diff --git a/lexicons/chat/sprk/actor/declaration.json b/lexicons/chat/sprk/actor/declaration.json
new file mode 100644
index 0000000..a507aac
--- /dev/null
+++ b/lexicons/chat/sprk/actor/declaration.json
@@ -0,0 +1,21 @@
+{
+  "lexicon": 1,
+  "id": "chat.sprk.actor.declaration",
+  "defs": {
+    "main": {
+      "type": "record",
+      "description": "A declaration of a Spark chat account.",
+      "key": "literal:self",
+      "record": {
+        "type": "object",
+        "required": ["allowIncoming"],
+        "properties": {
+          "allowIncoming": {
+            "type": "string",
+            "knownValues": ["all", "none", "following"]
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/lexicons/chat/sprk/actor/defs.json b/lexicons/chat/sprk/actor/defs.json
new file mode 100644
index 0000000..ee456ff
--- /dev/null
+++ b/lexicons/chat/sprk/actor/defs.json
@@ -0,0 +1,38 @@
+{
+  "lexicon": 1,
+  "id": "chat.sprk.actor.defs",
+  "defs": {
+    "profileViewBasic": {
+      "type": "object",
+      "required": ["did", "handle"],
+      "properties": {
+        "did": { "type": "string", "format": "did" },
+        "handle": { "type": "string", "format": "handle" },
+        "displayName": {
+          "type": "string",
+          "maxGraphemes": 64,
+          "maxLength": 640
+        },
+        "avatar": { "type": "string", "format": "uri" },
+        "associated": {
+          "type": "ref",
+          "ref": "so.sprk.actor.defs#profileAssociated"
+        },
+        "viewer": { "type": "ref", "ref": "so.sprk.actor.defs#viewerState" },
+        "labels": {
+          "type": "array",
+          "items": { "type": "ref", "ref": "com.atproto.label.defs#label" }
+        },
+        "createdAt": { "type": "string", "format": "datetime" },
+        "stories": {
+          "type": "array",
+          "description": "Recent stories from this profile author.",
+          "items": {
+            "type": "ref",
+            "ref": "com.atproto.repo.strongRef"
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/lexicons/chat/sprk/authFull.json b/lexicons/chat/sprk/authFull.json
new file mode 100644
index 0000000..465bcd2
--- /dev/null
+++ b/lexicons/chat/sprk/authFull.json
@@ -0,0 +1,46 @@
+{
+  "lexicon": 1,
+  "id": "chat.sprk.authFull",
+  "defs": {
+    "main": {
+      "type": "permission-set",
+      "title": "Full Spark Chat Permissions",
+      "title:lang": {},
+      "detail": "Control of all Spark chat conversations and configuration management.",
+      "detail:lang": {
+        "en": "All Spark Chat Conversations"
+      },
+      "permissions": [
+        {
+          "type": "permission",
+          "resource": "rpc",
+          "inheritAud": true,
+          "lxm": [
+            "chat.sprk.convo.acceptConvo",
+            "chat.sprk.convo.addReaction",
+            "chat.sprk.convo.getConvo",
+            "chat.sprk.convo.getConvoAvailability",
+            "chat.sprk.convo.getConvoForMembers",
+            "chat.sprk.convo.getLog",
+            "chat.sprk.convo.getMessages",
+            "chat.sprk.convo.leaveConvo",
+            "chat.sprk.convo.listConvos",
+            "chat.sprk.convo.muteConvo",
+            "chat.sprk.convo.removeReaction",
+            "chat.sprk.convo.sendMessage",
+            "chat.sprk.convo.sendMessageBatch",
+            "chat.sprk.convo.unmuteConvo",
+            "chat.sprk.convo.updateAllRead",
+            "chat.sprk.convo.updateRead"
+          ]
+        },
+        {
+          "type": "permission",
+          "resource": "repo",
+          "action": ["create", "update", "delete"],
+          "collection": ["chat.sprk.actor.declaration"]
+        }
+      ]
+    }
+  }
+}
diff --git a/lexicons/chat/sprk/convo/acceptConvo.json b/lexicons/chat/sprk/convo/acceptConvo.json
new file mode 100644
index 0000000..112d08c
--- /dev/null
