diff --git a/Cargo.lock b/Cargo.lock
index c8d56884..c82646a8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1632,6 +1632,16 @@ dependencies = [
  "litrs",
 ]
 
+[[package]]
+name = "draupnir-antispam"
+version = "0.1.0"
+source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=46e31bd6439eccbd3a1762f710c17fc15168c15e#46e31bd6439eccbd3a1762f710c17fc15168c15e"
+dependencies = [
+ "ruma-common",
+ "serde",
+ "serde_json",
+]
+
 [[package]]
 name = "dtor"
 version = "0.1.0"
@@ -2985,7 +2995,7 @@ checksum = "f52b00d39961fc5b2736ea853c9cc86238e165017a493d1d5c8eac6bdc4cc273"
 [[package]]
 name = "meowlnir-antispam"
 version = "0.1.0"
-source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=377d801fa035480b772c640b430097c1ec0ddb16#377d801fa035480b772c640b430097c1ec0ddb16"
+source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=46e31bd6439eccbd3a1762f710c17fc15168c15e#46e31bd6439eccbd3a1762f710c17fc15168c15e"
 dependencies = [
  "ruma-common",
  "serde",
@@ -4075,9 +4085,10 @@ checksum = "88f8660c1ff60292143c98d08fc6e2f654d722db50410e3f3797d40baaf9d8f3"
 [[package]]
 name = "ruma"
 version = "0.10.1"
-source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=377d801fa035480b772c640b430097c1ec0ddb16#377d801fa035480b772c640b430097c1ec0ddb16"
+source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=46e31bd6439eccbd3a1762f710c17fc15168c15e#46e31bd6439eccbd3a1762f710c17fc15168c15e"
 dependencies = [
  "assign",
+ "draupnir-antispam",
  "js_int",
  "js_option",
  "meowlnir-antispam",
@@ -4096,7 +4107,7 @@ dependencies = [
 [[package]]
 name = "ruma-appservice-api"
 version = "0.10.0"
-source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=377d801fa035480b772c640b430097c1ec0ddb16#377d801fa035480b772c640b430097c1ec0ddb16"
+source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=46e31bd6439eccbd3a1762f710c17fc15168c15e#46e31bd6439eccbd3a1762f710c17fc15168c15e"
 dependencies = [
  "js_int",
  "ruma-common",
@@ -4108,7 +4119,7 @@ dependencies = [
 [[package]]
 name = "ruma-client-api"
 version = "0.18.0"
-source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=377d801fa035480b772c640b430097c1ec0ddb16#377d801fa035480b772c640b430097c1ec0ddb16"
+source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=46e31bd6439eccbd3a1762f710c17fc15168c15e#46e31bd6439eccbd3a1762f710c17fc15168c15e"
 dependencies = [
  "as_variant",
  "assign",
@@ -4131,7 +4142,7 @@ dependencies = [
 [[package]]
 name = "ruma-common"
 version = "0.13.0"
-source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=377d801fa035480b772c640b430097c1ec0ddb16#377d801fa035480b772c640b430097c1ec0ddb16"
+source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=46e31bd6439eccbd3a1762f710c17fc15168c15e#46e31bd6439eccbd3a1762f710c17fc15168c15e"
 dependencies = [
  "as_variant",
  "base64 0.22.1",
@@ -4163,7 +4174,7 @@ dependencies = [
 [[package]]
 name = "ruma-events"
 version = "0.28.1"
-source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=377d801fa035480b772c640b430097c1ec0ddb16#377d801fa035480b772c640b430097c1ec0ddb16"
+source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=46e31bd6439eccbd3a1762f710c17fc15168c15e#46e31bd6439eccbd3a1762f710c17fc15168c15e"
 dependencies = [
  "as_variant",
  "indexmap",
@@ -4188,7 +4199,7 @@ dependencies = [
 [[package]]
 name = "ruma-federation-api"
 version = "0.9.0"
-source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=377d801fa035480b772c640b430097c1ec0ddb16#377d801fa035480b772c640b430097c1ec0ddb16"
+source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=46e31bd6439eccbd3a1762f710c17fc15168c15e#46e31bd6439eccbd3a1762f710c17fc15168c15e"
 dependencies = [
  "bytes",
  "headers",
@@ -4210,7 +4221,7 @@ dependencies = [
 [[package]]
 name = "ruma-identifiers-validation"
 version = "0.9.5"
-source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=377d801fa035480b772c640b430097c1ec0ddb16#377d801fa035480b772c640b430097c1ec0ddb16"
+source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=46e31bd6439eccbd3a1762f710c17fc15168c15e#46e31bd6439eccbd3a1762f710c17fc15168c15e"
 dependencies = [
  "js_int",
  "thiserror 2.0.17",
@@ -4219,7 +4230,7 @@ dependencies = [
 [[package]]
 name = "ruma-identity-service-api"
 version = "0.9.0"
-source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=377d801fa035480b772c640b430097c1ec0ddb16#377d801fa035480b772c640b430097c1ec0ddb16"
+source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=46e31bd6439eccbd3a1762f710c17fc15168c15e#46e31bd6439eccbd3a1762f710c17fc15168c15e"
 dependencies = [
  "js_int",
  "ruma-common",
@@ -4229,7 +4240,7 @@ dependencies = [
 [[package]]
 name = "ruma-macros"
 version = "0.13.0"
-source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=377d801fa035480b772c640b430097c1ec0ddb16#377d801fa035480b772c640b430097c1ec0ddb16"
+source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=46e31bd6439eccbd3a1762f710c17fc15168c15e#46e31bd6439eccbd3a1762f710c17fc15168c15e"
 dependencies = [
  "cfg-if",
  "proc-macro-crate",
@@ -4244,7 +4255,7 @@ dependencies = [
 [[package]]
 name = "ruma-push-gateway-api"
 version = "0.9.0"
-source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=377d801fa035480b772c640b430097c1ec0ddb16#377d801fa035480b772c640b430097c1ec0ddb16"
+source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=46e31bd6439eccbd3a1762f710c17fc15168c15e#46e31bd6439eccbd3a1762f710c17fc15168c15e"
 dependencies = [
  "js_int",
  "ruma-common",
@@ -4256,7 +4267,7 @@ dependencies = [
 [[package]]
 name = "ruma-signatures"
 version = "0.15.0"
-source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=377d801fa035480b772c640b430097c1ec0ddb16#377d801fa035480b772c640b430097c1ec0ddb16"
+source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=46e31bd6439eccbd3a1762f710c17fc15168c15e#46e31bd6439eccbd3a1762f710c17fc15168c15e"
 dependencies = [
  "base64 0.22.1",
  "ed25519-dalek",
diff --git a/Cargo.toml b/Cargo.toml
index 3ab0b5c0..202ea15e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -351,7 +351,7 @@ version = "0.1.2"
 # Used for matrix spec type definitions and helpers
 [workspace.dependencies.ruma]
 git = "https://forgejo.ellis.link/continuwuation/ruwuma"
-rev = "377d801fa035480b772c640b430097c1ec0ddb16"
+rev = "46e31bd6439eccbd3a1762f710c17fc15168c15e"
 features = [
     "compat",
     "rand",
diff --git a/conduwuit-example.toml b/conduwuit-example.toml
index 77b89002..ad25d4a7 100644
--- a/conduwuit-example.toml
+++ b/conduwuit-example.toml
@@ -1647,7 +1647,7 @@
 
