diff --git a/assets/openapi.json b/assets/openapi.json
index d20ef2f..5a81a5d 100644
--- a/assets/openapi.json
+++ b/assets/openapi.json
@@ -4923,7 +4923,12 @@
                         "type": "integer"
                     },
                     "flags": {
-                        "type": "integer"
+                        "enum": [
+                            1,
+                            2,
+                            4
+                        ],
+                        "type": "number"
                     },
                     "last_viewed": {
                         "type": "integer"
@@ -4933,6 +4938,25 @@
                     }
                 }
             },
+            "AcknowledgeDeleteSchema": {
+                "type": "object",
+                "properties": {
+                    "read_state_type": {
+                        "enum": [
+                            0,
+                            1,
+                            2,
+                            3,
+                            4,
+                            5
+                        ],
+                        "type": "number"
+                    },
+                    "version": {
+                        "type": "integer"
+                    }
+                }
+            },
             "MessageCreateSchema": {
                 "type": "object",
                 "properties": {
@@ -12579,6 +12603,9 @@
             "name": "interactions"
         },
         {
+            "name": "invites"
+        },
+        {
             "name": "oauth2"
         },
         {
@@ -16164,6 +16191,163 @@
                 ]
             }
         },
+        "/invites/{invite_code}": {
+            "get": {
+                "responses": {
+                    "200": {
+                        "description": "",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "$ref": "#/components/schemas/Invite"
+                                }
+                            }
+                        }
+                    },
+                    "404": {
+                        "description": "",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "$ref": "#/components/schemas/APIErrorResponse"
+                                }
+                            }
+                        }
+                    }
+                },
+                "parameters": [
+                    {
+                        "name": "invite_code",
+                        "in": "path",
+                        "required": true,
+                        "schema": {
+                            "type": "string"
+                        },
+                        "description": "invite_code"
+                    }
+                ],
+                "tags": [
+                    "invites"
+                ]
+            },
+            "post": {
+                "x-right-required": "USE_MASS_INVITES",
+                "security": [
+                    {
+                        "bearer": []
+                    }
+                ],
+                "responses": {
+                    "200": {
+                        "description": "",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "$ref": "#/components/schemas/Invite"
+                                }
+                            }
+                        }
+                    },
+                    "401": {
+                        "description": "",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "$ref": "#/components/schemas/APIErrorResponse"
+                                }
+                            }
+                        }
+                    },
+                    "403": {
+                        "description": "",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "$ref": "#/components/schemas/APIErrorResponse"
+                                }
+                            }
+                        }
+                    },
+                    "404": {
+                        "description": "",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "$ref": "#/components/schemas/APIErrorResponse"
+                                }
+                            }
+                        }
+                    }
+                },
+                "parameters": [
+                    {
+                        "name": "invite_code",
+                        "in": "path",
+                        "required": true,
+                        "schema": {
+                            "type": "string"
+                        },
+                        "description": "invite_code"
+                    }
+                ],
+                "tags": [
+                    "invites"
+                ]
+            },
+            "delete": {
+                "security": [
+                    {
+                        "bearer": []
+                    }
+                ],
+                "responses": {
+                    "200": {
+                        "description": "",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "$ref": "#/components/schemas/Invite"
+                                }
+                            }
+                        }
+                    },
+                    "401": {
+                        "description": "",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "$ref": "#/components/schemas/APIErrorResponse"
+                                }
+                            }
+                        }
+                    },
+                    "404": {
+                        "description": "",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "$ref": "#/components/schemas/APIErrorResponse"
+                                }
+                            }
+                        }
+                    }
+                },
+                "parameters": [
+                    {
+                        "name": "invite_code",
+                        "in": "path",
+                        "required": true,
+                        "schema": {
+                            "type": "string"
+                        },
+                        "description": "invite_code"
+                    }
+                ],
+                "tags": [
+                    "invites"
+                ]
+            }
+        },
         "/interactions/": {
             "post": {
                 "security": [
@@ -21699,6 +21883,44 @@
                 ]
             }
         },
+        "/channels/{channel_id}/messages/ack": {
+            "delete": {
+                "security": [
+                    {
+                        "bearer": []
+                    }
+                ],
+                "requestBody": {
+                    "required": true,
+                    "content": {
+                        "application/json": {
+                            "schema": {
+                                "$ref": "#/components/schemas/AcknowledgeDeleteSchema"
+                            }
+                        }
+                    }
+                },
+                "responses": {
+                    "204": {
+                        "description": "No description available"
+                    }
+                },
+                "parameters": [
+                    {
+                        "name": "channel_id",
+                        "in": "path",
+                        "required": true,
+                        "schema": {
+                            "type": "string"
+                        },
+                        "description": "channel_id"
+                    }
+                ],
+                "tags": [
+                    "channels"
+                ]
+            }
+        },
         "/channels/{channel_id}/messages/bulk-delete/": {
             "post": {
                 "security": [
diff --git a/assets/schemas.json b/assets/schemas.json
index bfe3de6..e092a91 100644
--- a/assets/schemas.json
+++ b/assets/schemas.json
@@ -5243,7 +5243,12 @@
                 "type": "integer"
             },
             "flags": {
-                "type": "integer"
+                "enum": [
+                    1,
+                    2,
+                    4
+                ],
+                "type": "number"
             },
             "last_viewed": {
                 "type": "integer"
@@ -5255,6 +5260,27 @@
         "additionalProperties": false,
         "$schema": "http://json-schema.org/draft-07/schema#"
     },
+    "AcknowledgeDeleteSchema": {
+        "type": "object",
+        "properties": {
+            "read_state_type": {
+                "enum": [
+                    0,
+                    1,
+                    2,
+                    3,
+                    4,
+                    5
+                ],
+                "type": "number"
+            },
+            "version": {
+                "type": "integer"
+            }
+        },
+        "additionalProperties": false,
+        "$schema": "http://json-schema.org/draft-07/schema#"
+    },
     "MessageCreateSchema": {
         "type": "object",
         "properties": {
diff --git "a/src/api/routes/channels/\043channel_id/messages/index.ts" "b/src/api/routes/channels/\043channel_id/messages/index.ts"
index d399e53..8790241 100644
--- "a/src/api/routes/channels/\043channel_id/messages/index.ts"
+++ "b/src/api/routes/channels/\043channel_id/messages/index.ts"
@@ -18,7 +18,6 @@
 
