diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..4327f8c
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,164 @@
+pub mod model;
+
+use clap::Parser;
+
+#[derive(Debug, Clone, Parser)]
+struct CliArgs {
+	homeserver: String,
+	
+	token: String,
+
+	user_id: String,
+}
+
+pub struct FediClient {
+	http: reqwest::Client,
+	homeserver: String,
+	token: String,
+	user_id: String,
+}
+
+impl FediClient {
+	pub fn new(homeserver: String, user_id: String, token: String) -> Self {
+		let http = reqwest::Client::default();
+		FediClient {
+			http, homeserver, token, user_id,
+		}
+	}
+
+	pub fn url(&self, endpoint: &str) -> String {
+		format!("https://{}/api/v1/{}", self.homeserver, endpoint)
+	}
+
+	pub fn headers(&self) -> reqwest::header::HeaderMap {
+		let mut headers = reqwest::header::HeaderMap::new();
+		headers.insert("Authorization", format!("Bearer {}", self.token).parse().unwrap());
+		headers
+	}
+
+	pub async fn lists(&self) -> reqwest::Result<Vec<model::FediList>> {
+		self.http
+			.get(self.url("lists"))
+			.headers(self.headers())
+			.send()
+			.await?
+			.error_for_status()?
+			.json()
+			.await
+	}
+
+	pub async fn list_accounts(&self, list: &str) -> reqwest::Result<Vec<model::FediUser>> {
+		self.http
+			.get(self.url(&format!("lists/{list}/accounts")))
+			.headers(self.headers())
+			.query(&[("with_relationships", true)]) // TODO ?? without &[] it panics: "unsupported pair"
+			.send()
+			.await?
+			.error_for_status()?
+			.json()
+			.await
+	}
+
+	pub async fn list_add_accounts(&self, list: &str, account_ids: Vec<String>) -> reqwest::Result<()> {
+		self.http
+			.post(self.url(&format!("lists/{list}/accounts")))
+			.headers(self.headers())
+			.json(&model::FediAccountIds { account_ids })
+			.send()
+			.await?
+			.error_for_status()?;
+		Ok(())
+	}
+
+	pub async fn list_remove_accounts(&self, list: &str, account_ids: Vec<String>) -> reqwest::Result<()> {
+		self.http
+			.delete(self.url(&format!("lists/{list}/accounts")))
+			.headers(self.headers())
+			.json(&model::FediAccountIds { account_ids })
+			.send()
+			.await?
+			.error_for_status()?;
+		Ok(())
+	}
+
+	async fn get_related_users(&self, user_id: &str, relation: &str) -> reqwest::Result<Vec<model::FediUser>> {
+		let mut out = Vec::new();
+		let limit = 40; // TODO make it customizable? idk
+		loop {
+			let mut page : Vec<model::FediUser> = self.http
+				.get(self.url(&format!("accounts/{user_id}/{relation}")))
+				.headers(self.headers())
+				.query(&[("limit", limit)])
+				.query(&[("with_relationships", true)])
+				.send()
+				.await?
+				.error_for_status()?
+				.json()
+				.await?;
+			let count = page.len();
+			out.append(&mut page); // TODO can i just concat these vecs at the end?
+			if count != limit { break } // end of pages
+		}
+		Ok(out)
+	}
+
+	pub async fn followers(&self) -> reqwest::Result<Vec<model::FediUser>> {
+		self.get_related_users(&self.user_id, "followers").await
+	}
+
+	pub async fn following(&self) -> reqwest::Result<Vec<model::FediUser>> {
+		self.get_related_users(&self.user_id, "following").await
+	}
+}
+
+
+#[tokio::main]
+async fn main() {
+	tracing_subscriber::fmt()
+		.compact()
+		.init();
+
+	let args = CliArgs::parse();
+
+	let client = FediClient::new(args.homeserver, args.user_id, args.token);
+
+	let mut mutuals = std::collections::BTreeMap::new();
+
+	client.followers()
+		.await.unwrap()
+		.into_iter()
+		.filter(|u| match u.pleroma.relationship {
+			model::EmptyOption::Some(ref relation) => relation.following,
+			model::EmptyOption::None {} => {
+				tracing::warn!("missing relationships for user '{}', skipping", u.fqn);
+				false
+			},
+		}).for_each(|u| { mutuals.insert(u.fqn.clone(), u); });
+
+	let lists = client.lists().await.unwrap();
+	// TODO create mutuals list if not present
+	let mutuals_list = lists.iter().find(|l| l.title == "mutuals").expect("no mutuals list!");
+	let current_mutuals = client.list_accounts(&mutuals_list.id).await.unwrap();
+
+	// first remove all users that aren't mutuals anymore
+	let mut user_ids = Vec::new();
+	for usr in current_mutuals {
+		if mutuals.contains_key(&usr.fqn) {
+			tracing::debug!("user '{}' is still a mutual", usr.fqn);
+			mutuals.remove(&usr.fqn);
+		} else {
+			tracing::info!("removing mutual '{}'", usr.fqn);
+			user_ids.push(usr.id.clone());
+		}
+	}
+	client.list_remove_accounts(&mutuals_list.id, user_ids).await.unwrap();
+
+	// then add all new mutuals
+	let mut user_ids = Vec::new();
+	for (_id, usr) in mutuals {
+		tracing::info!("adding new mutual '{}'", usr.fqn);
+		user_ids.push(usr.id.clone());
+	}
+	client.list_add_accounts(&mutuals_list.id, user_ids).await.unwrap();
+
+}
diff --git a/src/model.rs b/src/model.rs
new file mode 100644
index 0000000..c80a0c8
--- /dev/null
+++ b/src/model.rs
@@ -0,0 +1,166 @@
+#[derive(Debug, Clone, serde::Serialize)]
+pub struct FediAccountIds {
+	pub account_ids: Vec<String>,
+}
+
+#[derive(Debug, Clone, serde::Deserialize)]
+pub struct FediList {
+	pub id: String, // TODO fuck you pleroma these are NUMBERS!!!!