 # Enable the tokio-console. This option is only relevant to developers.
 #
-#	For more information, see:
+#    For more information, see:
 # https://continuwuity.org/development.html#debugging-with-tokio-console
 #
 #tokio_console = false
@@ -1757,10 +1757,6 @@
 #
 #ldap = false
 
-# Configuration for antispam support
-#
-#antispam = false
-
 [global.tls]
 
 # Path to a valid TLS certificate file.
@@ -1930,7 +1926,7 @@
 
 [global.antispam.meowlnir]
 
-# The base URL on which to contact meowlnir (before /_meowlnir/antispam).
+# The base URL on which to contact Meowlnir (before /_meowlnir/antispam).
 #
 # Example: "http://127.0.0.1:29339"
 #
@@ -1944,3 +1940,24 @@
 # The management room for which to send requests
 #
 #management_room =
+
+# If enabled run all federated join attempts (both federated and local)
+# through the Meowlnir anti-spam checks.
+#
+# By default, only join attempts for rooms with the `fi.mau.spam_checker`
+# restricted join rule are checked.
+#
+#check_all_joins = false
+
+[global.antispam.draupnir]
+
+# The base URL on which to contact Draupnir (before /api/).
+#
+# Example: "http://127.0.0.1:29339"
+#
+#base_url =
+
+# The authentication secret defined in
+# web->synapseHTTPAntispam->authorization
+#
+#secret =
diff --git a/src/api/client/membership/invite.rs b/src/api/client/membership/invite.rs
index 2a546475..8b4f6d65 100644
--- a/src/api/client/membership/invite.rs
+++ b/src/api/client/membership/invite.rs
@@ -1,11 +1,9 @@
 use axum::extract::State;
 use axum_client_ip::InsecureClientIp;
 use conduwuit::{
-	Err, Result,
-	config::Antispam,
-	debug_error, err, info,
+	Err, Result, debug_error, err, info,
 	matrix::{event::gen_event_id_canonical_json, pdu::PduBuilder},
-	trace,
+	warn,
 };
 use futures::FutureExt;
 use ruma::{
@@ -15,7 +13,6 @@ use ruma::{
 		invite_permission_config::FilterLevel,
 		room::member::{MembershipState, RoomMemberEventContent},
 	},
-	meowlnir_antispam::user_may_invite,
 };
 use service::Services;
 
@@ -128,24 +125,16 @@ pub(crate) async fn invite_helper(
 		return Err!(Request(Forbidden("Invites are not allowed on this server.")));
 	}
 
-	trace!("maybe ask meowlnir");
-	if let Some(Antispam { meowlnir: Some(cfg) }) = &services.config.antispam {
-		trace!("asking meowlnir");
-		services
-			.sending
-			.send_meowlnir_antispam_request(
-				cfg,
-				user_may_invite::v1::Request::new(
-					cfg.management_room.clone(),
-					sender_user.to_owned(),
-					recipient_user.to_owned(),
-				),
-			)
-			.await
-			.inspect(|_| trace!("meowlnir :D"))
-			.inspect_err(|e| debug_error!("meowlnir sad: {e}"))?;
-	} else {
-		trace!("no meowlnir configured");
+	if let Err(e) = services
+		.antispam
+		.user_may_invite(sender_user.to_owned(), recipient_user.to_owned(), room_id.to_owned())
+		.await
+	{
+		warn!(
+			"Invite from {} to {} in room {} blocked by antispam: {e:?}",
+			sender_user, recipient_user, room_id
+		);
+		return Err!(Request(Forbidden("Invite blocked by antispam service.")));
 	}
 
 	if !services.globals.user_is_local(recipient_user) {
diff --git a/src/api/client/membership/join.rs b/src/api/client/membership/join.rs
index 25c7d663..5f53520b 100644
--- a/src/api/client/membership/join.rs
+++ b/src/api/client/membership/join.rs
@@ -3,9 +3,7 @@ use std::{borrow::Borrow, collections::HashMap, iter::once, sync::Arc};
 use axum::extract::State;
 use axum_client_ip::InsecureClientIp;
 use conduwuit::{
-	Err, Result,
-	config::Antispam,
-	debug, debug_info, debug_warn, err, error, info,
+	Err, Result, debug, debug_info, debug_warn, err, error, info,
 	matrix::{
 		StateKey,
 		event::{gen_event_id, gen_event_id_canonical_json},
@@ -39,7 +37,6 @@ use ruma::{
 			member::{MembershipState, RoomMemberEventContent},
 		},
 	},
-	meowlnir_antispam::user_may_join_room,
 };
 use service::{
 	Services,
@@ -82,6 +79,26 @@ pub(crate) async fn join_room_by_id_route(
 	)
 	.await?;
 
