  \"epoch\": 1,\n  \"chain\": \"mainnet\",\n  \"cursor\": \"\",\n  \"page_size\": 10\n}"

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

{
  "data": [
    {
      "validator": {
        "index": 1,
        "public_key": "<string>"
      },
      "balance": {
        "current": "<string>",
        "effective": "<string>"
      }
    }
  ],
  "range": {
    "slot": {
      "start": 1,
      "end": 1
    },
    "epoch": {
      "start": 1,
      "end": 1
    },
    "timestamp": {
      "start": 1,
      "end": 1
    }
  },
  "paging": {
    "next_cursor": "<string>"
  }
}

{
  "error": "Bad request. Please check your input and try again."
}

{
  "error": "Unauthorized. Please provide a valid API key."
}

{
  "error": "endpoint not allowed for your subscription tier. upgrade your subscription at https://beaconcha.in/pricing."
}

{
  "error": "The requested resource was not found."
}

{
  "error": "method not allowed: GET. all public API endpoints use POST."
}

{
  "error": "Rate limit exceeded. Please try again later."
}

{
  "error": "internal server error. please try again later."
}

{
  "error": "An unexpected error occurred."
}