$param['key_public'] = 'ВАШ_ПУБЛИЧНЫЙ_API_КЛЮЧ';
$param['sign'] = md5('ВАШ_ПРИВАТНЫЙ_API_КЛЮЧ');

$ch = curl_init('https://exchange-assets.com/api/privat/balances/');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($param));
$response = curl_exec($ch);
curl_close($ch);

{
  "result":"success",
  "balances": [
    {
      "currency": "usd",
      "available": "100",
      "reserved": "0.1",
      "advertising": "3"
    },
    {
      "currency": "btc",
      "available": "0.01",
      "reserved": "0.1",
      "advertising": "1"
    }
    ...
  ]
}

$param['key_public'] = 'ВАШ_ПУБЛИЧНЫЙ_API_КЛЮЧ';
$param['sign'] = md5('ВАШ_ПРИВАТНЫЙ_API_КЛЮЧ');

$ch = curl_init('https://exchange-assets.com/api/privat/addresses/');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($param));
$response = curl_exec($ch);
curl_close($ch);
			

{
  "result":"success",
  "addresses": [
    {
      "currency": "btc",
      "address": "3M6e9RU11yXYKY5JNmJsJKG2kLs9Tdb8yD",
      "payment_id": ""
    },
    {
      "currency": "ltc",
      "address": "MWqrpZAVxyy33wGZXWwE3hcEG8nsfUVDDV",
      "payment_id": ""
    }
    ...
  ]
}

$param['key_public'] = 'ВАШ_ПУБЛИЧНЫЙ_API_КЛЮЧ';
$param['sign'] = md5('ВАШ_ПРИВАТНЫЙ_API_КЛЮЧ');
$param['currency'] = 'btc_usd';
$param['type'] = 'btc_usd';
$param['from'] = 1586000000;
$param['to'] = 1586000000;
$param['limit'] = 10;

$ch = curl_init('https://exchange-assets.com/api/privat/transfers/');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($param));
$response = curl_exec($ch);
curl_close($ch);
			

{
  "result":"success",
  "transfers": [
    {
      "currency": "btc",
      "address": "MWqrpZAVxyy33wGZXWwE3hcEG8nsfUVDDV",
      "payment_id": "MWqrpZAVxyy33wGZXWwE3hcEG8nsfUVDDV",
      "amount": "0.01",
      "type": "deposit",
      "status": "wait",
      "timestamp":"1586000000",
      "id": "1",
      
    },
    {
      "currency": "btc",
      "address": "MWqrpZAVxyy33wGZXWwE3hcEG8nsfUVDDV",
      "payment_id": "MWqrpZAVxyy33wGZXWwE3hcEG8nsfUVDDV",
      "amount": "0.02",
      "type": "withdrawal",
      "status": "done",
      "timestamp":"1587000000",
      "id": "2",
      
    }
    ...
  ]
}

$param['key_public'] = 'ВАШ_ПУБЛИЧНЫЙ_API_КЛЮЧ';
$param['sign'] = md5('ВАШ_ПРИВАТНЫЙ_API_КЛЮЧ');
$param['pair'] = 'btc_usd';

$ch = curl_init('https://exchange-assets.com/api/privat/orders/');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($param));
$response = curl_exec($ch);
curl_close($ch);
			

{
  "result":"success",
  "orders": [
    {
      "price":"4900",
      "amount":"0.01", 
      "pair":"btc_usd",
      "type":"buy",
      "timestamp":"1586000000",
      "oid":"1"
    },
    {
      "price":"4900",
      "amount":"0.01",
      "pair":"btc_usd",
      "type":"buy",
      "timestamp":"1586000000",
      "oid":"2"
    },
    ...
  ]
}

$param['key_public'] = 'ВАШ_ПУБЛИЧНЫЙ_API_КЛЮЧ';
$param['sign'] = md5('ВАШ_ПРИВАТНЫЙ_API_КЛЮЧ');
$param['pair'] = 'btc_usd';
$param['type'] = 'buy';
$param['amount'] = 0.05;
$param['price'] = 5000;

$ch = curl_init('https://exchange-assets.com/api/privat/order_create/');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($param));
$response = curl_exec($ch);
curl_close($ch);
			

{
  "result":"success",
  "trades": [
    {
      "price":"4900",
      "amount":"0.01", 
      "pair":"btc_usd",
      "type":"buy",
      "timestamp":"1586000000",
      "trade_id":"1"
    },
    ...
  ]
  "order": [
    {
      "price":"4900",
      "amount":"0.01",
      "pair":"btc_usd",
      "type":"buy",
      "timestamp":"1586000000",
      "order_id":"2"
    }
  ]
}

$param['key_public'] = 'ВАШ_ПУБЛИЧНЫЙ_API_КЛЮЧ';
$param['sign'] = md5('ВАШ_ПРИВАТНЫЙ_API_КЛЮЧ');
$param['oids'] = array(1, 2, 3);

$ch = curl_init('https://exchange-assets.com/api/privat/order_cancel/');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($param));
$response = curl_exec($ch);
curl_close($ch);
			

[
  {
    "result":"success",
    "oid":"1"
  },
  {
    "result":"success",
    "oid":"2"
  }
  ...          
]

$param['key_public'] = 'ВАШ_ПУБЛИЧНЫЙ_API_КЛЮЧ';
$param['sign'] = md5('ВАШ_ПРИВАТНЫЙ_API_КЛЮЧ');
$param['pair'] = 'btc_usd';
$param['from'] = 1586000000;
$param['to'] = 1586000000;
$param['limit'] = 10;

$ch = curl_init('https://exchange-assets.com/api/privat/trades/');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($param));
$response = curl_exec($ch);
curl_close($ch);
			

{
  "result":"success",
  "trades": [
    {
      "price":"4900",
      "amount":"0.01", 
      "pair":"btc_usd",
      "type":"buy",
      "timestamp":"1586000000",
      "id":"1",
      "oid":"1"
    },
    {
      "price":"4950",
      "amount":"0.01",
      "pair":"btc_usd",
      "type":"sell",
      "timestamp":"1586000000",
      "id":"2",
      "oid":"2"
    },
    ...
  ]
}