+	if let Err(e) = services
+		.antispam
+		.user_may_join_room(
+			sender_user.to_owned(),
+			body.room_id.clone(),
+			services
+				.rooms
+				.state_cache
+				.is_invited(sender_user, &body.room_id)
+				.await,
+		)
+		.await
+	{
+		warn!(
+			"Antispam prevented user {} from joining room {}: {}",
+			sender_user, body.room_id, e
+		);
+		return Err!(Request(Forbidden("You are not allowed to join this room.")));
+	}
+
 	// There is no body.server_name for /roomId/join
 	let mut servers: Vec<_> = services
 		.rooms
@@ -350,20 +367,6 @@ pub async fn join_room_by_id_helper(
 		.boxed()
 		.await?;
 	}
-
-	if let Some(Antispam { meowlnir: Some(cfg) }) = &services.config.antispam {
-		services
-			.sending
-			.send_meowlnir_antispam_request(
-				cfg,
-				user_may_join_room::v1::Request::new(
-					cfg.management_room.clone(),
-					sender_user.to_owned(),
-					room_id.to_owned(),
-				),
-			)
-			.await?;
-	}
 	Ok(join_room_by_id::v3::Response::new(room_id.to_owned()))
 }
 
diff --git a/src/api/server/invite.rs b/src/api/server/invite.rs
index 09b20d58..0182be33 100644
--- a/src/api/server/invite.rs
+++ b/src/api/server/invite.rs
@@ -2,9 +2,7 @@ use axum::extract::State;
 use axum_client_ip::InsecureClientIp;
 use base64::{Engine as _, engine::general_purpose};
 use conduwuit::{
-	Err, Error, PduEvent, Result,
-	config::Antispam,
-	err,
+	Err, Error, PduEvent, Result, err,
 	matrix::{Event, event::gen_event_id},
 	utils::{self, hash::sha256},
 	warn,
@@ -13,7 +11,6 @@ use ruma::{
 	CanonicalJsonValue, OwnedUserId, UserId,
 	api::{client::error::ErrorKind, federation::membership::create_invite},
 	events::room::member::{MembershipState, RoomMemberEventContent},
-	meowlnir_antispam::user_may_invite,
 	serde::JsonObject,
 };
 
@@ -151,18 +148,13 @@ pub(crate) async fn create_invite_route(
 		return Err!(Request(Forbidden("This server does not allow room invites.")));
 	}
 
-	if let Some(Antispam { meowlnir: Some(cfg) }) = &services.config.antispam {
-		services
-			.sending
-			.send_meowlnir_antispam_request(
-				cfg,
-				user_may_invite::v1::Request::new(
-					cfg.management_room.clone(),
-					sender_user.to_owned(),
-					recipient_user.clone(),
-				),
-			)
-			.await?;
+	if let Err(e) = services
+		.antispam
+		.user_may_invite(sender_user.to_owned(), recipient_user.clone(), body.room_id.clone())
+		.await
+	{
+		warn!("Antispam rejected invite: {e:?}");
+		return Err!(Request(Forbidden("Invite rejected by antispam service.")));
 	}
 
 	let mut invite_state = body.invite_room_state.clone();
diff --git a/src/api/server/make_join.rs b/src/api/server/make_join.rs
index ce46caab..a506c5bc 100644
--- a/src/api/server/make_join.rs
+++ b/src/api/server/make_join.rs
@@ -1,7 +1,7 @@
+use std::borrow::ToOwned;
+
 use axum::extract::State;
-use conduwuit::{
-	Err, Error, Result, debug_info, info, matrix::pdu::PduBuilder, utils::IterStream, warn,
-};
+use conduwuit::{Err, Error, Result, debug, debug_info, info, matrix::pdu::PduBuilder, warn};
 use conduwuit_service::Services;
 use futures::StreamExt;
 use ruma::{
@@ -136,7 +136,6 @@ pub(crate) async fn create_join_event_template_route(
 			&state_lock,
 		)
 		.await?;
-
 	drop(state_lock);
 
 	// room v3 and above removed the "event_id" field from remote PDU format
@@ -192,25 +191,52 @@ pub(crate) async fn user_can_perform_restricted_join(
 		return Ok(false);
 	}
 
