diff --git a/.eslintrc.json b/.eslintrc.json
index d9f2f558..f785763f 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -1,4 +1,5 @@
 {
+  "root": true,
   "extends": ["eslint:recommended", "plugin:prettier/recommended"],
   "plugins": ["import"],
   "parserOptions": {
diff --git a/package.json b/package.json
index 9c0848ee..33a0c78c 100644
--- a/package.json
+++ b/package.json
@@ -110,9 +110,9 @@
     "src/client/voice/receiver/PacketHandler.js": false,
     "src/client/voice/receiver/Receiver.js": false,
     "src/client/voice/util/PlayInterface.js": false,
-    "src/client/voice/util/Secretbox.js": false,
     "src/client/voice/util/Silence.js": false,
-    "src/client/voice/util/VolumeInterface.js": false
+    "src/client/voice/util/VolumeInterface.js": false,
+    "src/util/Sodium.js": false
   },
   "husky": {
     "hooks": {
diff --git a/src/client/Client.js b/src/client/Client.js
index 1d88cfac..01617b88 100644
--- a/src/client/Client.js
+++ b/src/client/Client.js
@@ -1,6 +1,7 @@
 'use strict';
 
 const BaseClient = require('./BaseClient');
+const InteractionClient = require('./InteractionClient');
 const ActionsManager = require('./actions/ActionsManager');
 const ClientVoiceManager = require('./voice/ClientVoiceManager');
 const WebSocketManager = require('./websocket/WebSocketManager');
@@ -103,6 +104,24 @@ class Client extends BaseClient {
         ? ShardClientUtil.singleton(this, process.env.SHARDING_MANAGER_MODE)
         : null;
 
+    /**
+     * The interaction client.
+     * @type {InteractionClient}
+     */
+    this.interactionClient = new InteractionClient(
+      options,
+      interaction => {
+        /**
+         * Emitted when an interaction is created.
+         * @event Client#interactionCreate
+         * @param {Interaction} interaction The interaction which was created.
+         */
+        this.client.emit(Events.INTERACTION_CREATE, interaction);
+        return null;
+      },
+      this,
+    );
+
     /**
      * All of the {@link User} objects that have been cached at any point, mapped by their IDs
      * @type {UserManager}
diff --git a/src/client/InteractionClient.js b/src/client/InteractionClient.js
new file mode 100644
index 00000000..d7d13065
--- /dev/null
+++ b/src/client/InteractionClient.js
@@ -0,0 +1,131 @@
+'use strict';
+
+const BaseClient = require('./BaseClient');
+const Interaction = require('../structures/Interaction');
+const { ApplicationCommandOptionType, InteractionType, InteractionResponseType } = require('../util/Constants');
+
+let sodium;
+
+/**
+ * Interaction client is used for interactions.
+ *
+ * ```js
+ * const client = new InteractionClient({
+ *   token: ABC,
+ *   publicKey: XYZ,
+ * }, async (interaction) => {
+ *   if (will take a long time) {
+ *     doSomethingLong.then((d) => {
+ *       interaction.reply({
+ *         content: 'wow that took long',
+ *       });
+ *     });
+ *     // return null to signal that we will be replying via `interaction.reply`.
+ *     return null;
+ *   }
+ *   return { content: 'hi!' };
+ * });
+ * ```
+ */
+class InteractionClient extends BaseClient {
+  /**
+   * @param {Options} options Options for the client.
+   * @param {Handler} handler Handler to handle things.
+   * @param {undefined} client For internal use.
+   */
+  constructor(options, handler, client) {
+    super(options);
+    this.client = client || this;
+    this.handler = handler;
+    this.publicKey = options.publicKey ? Buffer.from(options.publicKey, 'hex') : undefined;
+  }
+
+  getCommands(guildID) {
+    let path = this.client.api.applications('@me');
+    if (guildID) {
+      path = path.guilds(guildID);
+    }
+    return path.commands.get();
+  }
+
+  createCommand(command, guildID) {
+    let path = this.client.api.applications('@me');
+    if (guildID) {
+      path = path.guilds(guildID);
+    }
+    return path.commands.post({
+      data: {
+        name: command.name,
+        description: command.description,
+        options: command.options.map(function m(o) {
+          return {
+            type: ApplicationCommandOptionType[o.type],
+            name: o.name,
+            description: o.description,
+            default: o.default,
+            required: o.required,
+            choices: o.choices,
+            options: o.options.map(m),
+          };
+        }),
+      },
+    });
+  }
+
+  deleteCommand(commandID, guildID) {
+    let path = this.client.api.applications('@me');
+    if (guildID) {
+      path = path.guilds(guildID);
+    }
+    return path.commands(commandID).delete();
+  }
+
+  async handle(data) {
+    switch (data.type) {
+      case InteractionType.PING:
+        return {
+          type: InteractionResponseType.PONG,
+        };
+      case InteractionType.APPLICATION_COMMAND: {
+        try {
+          const interaction = new Interaction(this.client, data);
+          const result = await this.handler(interaction);
+          if (result === null) {
+            return {
+              type: InteractionResponseType.ACKNOWLEDGE,
+            };
+          }
+          // handle result as message resolvable here, probably DRY this branch with code in
+          // `Interaction#reply`, except `Interaction#reply` obviously does a POST and this just
+          // returns the data.
+          throw new Error('fucc');
+        } catch (e) {
+          this.client.emit('error', e);
+          return {
+            type: InteractionResponseType.ACKNOWLEDGE,
+          };
+        }
+      }
+      default:
+        throw new RangeError('Invalid interaction data');
+    }
+  }
+
+  async handleFromHTTP(body, signature) {
+    if (sodium === undefined) {
+      sodium = require('../util/Sodium');
+    }
+    if (!sodium.methods.verify(Buffer.from(signature, 'hex'), Buffer.from(body), this.publicKey)) {
+      throw new Error('Invalid signature');
+    }
+    const data = JSON.parse(body);
+    const result = await this.handle(data);
+    return JSON.stringify(result);
+  }
+
+  async handleFromGateway(data) {
+    await this.handle(data);
+  }
+}
+
+module.exports = InteractionClient;
diff --git a/src/client/actions/ActionsManager.js b/src/client/actions/ActionsManager.js
index 4055795a..31ba210c 100644
--- a/src/client/actions/ActionsManager.js
+++ b/src/client/actions/ActionsManager.js
@@ -37,6 +37,7 @@ class ActionsManager {
     this.register(require('./GuildIntegrationsUpdate'));
     this.register(require('./WebhooksUpdate'));
     this.register(require('./TypingStart'));
+    this.register(require('./InteractionCreate'));
   }
 