 import { handleMessage, postHandleMessage, route } from "@spacebar/api";
 import {
-	ApiError,
 	Attachment,
 	AutomodRule,
 	AutomodTriggerTypes,
@@ -39,9 +38,9 @@
 	Relationship,
 	Rights,
 	Snowflake,
+	stringGlobToRegexp,
 	uploadFile,
 	User,
-	stringGlobToRegexp,
 } from "@spacebar/util";
 import { Request, Response, Router } from "express";
 import { HTTPError } from "lambert-server";
@@ -49,6 +48,7 @@
 import { FindManyOptions, FindOperator, LessThan, MoreThan, MoreThanOrEqual } from "typeorm";
 import { URL } from "url";
 import {
+	AcknowledgeDeleteSchema,
 	AutomodCustomWordsRule,
 	AutomodRuleActionType,
 	AutomodRuleEventType,
@@ -57,6 +57,7 @@
 	MessageCreateCloudAttachment,
 	MessageCreateSchema,
 	Reaction,
+	ReadStateType,
 	RelationshipType,
 } from "@spacebar/schemas";
 
@@ -532,4 +533,28 @@
 	},
 );
 
+router.delete(
+	"/ack",
+	route({
+		requestBody: "AcknowledgeDeleteSchema",
+		responses: {
+			204: {},
+		},
+	}),
+	async (req: Request, res: Response) => {
+		const { channel_id } = req.params; // not really a channel id if read_state_type != CHANNEL
+		const body = req.body as AcknowledgeDeleteSchema;
+		if (body.version != 2) return res.status(204).send();
+		// TODO: handle other read state types
+		if (body.read_state_type != ReadStateType.CHANNEL) return res.status(204).send();
+
+		const readState = await ReadState.findOne({where: {channel_id}});
+		if (readState) {
+			await readState.remove();
+		}
+
+		res.status(204).send();
+	},
+);
+
 export default router;
diff --git a/src/schemas/uncategorised/MessageAcknowledgeSchema.ts b/src/schemas/uncategorised/MessageAcknowledgeSchema.ts
index 3ba7164..891ccc9 100644
--- a/src/schemas/uncategorised/MessageAcknowledgeSchema.ts
+++ b/src/schemas/uncategorised/MessageAcknowledgeSchema.ts
@@ -19,7 +19,27 @@
 export interface MessageAcknowledgeSchema {
 	manual?: boolean;
 	mention_count?: number;
-	flags?: number;
+	flags?: ReadStateFlags;
 	last_viewed?: number;
 	token?: string;
 }
+
+export interface AcknowledgeDeleteSchema {
+	read_state_type?: ReadStateType;
+	version?: number;
+}
+
+export enum ReadStateType {
+	CHANNEL = 0,
+	GUILD_EVENT = 1,
+	NOTIFICATION_CENTER = 2,
+	GUILD_HOME = 3,
+	GUILD_ONBOARDING_QUESTION = 4,
+	MESSAGE_REQUESTS = 5,
+}
+
+export enum ReadStateFlags {
+	IS_GUILD_CHANNEL = 1 << 0,
+	IS_THREAD = 1 << 1,
+	IS_MENTION_LOW_IMPORTANCE = 1 << 2,
+}
\ No newline at end of file