-	if r.allow
-		.iter()
-		.filter_map(|rule| {
-			if let AllowRule::RoomMembership(membership) = rule {
-				Some(membership)
-			} else {
-				None
-			}
-		})
-		.stream()
-		.any(|m| services.rooms.state_cache.is_joined(user_id, &m.room_id))
-		.await
-	{
-		Ok(true)
-	} else {
-		Err!(Request(UnableToAuthorizeJoin(
-			"Joining user is not known to be in any required room."
-		)))
+	for allow_rule in &r.allow {
+		match allow_rule {
+			| AllowRule::RoomMembership(membership) => {
+				if services
+					.rooms
+					.state_cache
+					.is_joined(user_id, &membership.room_id)
+					.await
+				{
+					debug!(
+						"User {} is allowed to join room {} via membership in room {}",
+						user_id, room_id, membership.room_id
+					);
+					return Ok(true);
+				}
+			},
+			| AllowRule::UnstableSpamChecker => {
+				match services
+					.antispam
+					.meowlnir_accept_make_join(room_id.to_owned(), user_id.to_owned())
+					.await
+				{
+					| Ok(()) => {
+						return Ok(true);
+					},
+					| Err(e) => {
+						info!(
+							"meowlnir rejected restricted join for user {} into room {}: {e:?}",
+							user_id, room_id
+						);
+					},
+				}
+			},
+			| _ => {
+				debug_info!(
+					"Unsupported allow rule in restricted join for room {}: {:?}",
+					room_id,
+					allow_rule
+				);
+			},
+		}
 	}
+
+	Err!(Request(UnableToAuthorizeJoin(
+		"Joining user is not known to be in any required room."
+	)))
 }
 
 pub(crate) fn maybe_strip_event_id(
diff --git a/src/core/config/mod.rs b/src/core/config/mod.rs
index 6b474d4e..60921b0e 100644
--- a/src/core/config/mod.rs
+++ b/src/core/config/mod.rs
@@ -53,7 +53,8 @@ use crate::{Result, err, error::Error, utils::sys};
 ### For more information, see:
 ### https://continuwuity.org/configuration.html
 "#,
-	ignore = "config_paths catchall well_known tls blurhashing allow_invalid_tls_certificates_yes_i_know_what_the_fuck_i_am_doing_with_this_and_i_know_this_is_insecure"
+	ignore = "config_paths catchall well_known tls blurhashing \
+	allow_invalid_tls_certificates_yes_i_know_what_the_fuck_i_am_doing_with_this_and_i_know_this_is_insecure antispam"
 )]
 pub struct Config {
 	// Paths to config file(s). Not supposed to be set manually in the config file,
@@ -1887,7 +1888,7 @@ pub struct Config {
 
 	/// Enable the tokio-console. This option is only relevant to developers.
 	///
-	///	For more information, see:
+	///    For more information, see:
 	/// https://continuwuity.org/development.html#debugging-with-tokio-console
 	#[serde(default)]
 	pub tokio_console: bool,
@@ -2247,6 +2248,7 @@ struct ListeningAddr {
 #[derive(Clone, Debug, Deserialize)]
 pub struct Antispam {
 	pub meowlnir: Option<MeowlnirConfig>,
+	pub draupnir: Option<DraupnirConfig>,
 }
 
 #[derive(Clone, Debug, Deserialize)]
@@ -2255,7 +2257,7 @@ pub struct Antispam {
 	section = "global.antispam.meowlnir"
 )]
 pub struct MeowlnirConfig {
-	/// The base URL on which to contact meowlnir (before /_meowlnir/antispam).
+	/// The base URL on which to contact Meowlnir (before /_meowlnir/antispam).
 	///
 	/// Example: "http://127.0.0.1:29339"
 	pub base_url: Url,
@@ -2266,6 +2268,32 @@ pub struct MeowlnirConfig {
 