   register(Action) {
diff --git a/src/client/actions/InteractionCreate.js b/src/client/actions/InteractionCreate.js
new file mode 100644
index 00000000..c349a0eb
--- /dev/null
+++ b/src/client/actions/InteractionCreate.js
@@ -0,0 +1,15 @@
+'use strict';
+
+const Action = require('./Action');
+
+class InteractionCreateAction extends Action {
+  handle(data) {
+    this.client.interactionClient.handleFromGateway(data).catch(e => {
+      this.client.emit('error', e);
+    });
+
+    return {};
+  }
+}
+
+module.exports = InteractionCreateAction;
diff --git a/src/client/voice/dispatcher/StreamDispatcher.js b/src/client/voice/dispatcher/StreamDispatcher.js
index bb1c7bba..bd41d4f4 100644
--- a/src/client/voice/dispatcher/StreamDispatcher.js
+++ b/src/client/voice/dispatcher/StreamDispatcher.js
@@ -1,7 +1,7 @@
 'use strict';
 
 const { Writable } = require('stream');
-const secretbox = require('../util/Secretbox');
+const secretbox = require('../../../util/Sodium');
 const Silence = require('../util/Silence');
 const VolumeInterface = require('../util/VolumeInterface');
 
diff --git a/src/client/voice/receiver/PacketHandler.js b/src/client/voice/receiver/PacketHandler.js
index bf1a220a..807593ff 100644
--- a/src/client/voice/receiver/PacketHandler.js
+++ b/src/client/voice/receiver/PacketHandler.js
@@ -1,8 +1,8 @@
 'use strict';
 
 const EventEmitter = require('events');
+const sodium = require('../../../util/Sodium');
 const Speaking = require('../../../util/Speaking');
-const secretbox = require('../util/Secretbox');
 const { SILENCE_FRAME } = require('../util/Silence');
 
 // The delay between packets when a user is considered to have stopped speaking
@@ -58,7 +58,7 @@ class PacketHandler extends EventEmitter {
     }
 
     // Open packet
-    let packet = secretbox.methods.open(buffer.slice(12, end), this.nonce, secret_key);
+    let packet = sodium.methods.open(buffer.slice(12, end), this.nonce, secret_key);
     if (!packet) return new Error('Failed to decrypt voice packet');
     packet = Buffer.from(packet);
 