+++ b/lexicons/chat/sprk/convo/acceptConvo.json
@@ -0,0 +1,31 @@
+{
+  "lexicon": 1,
+  "id": "chat.sprk.convo.acceptConvo",
+  "defs": {
+    "main": {
+      "type": "procedure",
+      "input": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["convoId"],
+          "properties": {
+            "convoId": { "type": "string" }
+          }
+        }
+      },
+      "output": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "properties": {
+            "rev": {
+              "description": "Rev when the convo was accepted. If not present, the convo was already accepted.",
+              "type": "string"
+            }
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/lexicons/chat/sprk/convo/addReaction.json b/lexicons/chat/sprk/convo/addReaction.json
new file mode 100644
index 0000000..4ec996d
--- /dev/null
+++ b/lexicons/chat/sprk/convo/addReaction.json
@@ -0,0 +1,55 @@
+{
+  "lexicon": 1,
+  "id": "chat.sprk.convo.addReaction",
+  "defs": {
+    "main": {
+      "type": "procedure",
+      "description": "Adds an emoji reaction to a message. Requires authentication. It is idempotent, so multiple calls from the same user with the same emoji result in a single reaction.",
+      "input": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["convoId", "messageId", "value"],
+          "properties": {
+            "convoId": { "type": "string" },
+            "messageId": { "type": "string" },
+            "value": {
+              "type": "string",
+              "minLength": 1,
+              "maxLength": 64,
+              "minGraphemes": 1,
+              "maxGraphemes": 1
+            }
+          }
+        }
+      },
+      "output": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["message"],
+          "properties": {
+            "message": {
+              "type": "ref",
+              "ref": "chat.sprk.convo.defs#messageView"
+            }
+          }
+        }
+      },
+      "errors": [
+        {
+          "name": "ReactionMessageDeleted",
+          "description": "Indicates that the message has been deleted and reactions can no longer be added/removed."
+        },
+        {
+          "name": "ReactionLimitReached",
+          "description": "Indicates that the message has the maximum number of reactions allowed for a single user, and the requested reaction wasn't yet present. If it was already present, the request will not fail since it is idempotent."
+        },
+        {
+          "name": "ReactionInvalidValue",
+          "description": "Indicates the value for the reaction is not acceptable. In general, this means it is not an emoji."
+        }
+      ]
+    }
+  }
+}
diff --git a/lexicons/chat/sprk/convo/defs.json b/lexicons/chat/sprk/convo/defs.json
new file mode 100644
index 0000000..7d7cecf
--- /dev/null
+++ b/lexicons/chat/sprk/convo/defs.json
@@ -0,0 +1,226 @@
+{
+  "lexicon": 1,
+  "id": "chat.sprk.convo.defs",
+  "defs": {
+    "messageRef": {
+      "type": "object",
+      "required": ["did", "messageId", "convoId"],
+      "properties": {
+        "did": { "type": "string", "format": "did" },
+        "convoId": { "type": "string" },
+        "messageId": { "type": "string" }
+      }
+    },
+    "messageInput": {
+      "type": "object",
+      "required": ["text"],
+      "properties": {
+        "text": {
+          "type": "string",
+          "maxLength": 10000,
+          "maxGraphemes": 1000
+        },
+        "embed": {
+          "type": "string",
+          "format": "at-uri"
+        }
+      }
+    },
+    "messageView": {
+      "type": "object",
+      "required": ["id", "rev", "text", "sender", "sentAt"],
+      "properties": {
+        "id": { "type": "string" },
+        "rev": { "type": "string" },
+        "text": {
+          "type": "string",
+          "maxLength": 10000,
+          "maxGraphemes": 1000
+        },
+        "embed": {