 	/// The management room for which to send requests
 	pub management_room: OwnedRoomId,
+
+	/// If enabled run all federated join attempts (both federated and local)
+	/// through the Meowlnir anti-spam checks.
+	///
+	/// By default, only join attempts for rooms with the `fi.mau.spam_checker`
+	/// restricted join rule are checked.
+	#[serde(default)]
+	pub check_all_joins: bool,
+}
+
+// TODO: the DraupnirConfig and MeowlnirConfig are basically identical.
+// Maybe management_room could just become an Option<> and these structs merged?
+#[derive(Clone, Debug, Deserialize)]
+#[config_example_generator(
+	filename = "conduwuit-example.toml",
+	section = "global.antispam.draupnir"
+)]
+pub struct DraupnirConfig {
+	/// The base URL on which to contact Draupnir (before /api/).
+	///
+	/// Example: "http://127.0.0.1:29339"
+	pub base_url: Url,
+
+	/// The authentication secret defined in
+	/// web->synapseHTTPAntispam->authorization
+	pub secret: String,
 }
 
 const DEPRECATED_KEYS: &[&str; 9] = &[
diff --git a/src/service/antispam/mod.rs b/src/service/antispam/mod.rs
new file mode 100644
index 00000000..d8711690
--- /dev/null
+++ b/src/service/antispam/mod.rs
@@ -0,0 +1,172 @@
+use std::sync::Arc;
+
+use async_trait::async_trait;
+use conduwuit::{Result, config::Antispam, debug};
+use ruma::{OwnedRoomId, OwnedUserId, draupnir_antispam, meowlnir_antispam};
+
+use crate::{client, config, sending, service::Dep};
+
+struct Services {
+	config: Dep<config::Service>,
+	client: Dep<client::Service>,
+}
+
+pub struct Service {
+	services: Services,
+}
+
+#[async_trait]
+impl crate::Service for Service {
+	fn build(args: crate::Args<'_>) -> Result<Arc<Self>> {
+		Ok(Arc::new(Self {
+			services: Services {
+				client: args.depend::<client::Service>("client"),
+				config: args.depend::<config::Service>("config"),
+			},
+		}))
+	}
+
+	fn name(&self) -> &str { crate::service::make_name(std::module_path!()) }
+}
+
+impl Service {
+	async fn send_antispam_request<T>(
+		&self,
+		base_url: &str,
+		secret: &str,
+		request: T,
+	) -> Result<T::IncomingResponse>
+	where
+		T: ruma::api::OutgoingRequest + std::fmt::Debug + Send,
+	{
+		sending::antispam::send_antispam_request(
+			&self.services.client.appservice,
+			base_url,
+			secret,
+			request,
+		)
+		.await
+	}
+
+	/// Checks with the antispam service whether `inviter` may invite `invitee`
+	/// to `room_id`.
+	///
+	/// If no antispam service is configured, this always returns `Ok(())`.
+	/// If an error is returned, the invite should be blocked - the antispam
+	/// service was unreachable, or refused the invite.
+	pub async fn user_may_invite(
+		&self,
+		inviter: OwnedUserId,
+		invitee: OwnedUserId,
+		room_id: OwnedRoomId,
+	) -> Result<()> {
+		if let Some(config) = &self.services.config.antispam {
+			let result = if let Some(meowlnir) = &config.meowlnir {
+				debug!("Asking meowlnir for user_may_invite");
+				self.send_antispam_request(
+					meowlnir.base_url.as_str(),
+					&meowlnir.secret,
+					meowlnir_antispam::user_may_invite::v1::Request::new(
+						meowlnir.management_room.clone(),
+						inviter,