diff --git a/src/client/websocket/handlers/INTERACTION_CREATE.js b/src/client/websocket/handlers/INTERACTION_CREATE.js
new file mode 100644
index 00000000..5bf30fcc
--- /dev/null
+++ b/src/client/websocket/handlers/INTERACTION_CREATE.js
@@ -0,0 +1,5 @@
+'use strict';
+
+module.exports = (client, packet) => {
+  client.actions.InteractionCreate.handle(packet.d);
+};
diff --git a/src/index.js b/src/index.js
index d83e1bfa..e68fdbec 100644
--- a/src/index.js
+++ b/src/index.js
@@ -6,6 +6,7 @@ module.exports = {
   // "Root" classes (starting points)
   BaseClient: require('./client/BaseClient'),
   Client: require('./client/Client'),
+  InteractionClient: require('./client/InteractionClient'),
   Shard: require('./sharding/Shard'),
   ShardClientUtil: require('./sharding/ShardClientUtil'),
   ShardingManager: require('./sharding/ShardingManager'),
diff --git a/src/structures/APIMessage.js b/src/structures/APIMessage.js
index bd7cc610..c24c87ea 100644
--- a/src/structures/APIMessage.js
+++ b/src/structures/APIMessage.js
@@ -74,6 +74,16 @@ class APIMessage {
     return this.target instanceof Message;
   }
 
+  /**
+   * Whether or not the target is an interaction
+   * @type {boolean}
+   * @readonly
+   */
+  get isInteraction() {
+    const Interaction = require('./Interaction');
+    return this.target instanceof Interaction;
+  }
+
   /**
    * Makes the content of this message.
    * @returns {?(string|string[])}
@@ -166,6 +176,8 @@ class APIMessage {
     if (this.isMessage) {
       // eslint-disable-next-line eqeqeq
       flags = this.options.flags != null ? new MessageFlags(this.options.flags).bitfield : this.target.flags.bitfield;
+    } else if (this.isInteraction) {
+      flags = this.options.ephemeral ? MessageFlags.EPHEMERAL : undefined;
     }
 
     let allowedMentions =
diff --git a/src/structures/Interaction.js b/src/structures/Interaction.js
new file mode 100644
index 00000000..4c811c43
--- /dev/null
+++ b/src/structures/Interaction.js
@@ -0,0 +1,112 @@
+'use strict';
+
+const APIMessage = require('./APIMessage');
+const Base = require('./Base');
+const { InteractionResponseType } = require('../util/Constants');
+const Snowflake = require('../util/Snowflake');
+
+/**
+ * Represents an interaction, see {@link InteractionClient}.
+ * @extends {Base}
+ */
+class Interaction extends Base {
+  constructor(client, data) {
+    super(client);
+    this._patch(data);
+  }
+
+  _patch(data) {
+    /**
+     * The ID of this interaction.
+     * @type {Snowflake}
+     */
+    this.id = data.id;
+
+    /**
+     * The token of this interaction.
+     * @type {string}
+     */
+    this.token = data.token;
+
+    /**
+     * The ID of the invoked command.
+     * @type {Snowflake}
+     */
+    this.commandID = data.data.id;
+
+    /**
+     * The name of the invoked command.
+     * @type {string}
+     */
+    this.commandName = data.data.name;
+
+    /**
+     * The options passed to the command.
+     * @type {Object}
+     */
+    this.options = data.data.options;
+
+    /**
+     * The channel this interaction was sent in.
+     * @type {Channel}
+     */
+    this.channel = this.client.channels.cache.get(data.channel_id);
+
+    /**
+     * The guild this interaction was sent in, if any.
+     * @type {?Guild}
+     */
+    this.guild = data.guild_id ? this.client.guilds.cache.get(data.guild_id) : null;
+
+    /**
+     * If this interaction was sent in a guild, the member which sent it.
+     * @type {?Member}
+     */
+    this.member = data.member ? this.guild.members.add(data.member, false) : null;
+  }
+
+  /**
+   * The timestamp the emoji was created at, or null if unicode
+   * @type {?number}
+   * @readonly
+   */
+  get createdTimestamp() {
+    if (!this.id) return null;
+    return Snowflake.deconstruct(this.id).timestamp;
+  }
+
+  /**
+   * The time the emoji was created at, or null if unicode
+   * @type {?Date}
+   * @readonly
+   */
+  get createdAt() {
+    if (!this.id) return null;
+    return new Date(this.createdTimestamp);
+  }
+
+  async reply(content, options) {
+    let apiMessage;
+
+    if (content instanceof APIMessage) {
+      apiMessage = content.resolveData();
+    } else {
+      apiMessage = APIMessage.create(this, content, options).resolveData();
+      if (Array.isArray(apiMessage.data.content)) {
+        throw new Error();
+      }
+    }
+
+    const { data, files } = await apiMessage.resolveFiles();
+
+    return this.client.api.interactions(this.id, this.token).callback.post({
+      data: {
+        type: InteractionResponseType.CHANNEL_MESSAGE_WITH_SOURCE,
+        data,
+      },
+      files,
+    });
+  }
+}
+
+module.exports = Interaction;
diff --git a/src/util/Constants.js b/src/util/Constants.js
index 1d84a51e..0af65b3a 100644
--- a/src/util/Constants.js
+++ b/src/util/Constants.js
@@ -77,14 +77,14 @@ exports.DefaultOptions = {
   /**
    * HTTP options
    * @typedef {Object} HTTPOptions
-   * @property {number} [version=7] API version to use
+   * @property {number} [version=8] API version to use
    * @property {string} [api='https://discord.com/api'] Base url of the API
    * @property {string} [cdn='https://cdn.discordapp.com'] Base url of the CDN
    * @property {string} [invite='https://discord.gg'] Base url of invites
    * @property {string} [template='https://discord.new'] Base url of templates
    */
   http: {
-    version: 7,
+    version: 8,
     api: 'https://discord.com/api',
     cdn: 'https://cdn.discordapp.com',
     invite: 'https://discord.gg',
@@ -282,6 +282,7 @@ exports.Events = {
   SHARD_READY: 'shardReady',
   SHARD_RESUME: 'shardResume',
   INVALIDATED: 'invalidated',
+  INTERACTION_CREATE: 'interactionCreate',
   RAW: 'raw',
 };
 