+          "type": "string",
+          "format": "at-uri"
+        },
+        "reactions": {
+          "type": "array",
+          "description": "Reactions to this message, in ascending order of creation time.",
+          "items": { "type": "ref", "ref": "#reactionView" }
+        },
+        "sender": { "type": "ref", "ref": "#messageViewSender" },
+        "sentAt": { "type": "string", "format": "datetime" }
+      }
+    },
+    "deletedMessageView": {
+      "type": "object",
+      "required": ["id", "rev", "sender", "sentAt"],
+      "properties": {
+        "id": { "type": "string" },
+        "rev": { "type": "string" },
+        "sender": { "type": "ref", "ref": "#messageViewSender" },
+        "sentAt": { "type": "string", "format": "datetime" }
+      }
+    },
+    "messageViewSender": {
+      "type": "object",
+      "required": ["did"],
+      "properties": {
+        "did": { "type": "string", "format": "did" }
+      }
+    },
+    "reactionView": {
+      "type": "object",
+      "required": ["value", "sender", "createdAt"],
+      "properties": {
+        "value": { "type": "string" },
+        "sender": { "type": "ref", "ref": "#reactionViewSender" },
+        "createdAt": { "type": "string", "format": "datetime" }
+      }
+    },
+    "reactionViewSender": {
+      "type": "object",
+      "required": ["did"],
+      "properties": {
+        "did": { "type": "string", "format": "did" }
+      }
+    },
+    "messageAndReactionView": {
+      "type": "object",
+      "required": ["message", "reaction"],
+      "properties": {
+        "message": { "type": "ref", "ref": "#messageView" },
+        "reaction": { "type": "ref", "ref": "#reactionView" }
+      }
+    },
+    "convoView": {
+      "type": "object",
+      "required": ["id", "rev", "members", "muted", "unreadCount"],
+      "properties": {
+        "id": { "type": "string" },
+        "rev": { "type": "string" },
+        "members": {
+          "type": "array",
+          "items": {
+            "type": "ref",
+            "ref": "chat.sprk.actor.defs#profileViewBasic"
+          }
+        },
+        "lastMessage": {
+          "type": "union",
+          "refs": ["#messageView", "#deletedMessageView"]
+        },
+        "lastReaction": {
+          "type": "union",
+          "refs": ["#messageAndReactionView"]
+        },
+        "muted": { "type": "boolean" },
+        "status": {
+          "type": "string",
+          "knownValues": ["request", "accepted"]
+        },
+        "unreadCount": { "type": "integer" }
+      }
+    },
+    "logBeginConvo": {
+      "type": "object",
+      "required": ["rev", "convoId"],
+      "properties": {
+        "rev": { "type": "string" },
+        "convoId": { "type": "string" }
+      }
+    },
+    "logAcceptConvo": {
+      "type": "object",
+      "required": ["rev", "convoId"],
+      "properties": {
+        "rev": { "type": "string" },
+        "convoId": { "type": "string" }
+      }
+    },
+    "logLeaveConvo": {
+      "type": "object",
+      "required": ["rev", "convoId"],
+      "properties": {
+        "rev": { "type": "string" },
+        "convoId": { "type": "string" }
+      }
+    },
+    "logMuteConvo": {
+      "type": "object",
+      "required": ["rev", "convoId"],
+      "properties": {
+        "rev": { "type": "string" },
+        "convoId": { "type": "string" }
+      }
+    },
+    "logUnmuteConvo": {
+      "type": "object",
+      "required": ["rev", "convoId"],
+      "properties": {
+        "rev": { "type": "string" },
+        "convoId": { "type": "string" }
+      }
+    },
+    "logCreateMessage": {
+      "type": "object",
+      "required": ["rev", "convoId", "message"],
+      "properties": {
+        "rev": { "type": "string" },
+        "convoId": { "type": "string" },
+        "message": {
+          "type": "union",