+						invitee,
+						room_id,
+					),
+				)
+				.await
+				.inspect(|_| debug!("meowlnir allowed the invite"))
+				.inspect_err(|e| debug!("meowlnir denied the invite: {e:?}"))
+				.map(|_| ())
+			} else if let Some(draupnir) = &config.draupnir {
+				debug!("Asking draupnir for user_may_invite");
+				self.send_antispam_request(
+					draupnir.base_url.as_str(),
+					&draupnir.secret,
+					draupnir_antispam::user_may_invite::v1::Request::new(
+						room_id, inviter, invitee,
+					),
+				)
+				.await
+				.inspect(|_| debug!("draupnir allowed the invite"))
+				.inspect_err(|e| debug!("draupnir denied the invite: {e:?}"))
+				.map(|_| ())
+			} else {
+				Ok(())
+			};
+			return result;
+		}
+		Ok(())
+	}
+
+	/// Checks with the antispam service whether `user_id` may join `room_id`.
+	pub async fn user_may_join_room(
+		&self,
+		user_id: OwnedUserId,
+		room_id: OwnedRoomId,
+		is_invited: bool,
+	) -> Result<()> {
+		if let Some(config) = &self.services.config.antispam {
+			let result = if let Some(meowlnir) = &config.meowlnir {
+				debug!("Asking meowlnir for user_may_join_room");
+				self.send_antispam_request(
+					meowlnir.base_url.as_str(),
+					&meowlnir.secret,
+					meowlnir_antispam::user_may_join_room::v1::Request::new(
+						meowlnir.management_room.clone(),
+						user_id,
+						room_id,
+						is_invited,
+					),
+				)
+				.await
+				.inspect(|_| debug!("meowlnir allowed the join"))
+				.inspect_err(|e| debug!("meowlnir denied the join: {e:?}"))
+				.map(|_| ())
+			} else if let Some(draupnir) = &config.draupnir {
+				debug!("Asking draupnir for user_may_join_room");
+				self.send_antispam_request(
+					draupnir.base_url.as_str(),
+					&draupnir.secret,
+					draupnir_antispam::user_may_join_room::v1::Request::new(
+						user_id, room_id, is_invited,
+					),
+				)
+				.await
+				.inspect(|_| debug!("draupnir allowed the join"))
+				.inspect_err(|e| debug!("draupnir denied the join: {e:?}"))
+				.map(|_| ())
+			} else {
+				Ok(())
+			};
+			return result;
+		}
+		Ok(())
+	}
+
+	/// Checks with Meowlnir whether the incoming federated `make_join` request
+	/// should be allowed. Applies the `fi.mau.spam_checker` join rule.
+	pub async fn meowlnir_accept_make_join(
+		&self,
+		room_id: OwnedRoomId,
+		user_id: OwnedUserId,
+	) -> Result<()> {
+		if let Some(Antispam { meowlnir: Some(meowlnir), .. }) = &self.services.config.antispam {
+			debug!("Asking meowlnir for meowlnir_accept_make_join");
+			self.send_antispam_request(
+				meowlnir.base_url.as_str(),
+				&meowlnir.secret,
+				meowlnir_antispam::accept_make_join::v1::Request::new(
+					meowlnir.management_room.clone(),
+					user_id,
+					room_id,
+				),
+			)
+			.await
+			.inspect(|_| debug!("meowlnir allowed the make_join"))
+			.inspect_err(|e| debug!("meowlnir denied the make_join: {e:?}"))
+			.map(|_| ())
+		} else {
+			Ok(())
+		}
+	}
+}
diff --git a/src/service/mod.rs b/src/service/mod.rs
index 2ad0ecd2..1e2af7a4 100644
--- a/src/service/mod.rs
+++ b/src/service/mod.rs
@@ -1,6 +1,8 @@
 #![type_length_limit = "8192"]
 #![allow(refining_impl_trait)]
 