@@ -345,6 +346,7 @@ exports.PartialTypes = keyMirror(['USER', 'CHANNEL', 'GUILD_MEMBER', 'MESSAGE',
  * * VOICE_STATE_UPDATE
  * * VOICE_SERVER_UPDATE
  * * WEBHOOKS_UPDATE
+ * * INTERACTION_CREATE
  * @typedef {string} WSEventType
  */
 exports.WSEvents = keyMirror([
@@ -384,6 +386,7 @@ exports.WSEvents = keyMirror([
   'VOICE_STATE_UPDATE',
   'VOICE_SERVER_UPDATE',
   'WEBHOOKS_UPDATE',
+  'INTERACTION_CREATE',
 ]);
 
 /**
@@ -676,6 +679,29 @@ exports.WebhookTypes = [
   'Channel Follower',
 ];
 
+exports.ApplicationCommandOptionType = {
+  SUB_COMMAND: 1,
+  SUB_COMMAND_GROUP: 2,
+  STRING: 3,
+  INTEGER: 4,
+  BOOLEAN: 5,
+  USER: 6,
+  CHANNEL: 7,
+  ROLE: 8,
+};
+
+exports.InteractionType = {
+  PING: 1,
+  APPLICATION_COMMAND: 2,
+};
+
+exports.InteractionResponseType = {
+  PONG: 1,
+  ACKNOWLEDGE: 2,
+  CHANNEL_MESSAGE: 3,
+  CHANNEL_MESSAGE_WITH_SOURCE: 4,
+};
+
 function keyMirror(arr) {
   let tmp = Object.create(null);
   for (const value of arr) tmp[value] = value;
diff --git a/src/util/MessageFlags.js b/src/util/MessageFlags.js
index 536cbd88..e693158e 100644
--- a/src/util/MessageFlags.js
+++ b/src/util/MessageFlags.js
@@ -22,6 +22,7 @@ class MessageFlags extends BitField {}
  * * `SUPPRESS_EMBEDS`
  * * `SOURCE_MESSAGE_DELETED`
  * * `URGENT`
+ * * `EPHEMERAL`
  * @type {Object}
  * @see {@link https://discord.com/developers/docs/resources/channel#message-object-message-flags}
  */
@@ -31,6 +32,7 @@ MessageFlags.FLAGS = {
   SUPPRESS_EMBEDS: 1 << 2,
   SOURCE_MESSAGE_DELETED: 1 << 3,
   URGENT: 1 << 4,
+  EPHEMERAL: 1 << 6,
 };
 
 module.exports = MessageFlags;
diff --git a/src/client/voice/util/Secretbox.js b/src/util/Sodium.js
similarity index 84%
rename from src/client/voice/util/Secretbox.js
rename to src/util/Sodium.js
index c16a4353..e19b5b9a 100644
--- a/src/client/voice/util/Secretbox.js
+++ b/src/util/Sodium.js
@@ -5,16 +5,19 @@ const libs = {
     open: sodium.api.crypto_secretbox_open_easy,
     close: sodium.api.crypto_secretbox_easy,
     random: n => sodium.randombytes_buf(n),
+    verify: sodium.api.crypto_sign_verify_detached,
   }),
   'libsodium-wrappers': sodium => ({
     open: sodium.crypto_secretbox_open_easy,
     close: sodium.crypto_secretbox_easy,
     random: n => sodium.randombytes_buf(n),
+    verify: sodium.crypto_sign_verify_detached,
   }),
   tweetnacl: tweetnacl => ({
     open: tweetnacl.secretbox.open,
     close: tweetnacl.secretbox,
     random: n => tweetnacl.randomBytes(n),
+    verify: (s, d, p) => tweetnacl.sign.detached.verify(d, s, p),
   }),
 };