+          "refs": ["#messageView", "#deletedMessageView"]
+        }
+      }
+    },
+    "logDeleteMessage": {
+      "type": "object",
+      "required": ["rev", "convoId", "message"],
+      "properties": {
+        "rev": { "type": "string" },
+        "convoId": { "type": "string" },
+        "message": {
+          "type": "union",
+          "refs": ["#messageView", "#deletedMessageView"]
+        }
+      }
+    },
+    "logReadMessage": {
+      "type": "object",
+      "required": ["rev", "convoId", "message"],
+      "properties": {
+        "rev": { "type": "string" },
+        "convoId": { "type": "string" },
+        "message": {
+          "type": "union",
+          "refs": ["#messageView", "#deletedMessageView"]
+        }
+      }
+    },
+    "logAddReaction": {
+      "type": "object",
+      "required": ["rev", "convoId", "message", "reaction"],
+      "properties": {
+        "rev": { "type": "string" },
+        "convoId": { "type": "string" },
+        "message": {
+          "type": "union",
+          "refs": ["#messageView", "#deletedMessageView"]
+        },
+        "reaction": { "type": "ref", "ref": "#reactionView" }
+      }
+    },
+    "logRemoveReaction": {
+      "type": "object",
+      "required": ["rev", "convoId", "message", "reaction"],
+      "properties": {
+        "rev": { "type": "string" },
+        "convoId": { "type": "string" },
+        "message": {
+          "type": "union",
+          "refs": ["#messageView", "#deletedMessageView"]
+        },
+        "reaction": { "type": "ref", "ref": "#reactionView" }
+      }
+    }
+  }
+}
diff --git a/lexicons/chat/sprk/convo/getConvo.json b/lexicons/chat/sprk/convo/getConvo.json
new file mode 100644
index 0000000..c29f6ea
--- /dev/null
+++ b/lexicons/chat/sprk/convo/getConvo.json
@@ -0,0 +1,29 @@
+{
+  "lexicon": 1,
+  "id": "chat.sprk.convo.getConvo",
+  "defs": {
+    "main": {
+      "type": "query",
+      "parameters": {
+        "type": "params",
+        "required": ["convoId"],
+        "properties": {
+          "convoId": { "type": "string" }
+        }
+      },
+      "output": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["convo"],
+          "properties": {
+            "convo": {
+              "type": "ref",
+              "ref": "chat.sprk.convo.defs#convoView"
+            }
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/lexicons/chat/sprk/convo/getConvoAvailability.json b/lexicons/chat/sprk/convo/getConvoAvailability.json
new file mode 100644
index 0000000..fcef965
--- /dev/null
+++ b/lexicons/chat/sprk/convo/getConvoAvailability.json
@@ -0,0 +1,41 @@
+{
+  "lexicon": 1,
+  "id": "chat.sprk.convo.getConvoAvailability",
+  "defs": {
+    "main": {
+      "type": "query",
+      "description": "Get whether the requester and the other members can chat. If an existing convo is found for these members, it is returned.",
+      "parameters": {
+        "type": "params",
+        "required": ["members"],
+        "properties": {
+          "members": {
+            "type": "array",
+            "minLength": 1,
+            "maxLength": 10,
+            "items": {
+              "type": "string",
+              "format": "did"
+            }
+          }
+        }
+      },
+      "output": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["canChat"],
+          "properties": {
+            "canChat": {
+              "type": "boolean"
+            },
+            "convo": {
+              "type": "ref",
+              "ref": "chat.sprk.convo.defs#convoView"
+            }
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/lexicons/chat/sprk/convo/getConvoForMembers.json b/lexicons/chat/sprk/convo/getConvoForMembers.json
new file mode 100644
index 0000000..cdc9945
--- /dev/null
+++ b/lexicons/chat/sprk/convo/getConvoForMembers.json
@@ -0,0 +1,37 @@
+{
+  "lexicon": 1,
+  "id": "chat.sprk.convo.getConvoForMembers",
