Ethereum Client = new Ethereum("YOU_TLKEN");

Ethereum Client = new Ethereum("YOU_TLKEN", "https://mainnet-api.blocksdk.com");

Map<String, Object> data = Client.GetBlockchainInfo().join();
System.out.println(data);

Map<String, Object> data = new HashMap<>();
data.put("contract_address", "0xf5de760f2e916647fd766b4ad9e85ff943ce3a2b");
data.put("offset", "0");
data.put("limit", "10");

Map<String, Object> result = Client.GetSingleNfts(data).join();
System.out.println(result);