diff --git a/src/main/java/me/bobert/netneutrality/command/admin/ReactionCommand.java b/src/main/java/me/bobert/netneutrality/command/admin/ReactionCommand.java
index 02656fa..2d1a5d0 100644
--- a/src/main/java/me/bobert/netneutrality/command/admin/ReactionCommand.java
+++ b/src/main/java/me/bobert/netneutrality/command/admin/ReactionCommand.java
@@ -44,21 +44,25 @@ public class ReactionCommand extends AbstractAdminCommand {
         builder.addSubcommandGroups(
                 new SubcommandGroupData("emoji", "Give roles to users using emojis").addSubcommands(
                         new SubcommandData("setup", "Add a role to a message").addOptions(
-                                new OptionData(OptionType.STRING, "messageid", "The ID of the message", true),
+                                new OptionData(OptionType.STRING, "messageid", "The ID of the message", true)
+                                        .setRequiredLength(19, 19),
                                 new OptionData(OptionType.STRING, "emoji", "Emoji associated with the role", true),
                                 new OptionData(OptionType.ROLE, "role", "Role to add to the emoji", true)
                         ),
                         new SubcommandData("add", "Add a role to an existing message").addOptions(
-                                new OptionData(OptionType.STRING, "messageid", "The ID of the message", true),
+                                new OptionData(OptionType.STRING, "messageid", "The ID of the message", true)
+                                        .setRequiredLength(19, 19),
                                 new OptionData(OptionType.STRING, "emoji", "Emoji associated with the role", true),
                                 new OptionData(OptionType.ROLE, "role", "Role to add to the emoji", true)
                         ),
                         new SubcommandData("remove", "Remove a role from a message").addOptions(
-                                new OptionData(OptionType.STRING, "messageid", "The ID of the message", true),
+                                new OptionData(OptionType.STRING, "messageid", "The ID of the message", true)
+                                        .setRequiredLength(19, 19),
                                 new OptionData(OptionType.STRING, "emoji", "Emoji to remove from the message", true)
                         ),
                         new SubcommandData("delete", "Remove all roles from a message").addOptions(
                                 new OptionData(OptionType.STRING, "messageid", "The ID of the message", true)
+                                        .setRequiredLength(19, 19)
                         )
                 )
         );
diff --git a/src/main/java/me/bobert/netneutrality/command/bot/ConfigureCommand.java b/src/main/java/me/bobert/netneutrality/command/bot/ConfigureCommand.java
index bca39aa..10831e4 100644
--- a/src/main/java/me/bobert/netneutrality/command/bot/ConfigureCommand.java
+++ b/src/main/java/me/bobert/netneutrality/command/bot/ConfigureCommand.java
@@ -49,7 +49,7 @@ public class ConfigureCommand extends AbstractAdminCommand {
     public void registerCommandOptions(CommandOptionsBuilder builder) {
         builder.addSubcommands(
                 new SubcommandData("music-volume", "Volume for the music player")
-                        .addOptions(new OptionData(OptionType.INTEGER, "volume", "Integer between 0 and 100", true)
+                        .addOptions(new OptionData(OptionType.INTEGER, "volume", "Playback volume for every session", true)
                                 .setRequiredRange(0, 100)),
                 new SubcommandData("error-logging", "Send errors to #error and/or #log channel")
                         .addOption(OptionType.BOOLEAN, "debug", "Enable or disable the fonctionnality", true),
diff --git a/src/main/java/me/bobert/netneutrality/command/crypto/CryptoPriceCommand.java b/src/main/java/me/bobert/netneutrality/command/crypto/CryptoPriceCommand.java
index 69b405c..2fc8fed 100644
--- a/src/main/java/me/bobert/netneutrality/command/crypto/CryptoPriceCommand.java
+++ b/src/main/java/me/bobert/netneutrality/command/crypto/CryptoPriceCommand.java
@@ -14,6 +14,7 @@ import me.bobert.netneutrality.core.command.options.CommandOptionsBuilder;
 import me.bobert.netneutrality.core.context.CommandContext;
 import me.bobert.netneutrality.http.WebModule;
 import net.dv8tion.jda.api.interactions.commands.OptionType;
+import net.dv8tion.jda.api.interactions.commands.build.OptionData;
 import org.json.JSONObject;
 
 import java.text.NumberFormat;
@@ -22,7 +23,9 @@ import java.util.Locale;
 
 public class CryptoPriceCommand extends AbstractCommand {
 
+    private final String exchange = "Coinbase";
     private final String baseURL = "https://min-api.cryptocompare.com/data/price";
+    private final String exchangeApi = String.format("https://min-api.cryptocompare.com/data/v4/all/exchanges?e=%s", exchange);
 
     @Override
     public boolean needAdmin() {
@@ -51,8 +54,11 @@ public class CryptoPriceCommand extends AbstractCommand {
 
     @Override
     public void registerCommandOptions(CommandOptionsBuilder builder) {
-        builder.addOption(OptionType.STRING, "symbol", "The crypto symbol to fetch price for", true);
-        builder.addOption(OptionType.STRING, "currency", "In which currency should the price be displayed");
+        builder.addOptions(
+                new OptionData(OptionType.STRING, "symbol", "The crypto symbol to fetch price for", true),
+                new OptionData(OptionType.STRING, "currency", "In which currency should the price be displayed")
+                        .setRequiredLength(3, 3)
+        );
     }
 
     @Override
@@ -62,6 +68,7 @@ public class CryptoPriceCommand extends AbstractCommand {
 
     @Override
     public CommandExecutionResult execute(CommandContext context) {
+        //TODO: implement cache
         Locale usa = new Locale("en", "US");
         NumberFormat dollarFormat = NumberFormat.getCurrencyInstance(usa);
         dollarFormat.setMaximumFractionDigits(24);
@@ -78,6 +85,10 @@ public class CryptoPriceCommand extends AbstractCommand {
         String finalCurrency = currency.toUpperCase();
         context.async(asyncMessage -> {
             try {
+                if (!validateSymbol(symbol)) {
+                    asyncMessage.edit("Crypto doesn't exist.. yet");
+                    return;
+                }
 
                 WebModule http = new WebModule(String.format("%s?fsym=%s&tsyms=%s", baseURL, symbol, finalCurrency)).request();
                 JSONObject json = http.getAsObject();
@@ -100,4 +111,22 @@ public class CryptoPriceCommand extends AbstractCommand {
 
         return CommandExecutionResult.none();
     }
+
+    private boolean validateSymbol(String symbol) {
+        try {
+            WebModule http = new WebModule(exchangeApi).request();
+            JSONObject json = http.getAsObject();
+
+            JSONObject pairs = json.getJSONObject("Data")
+                    .getJSONObject("exchanges")
+                    .getJSONObject(exchange)
+                    .getJSONObject("pairs");
+
+            return pairs.has(symbol);
+
+        } catch (Exception e) {
+            LogHandler.log(e);
+            return false;
+        }
+    }
 }