+  "defs": {
+    "main": {
+      "type": "query",
+      "parameters": {
+        "type": "params",
+        "required": ["members"],
+        "properties": {
+          "members": {
+            "type": "array",
+            "minLength": 1,
+            "maxLength": 10,
+            "items": {
+              "type": "string",
+              "format": "did"
+            }
+          }
+        }
+      },
+      "output": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["convo"],
+          "properties": {
+            "convo": {
+              "type": "ref",
+              "ref": "chat.sprk.convo.defs#convoView"
+            }
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/lexicons/chat/sprk/convo/getLog.json b/lexicons/chat/sprk/convo/getLog.json
new file mode 100644
index 0000000..a7df182
--- /dev/null
+++ b/lexicons/chat/sprk/convo/getLog.json
@@ -0,0 +1,44 @@
+{
+  "lexicon": 1,
+  "id": "chat.sprk.convo.getLog",
+  "defs": {
+    "main": {
+      "type": "query",
+      "parameters": {
+        "type": "params",
+        "required": [],
+        "properties": {
+          "cursor": { "type": "string" }
+        }
+      },
+      "output": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["logs"],
+          "properties": {
+            "cursor": { "type": "string" },
+            "logs": {
+              "type": "array",
+              "items": {
+                "type": "union",
+                "refs": [
+                  "chat.sprk.convo.defs#logBeginConvo",
+                  "chat.sprk.convo.defs#logAcceptConvo",
+                  "chat.sprk.convo.defs#logLeaveConvo",
+                  "chat.sprk.convo.defs#logMuteConvo",
+                  "chat.sprk.convo.defs#logUnmuteConvo",
+                  "chat.sprk.convo.defs#logCreateMessage",
+                  "chat.sprk.convo.defs#logDeleteMessage",
+                  "chat.sprk.convo.defs#logReadMessage",
+                  "chat.sprk.convo.defs#logAddReaction",
+                  "chat.sprk.convo.defs#logRemoveReaction"
+                ]
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/lexicons/chat/sprk/convo/getMessages.json b/lexicons/chat/sprk/convo/getMessages.json
new file mode 100644
index 0000000..9f4c8c4
--- /dev/null
+++ b/lexicons/chat/sprk/convo/getMessages.json
@@ -0,0 +1,43 @@
+{
+  "lexicon": 1,
+  "id": "chat.sprk.convo.getMessages",
+  "defs": {
+    "main": {
+      "type": "query",
+      "parameters": {
+        "type": "params",
+        "required": ["convoId"],
+        "properties": {
+          "convoId": { "type": "string" },
+          "limit": {
+            "type": "integer",
+            "minimum": 1,
+            "maximum": 100,
+            "default": 50
+          },
+          "cursor": { "type": "string" }
+        }
+      },
+      "output": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["messages"],
+          "properties": {
+            "cursor": { "type": "string" },
+            "messages": {
+              "type": "array",
+              "items": {
+                "type": "union",
+                "refs": [
+                  "chat.sprk.convo.defs#messageView",
+                  "chat.sprk.convo.defs#deletedMessageView"
+                ]
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/lexicons/chat/sprk/convo/leaveConvo.json b/lexicons/chat/sprk/convo/leaveConvo.json
new file mode 100644
index 0000000..8967333
--- /dev/null
+++ b/lexicons/chat/sprk/convo/leaveConvo.json
@@ -0,0 +1,30 @@
+{
+  "lexicon": 1,
+  "id": "chat.sprk.convo.leaveConvo",
+  "defs": {
+    "main": {
+      "type": "procedure",
+      "input": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["convoId"],
+          "properties": {
+            "convoId": { "type": "string" }
+          }
+        }
+      },
+      "output": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["convoId", "rev"],