+extern crate conduwuit_core as conduwuit;
+extern crate conduwuit_database as database;
 mod manager;
 mod migrations;
 mod service;
@@ -10,6 +12,7 @@ pub mod state;
 pub mod account_data;
 pub mod admin;
 pub mod announcements;
+pub mod antispam;
 pub mod appservice;
 pub mod client;
 pub mod config;
@@ -30,9 +33,6 @@ pub mod transaction_ids;
 pub mod uiaa;
 pub mod users;
 
-extern crate conduwuit_core as conduwuit;
-extern crate conduwuit_database as database;
-
 use ctor::{ctor, dtor};
 pub(crate) use service::{Args, Dep, Service};
 
diff --git a/src/service/sending/antispam.rs b/src/service/sending/antispam.rs
index c21b29a7..2e328b1b 100644
--- a/src/service/sending/antispam.rs
+++ b/src/service/sending/antispam.rs
@@ -1,30 +1,23 @@
 use std::{fmt::Debug, mem};
 
 use bytes::BytesMut;
-use conduwuit::{Err, Result, config::MeowlnirConfig, debug_error, err, utils, warn};
+use conduwuit::{Err, Result, debug_error, err, utils, warn};
 use reqwest::Client;
 use ruma::api::{IncomingResponse, MatrixVersion, OutgoingRequest, SendAccessToken};
 