+	pub title: String,
+}
+
+#[derive(Debug, Clone, serde::Deserialize)]
+pub struct FediUserField {
+	pub name: String,
+	pub value: String,
+}
+
+#[derive(Debug, Clone, serde::Deserialize)]
+pub struct FediEmoji {
+	pub url: String,
+	pub shortcode: String,
+	pub static_url: String,
+	pub visible_in_picker: bool,
+}
+
+#[derive(Debug, Clone, serde::Deserialize)]
+pub struct FediUser {
+	pub id: String,
+	pub header: String,
+	pub fields: Vec<FediUserField>,
+	pub source: FediUserSource,
+	pub pleroma: FediUserProperties,
+	pub url: String,
+	pub username: String,
+	pub created_at: String, // chrono::DateTime<chrono::Utc>,
+	pub emojis: Vec<FediEmoji>,
+	pub akkoma: Option<FediUserAkkomaExtra>,
+	pub following_count: u32,
+	pub note: String,
+	pub last_status_at: Option<String>, // Option<chrono::DateTime<chrono::Utc>>,
+	pub acct: String,
+	pub avatar: String,
+	pub avatar_static: String,
+	pub bot: bool,
+	pub display_name: String,
+	pub followers_count: u32,
+	pub fqn: String,
+	pub header_static: String,
+	pub locked: bool,
+	pub statuses_count: u32,
+}
+
+#[derive(Debug, Clone, serde::Deserialize)]
+pub struct FediUserProperties {
+	pub background_image: Option<String>,
+	pub skip_thread_containment: bool,
+	pub tags: Vec<String>,
+	pub ap_id: String,
+	pub also_known_as: Vec<String>,
+	pub hide_follows: bool,
+	pub hide_follows_count: bool,
+	pub hide_followers: bool,
+	pub hide_followers_count: bool,
+	pub is_confirmed: bool,
+	pub is_suggested: bool,
+	pub is_moderator: bool,
+	pub is_admin: bool,
+	pub hide_favorites: bool,
+	pub favicon: Option<String>,
+	pub relationship: EmptyOption<FediUserRelationship>,
+	pub deactivated: bool,
+}
+
+#[derive(Debug, Clone, serde::Deserialize)]
+pub struct FediUserRelationship {
+	pub id: String,
+	pub following: bool,
+	pub note: String,
+	pub blocked_by: bool,
+	pub blocking: bool,
+	pub domain_blocking: bool,
+	pub endorsed: bool,
+	pub followed_by: bool,
+	pub muting: bool,
+	pub muting_notifications: bool,
+	pub notifying: bool,
+	pub requested: bool,
+	pub requested_by: bool,
+	pub showing_reblogs: bool,
+	pub subscribing: bool,
+}
+
+#[derive(Debug, Clone, serde::Deserialize)]
+pub struct FediUserSource {
+	pub sensitive: bool,
+	pub fields: Vec<FediUserField>,
+	pub pleroma: FediUserSourceType,
+	pub note: String,
+}
+
+#[derive(Debug, Clone, serde::Deserialize)]
+pub struct FediUserSourceType {
+	pub actor_type: String,
+	pub discoverable: bool,
+}
+
+#[derive(Debug, Clone, serde::Deserialize)]
+pub struct FediUserAkkomaExtra {
+	pub instance: FediUserAkkomaExtraInstance,
+	pub status_ttl_days: Option<u32>,
+}
+
+#[derive(Debug, Clone, serde::Deserialize)]
+pub struct FediUserAkkomaExtraInstance {
+	pub name: String,
+	pub favicon: Option<String>,
+	pub nodeinfo: Option<NodeInfo>,
+}
+
+#[allow(non_snake_case)]
+#[derive(Debug, Clone, serde::Deserialize)]
+pub struct NodeInfo {
+	pub openRegistrations: Option<bool>,
+	pub protocols: Option<Vec<String>>,
+	pub services: Option<NodeInfoServices>,
+	pub software: Option<NodeInfoSoftware>,
+	pub version: Option<String>,
+	pub metadata: Option<serde_json::Value>,
+}
+
+#[allow(non_snake_case)]
+#[derive(Debug, Clone, serde::Deserialize)]
+pub struct NodeInfoServices {
+	pub inbound: Vec<String>,
+	pub outbound: Vec<String>,
+}
+
+#[allow(non_snake_case)]
+#[derive(Debug, Clone, serde::Deserialize)]
+pub struct NodeInfoSoftware {
+	pub name: String,
+	pub version: String,
+}
+
+#[allow(non_snake_case)]
+#[derive(Debug, Clone, serde::Deserialize)]
+pub struct NodeInfoUsage {
+	pub localPosts: u32,
+	pub users: NodeInfoUsageUsers,
+}
+
+#[allow(non_snake_case)]
+#[derive(Debug, Clone, serde::Deserialize)]
+pub struct NodeInfoUsageUsers {
+	pub activeHalfYear: u32,
+	pub activeMonth: u32,
+	pub total: u32,
+}
+
+#[derive(Debug, Clone, serde::Deserialize)]
+#[serde(deny_unknown_fields)]
+#[serde(untagged)]
+pub enum EmptyOption<T> { // pleroma sets "relationship" to an empty object.... WHYYYY
+	Some(T),
+	None {},
+}