+          "properties": {
+            "convoId": { "type": "string" },
+            "rev": { "type": "string" }
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/lexicons/chat/sprk/convo/listConvos.json b/lexicons/chat/sprk/convo/listConvos.json
new file mode 100644
index 0000000..d57d369
--- /dev/null
+++ b/lexicons/chat/sprk/convo/listConvos.json
@@ -0,0 +1,46 @@
+{
+  "lexicon": 1,
+  "id": "chat.sprk.convo.listConvos",
+  "defs": {
+    "main": {
+      "type": "query",
+      "parameters": {
+        "type": "params",
+        "properties": {
+          "limit": {
+            "type": "integer",
+            "minimum": 1,
+            "maximum": 100,
+            "default": 50
+          },
+          "cursor": { "type": "string" },
+          "readState": {
+            "type": "string",
+            "knownValues": ["unread"]
+          },
+          "status": {
+            "type": "string",
+            "knownValues": ["request", "accepted"]
+          }
+        }
+      },
+      "output": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["convos"],
+          "properties": {
+            "cursor": { "type": "string" },
+            "convos": {
+              "type": "array",
+              "items": {
+                "type": "ref",
+                "ref": "chat.sprk.convo.defs#convoView"
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/lexicons/chat/sprk/convo/muteConvo.json b/lexicons/chat/sprk/convo/muteConvo.json
new file mode 100644
index 0000000..75edd6a
--- /dev/null
+++ b/lexicons/chat/sprk/convo/muteConvo.json
@@ -0,0 +1,32 @@
+{
+  "lexicon": 1,
+  "id": "chat.sprk.convo.muteConvo",
+  "defs": {
+    "main": {
+      "type": "procedure",
+      "input": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["convoId"],
+          "properties": {
+            "convoId": { "type": "string" }
+          }
+        }
+      },
+      "output": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["convo"],
+          "properties": {
+            "convo": {
+              "type": "ref",
+              "ref": "chat.sprk.convo.defs#convoView"
+            }
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/lexicons/chat/sprk/convo/removeReaction.json b/lexicons/chat/sprk/convo/removeReaction.json
new file mode 100644
index 0000000..a2b67d1
--- /dev/null
+++ b/lexicons/chat/sprk/convo/removeReaction.json
@@ -0,0 +1,51 @@
+{
+  "lexicon": 1,
+  "id": "chat.sprk.convo.removeReaction",
+  "defs": {
+    "main": {
+      "type": "procedure",
+      "description": "Removes an emoji reaction from a message. Requires authentication. It is idempotent, so multiple calls from the same user with the same emoji result in that reaction not being present, even if it already wasn't.",
+      "input": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["convoId", "messageId", "value"],
+          "properties": {
+            "convoId": { "type": "string" },
+            "messageId": { "type": "string" },
+            "value": {
+              "type": "string",
+              "minLength": 1,
+              "maxLength": 64,
+              "minGraphemes": 1,
+              "maxGraphemes": 1
+            }
+          }
+        }
+      },
+      "output": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["message"],
+          "properties": {
+            "message": {
+              "type": "ref",
+              "ref": "chat.sprk.convo.defs#messageView"
+            }
+          }
+        }
+      },
+      "errors": [
+        {
+          "name": "ReactionMessageDeleted",
+          "description": "Indicates that the message has been deleted and reactions can no longer be added/removed."
+        },
+        {
+          "name": "ReactionInvalidValue",
+          "description": "Indicates the value for the reaction is not acceptable. In general, this means it is not an emoji."