 /// Sends a request to an antispam service
-pub(crate) async fn send_meowlnir_request<T>(
+pub(crate) async fn send_antispam_request<T>(
 	client: &Client,
-	config: &MeowlnirConfig,
+	base_url: &str,
+	secret: &str,
 	request: T,
-) -> Result<Option<T::IncomingResponse>>
+) -> Result<T::IncomingResponse>
 where
 	T: OutgoingRequest + Debug + Send,
 {
 	const VERSIONS: [MatrixVersion; 1] = [MatrixVersion::V1_15];
-	if config.secret.is_empty() {
-		return Ok(None);
-	}
-	let secret = config.secret.as_str();
 	let http_request = request
-		.try_into_http_request::<BytesMut>(
-			config.base_url.as_str(),
-			SendAccessToken::Always(secret),
-			&VERSIONS,
-		)?
+		.try_into_http_request::<BytesMut>(base_url, SendAccessToken::Always(secret), &VERSIONS)?
 		.map(BytesMut::freeze);
 	let reqwest_request = reqwest::Request::try_from(http_request)?;
 
@@ -64,7 +57,7 @@ where
 			.expect("reqwest body is valid http body"),
 	);
 
-	response.map(Some).map_err(|e| {
+	response.map_err(|e| {
 		err!(BadServerResponse(warn!(
 			"Antispam returned invalid/malformed response bytes: {e}",
 		)))
diff --git a/src/service/sending/mod.rs b/src/service/sending/mod.rs
index b82818c4..a0ec50ed 100644
--- a/src/service/sending/mod.rs
+++ b/src/service/sending/mod.rs
@@ -1,4 +1,4 @@
-mod antispam;
+pub mod antispam;
 mod appservice;
 mod data;
 mod dest;
@@ -13,9 +13,7 @@ use std::{
 
 use async_trait::async_trait;
 use conduwuit::{
-	Result, Server,
-	config::MeowlnirConfig,
-	debug, debug_warn, err, error,
+	Result, Server, debug, debug_warn, err, error,
 	smallvec::SmallVec,
 	utils::{ReadyExt, TryReadyExt, available_parallelism, math::usize_from_u64_truncated},
 	warn,
@@ -337,18 +335,6 @@ impl Service {
 		appservice::send_request(client, registration, request).await
 	}
 
-	/// Sends a request to the chosen antispam configuration
-	pub async fn send_meowlnir_antispam_request<T>(
-		&self,
-		config: &MeowlnirConfig,
-		request: T,
-	) -> Result<Option<T::IncomingResponse>>
-	where
-		T: OutgoingRequest + Debug + Send,
-	{
-		antispam::send_meowlnir_request(&self.services.client.appservice, config, request).await
-	}
-
 	/// Clean up queued sending event data
 	///
 	/// Used after we remove an appservice registration or a user deletes a push
diff --git a/src/service/services.rs b/src/service/services.rs
index 642f61c7..5b71c536 100644
--- a/src/service/services.rs
+++ b/src/service/services.rs
@@ -8,8 +8,8 @@ use futures::{Stream, StreamExt, TryStreamExt};
 use tokio::sync::Mutex;
 
 use crate::{
-	account_data, admin, announcements, appservice, client, config, emergency, federation,
-	globals, key_backups,
+	account_data, admin, announcements, antispam, appservice, client, config, emergency,
+	federation, globals, key_backups,
 	manager::Manager,
 	media, moderation, presence, pusher, resolver, rooms, sending, server_keys, service,
 	service::{Args, Map, Service},
@@ -39,6 +39,7 @@ pub struct Services {
 	pub users: Arc<users::Service>,
 	pub moderation: Arc<moderation::Service>,
 	pub announcements: Arc<announcements::Service>,
+	pub antispam: Arc<antispam::Service>,
 
 	manager: Mutex<Option<Arc<Manager>>>,
 	pub(crate) service: Arc<Map>,
@@ -107,6 +108,7 @@ impl Services {
 			users: build!(users::Service),
 			moderation: build!(moderation::Service),
 			announcements: build!(announcements::Service),
+			antispam: build!(antispam::Service),
 
 			manager: Mutex::new(None),
 			service,