+        }
+      ]
+    }
+  }
+}
diff --git a/lexicons/chat/sprk/convo/sendMessage.json b/lexicons/chat/sprk/convo/sendMessage.json
new file mode 100644
index 0000000..3745af9
--- /dev/null
+++ b/lexicons/chat/sprk/convo/sendMessage.json
@@ -0,0 +1,30 @@
+{
+  "lexicon": 1,
+  "id": "chat.sprk.convo.sendMessage",
+  "defs": {
+    "main": {
+      "type": "procedure",
+      "input": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["convoId", "message"],
+          "properties": {
+            "convoId": { "type": "string" },
+            "message": {
+              "type": "ref",
+              "ref": "chat.sprk.convo.defs#messageInput"
+            }
+          }
+        }
+      },
+      "output": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "ref",
+          "ref": "chat.sprk.convo.defs#messageView"
+        }
+      }
+    }
+  }
+}
diff --git a/lexicons/chat/sprk/convo/sendMessageBatch.json b/lexicons/chat/sprk/convo/sendMessageBatch.json
new file mode 100644
index 0000000..196bf6f
--- /dev/null
+++ b/lexicons/chat/sprk/convo/sendMessageBatch.json
@@ -0,0 +1,53 @@
+{
+  "lexicon": 1,
+  "id": "chat.sprk.convo.sendMessageBatch",
+  "defs": {
+    "main": {
+      "type": "procedure",
+      "input": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["items"],
+          "properties": {
+            "items": {
+              "type": "array",
+              "maxLength": 100,
+              "items": {
+                "type": "ref",
+                "ref": "#batchItem"
+              }
+            }
+          }
+        }
+      },
+      "output": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["items"],
+          "properties": {
+            "items": {
+              "type": "array",
+              "items": {
+                "type": "ref",
+                "ref": "chat.sprk.convo.defs#messageView"
+              }
+            }
+          }
+        }
+      }
+    },
+    "batchItem": {
+      "type": "object",
+      "required": ["convoId", "message"],
+      "properties": {
+        "convoId": { "type": "string" },
+        "message": {
+          "type": "ref",
+          "ref": "chat.sprk.convo.defs#messageInput"
+        }
+      }
+    }
+  }
+}
diff --git a/lexicons/chat/sprk/convo/unmuteConvo.json b/lexicons/chat/sprk/convo/unmuteConvo.json
new file mode 100644
index 0000000..7eb82f9
--- /dev/null
+++ b/lexicons/chat/sprk/convo/unmuteConvo.json
@@ -0,0 +1,32 @@
+{
+  "lexicon": 1,
+  "id": "chat.sprk.convo.unmuteConvo",
+  "defs": {
+    "main": {
+      "type": "procedure",
+      "input": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["convoId"],
+          "properties": {
+            "convoId": { "type": "string" }
+          }
+        }
+      },
+      "output": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["convo"],
+          "properties": {
+            "convo": {
+              "type": "ref",
+              "ref": "chat.sprk.convo.defs#convoView"
+            }
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/lexicons/chat/sprk/convo/updateAllRead.json b/lexicons/chat/sprk/convo/updateAllRead.json
new file mode 100644
index 0000000..7f808b3
--- /dev/null
+++ b/lexicons/chat/sprk/convo/updateAllRead.json
@@ -0,0 +1,34 @@
+{
+  "lexicon": 1,
+  "id": "chat.sprk.convo.updateAllRead",
+  "defs": {
+    "main": {
+      "type": "procedure",
+      "input": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "properties": {
+            "status": {
+              "type": "string",
+              "knownValues": ["request", "accepted"]
+            }
+          }
+        }
+      },
+      "output": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["updatedCount"],
+          "properties": {
+            "updatedCount": {
+              "description": "The count of updated convos.",
+              "type": "integer"
+            }
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/lexicons/chat/sprk/convo/updateRead.json b/lexicons/chat/sprk/convo/updateRead.json
new file mode 100644
index 0000000..c5f0c7b
--- /dev/null
+++ b/lexicons/chat/sprk/convo/updateRead.json
@@ -0,0 +1,33 @@
+{
+  "lexicon": 1,
+  "id": "chat.sprk.convo.updateRead",
+  "defs": {
+    "main": {
+      "type": "procedure",
+      "input": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["convoId"],
+          "properties": {
+            "convoId": { "type": "string" },
+            "messageId": { "type": "string" }
+          }
+        }
+      },
+      "output": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["convo"],
+          "properties": {
+            "convo": {
+              "type": "ref",
+              "ref": "chat.sprk.convo.defs#convoView"
+            }
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/lexicons/chat/sprk/moderation/getActorMetadata.json b/lexicons/chat/sprk/moderation/getActorMetadata.json
new file mode 100644
index 0000000..68756d9
--- /dev/null
+++ b/lexicons/chat/sprk/moderation/getActorMetadata.json
@@ -0,0 +1,43 @@
+{
+  "lexicon": 1,
+  "id": "chat.sprk.moderation.getActorMetadata",
+  "defs": {
+    "main": {
+      "type": "query",
+      "parameters": {
+        "type": "params",
+        "required": ["actor"],
+        "properties": {
+          "actor": { "type": "string", "format": "did" }
+        }
+      },
+      "output": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["day", "month", "all"],
+          "properties": {
+            "day": { "type": "ref", "ref": "#metadata" },
+            "month": { "type": "ref", "ref": "#metadata" },
+            "all": { "type": "ref", "ref": "#metadata" }
+          }
+        }
+      }
+    },
+    "metadata": {
+      "type": "object",
+      "required": [
+        "messagesSent",
+        "messagesReceived",
+        "convos",
+        "convosStarted"
+      ],
+      "properties": {
+        "messagesSent": { "type": "integer" },
+        "messagesReceived": { "type": "integer" },
+        "convos": { "type": "integer" },
+        "convosStarted": { "type": "integer" }
+      }
+    }
+  }
+}
diff --git a/lexicons/chat/sprk/moderation/getMessageContext.json b/lexicons/chat/sprk/moderation/getMessageContext.json
new file mode 100644
index 0000000..c3d7c25
--- /dev/null
+++ b/lexicons/chat/sprk/moderation/getMessageContext.json
@@ -0,0 +1,41 @@
+{
+  "lexicon": 1,
+  "id": "chat.sprk.moderation.getMessageContext",
+  "defs": {
+    "main": {
+      "type": "query",
+      "parameters": {
+        "type": "params",
+        "required": ["messageId"],
+        "properties": {
+          "convoId": {
+            "type": "string",
+            "description": "Conversation that the message is from. NOTE: this field will eventually be required."
+          },
+          "messageId": { "type": "string" },
+          "before": { "type": "integer", "default": 5 },
+          "after": { "type": "integer", "default": 5 }
+        }
+      },
+      "output": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["messages"],
+          "properties": {
+            "messages": {
+              "type": "array",
+              "items": {
+                "type": "union",
+                "refs": [
+                  "chat.sprk.convo.defs#messageView",
+                  "chat.sprk.convo.defs#deletedMessageView"
+                ]
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/lexicons/chat/sprk/moderation/updateActorAccess.json b/lexicons/chat/sprk/moderation/updateActorAccess.json
new file mode 100644
index 0000000..03abfa7
--- /dev/null
+++ b/lexicons/chat/sprk/moderation/updateActorAccess.json
@@ -0,0 +1,21 @@
+{
+  "lexicon": 1,
+  "id": "chat.sprk.moderation.updateActorAccess",
+  "defs": {
+    "main": {
+      "type": "procedure",
+      "input": {
+        "encoding": "application/json",
+        "schema": {
+          "type": "object",
+          "required": ["actor", "allowAccess"],
+          "properties": {
+            "actor": { "type": "string", "format": "did" },
+            "allowAccess": { "type": "boolean" },
+            "ref": { "type": "string" }
+          }
+        }
+      }
+    }
+  }
+}