diff --git a/Cargo.lock b/Cargo.lock
index b908cb9..9a01439 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "addr2line"
@@ -17,6 +17,15 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
 
+[[package]]
+name = "aho-corasick"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e60d3430d3a69478ad0993f19238d2df97c507009a52b3c10addcd7f6bcb916"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "async-trait"
 version = "0.1.77"
@@ -57,6 +66,7 @@ dependencies = [
  "pin-project-lite",
  "rustversion",
  "serde",
+ "serde_urlencoded",
  "sync_wrapper",
  "tokio",
  "tower",
@@ -99,6 +109,27 @@ dependencies = [
  "rustc-demangle",
 ]
 
+[[package]]
+name = "bit-set"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "08807e080ed7f9d5433fa9b275196cfc35414f66a0c79d864dc51a0d825231a3"
+dependencies = [
+ "bit-vec",
+]
+
+[[package]]
+name = "bit-vec"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5e764a1d40d510daf35e07be9eb06e75770908c27d411ee6c92109c9840eaaf7"
+
+[[package]]
+name = "bitflags"
+version = "2.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b048fb63fd8b5923fc5aa7b340d8e156aec7ec02f0c78fa8a6ddc2613f6f71de"
+
 [[package]]
 name = "bytes"
 version = "1.5.0"
@@ -117,18 +148,75 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "color-eyre"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "55146f5e46f237f7423d74111267d4597b59b0dad0ffaf7303bce9945d843ad5"
+dependencies = [
+ "backtrace",
+ "color-spantrace",
+ "eyre",
+ "indenter",
+ "once_cell",
+ "owo-colors",
+ "tracing-error",
+]
+
+[[package]]
+name = "color-spantrace"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cd6be1b2a7e382e2b98b43b2adcca6bb0e465af0bdd38123873ae61eb17a72c2"
+dependencies = [
+ "once_cell",
+ "owo-colors",
+ "tracing-core",
+ "tracing-error",
+]
+
 [[package]]
 name = "equivalent"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5443807d6dff69373d433ab9ef5378ad8df50ca6298caf15de6e52e24aaf54d5"
 
+[[package]]
+name = "eyre"
+version = "0.6.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7cd915d99f24784cdc19fd37ef22b97e3ff0ae756c7e492e9fbfe897d61e2aec"
+dependencies = [
+ "indenter",
+ "once_cell",
+]
+
+[[package]]
+name = "fancy-regex"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e24cb5a94bcae1e5408b0effca5cd7172ea3c5755049c5f3af4cd283a165298"
+dependencies = [
+ "bit-set",
+ "regex-automata 0.4.8",
+ "regex-syntax 0.8.5",
+]
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
 
+[[package]]
+name = "form_urlencoded"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e13624c2627564efccf4934284bdd98cbaa14e79b0b5a141218e507b3a823456"
+dependencies = [
+ "percent-encoding",
+]
+
 [[package]]
 name = "futures-channel"
 version = "0.3.30"
@@ -287,6 +375,12 @@ dependencies = [
  "tokio",
 ]
 
+[[package]]
+name = "indenter"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ce23b50ad8242c51a442f3ff322d56b02f08852c77e4c0b4d3fd684abc89c683"
+
 [[package]]
 name = "indexmap"
 version = "2.2.4"
@@ -321,6 +415,15 @@ version = "0.4.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "90ed8c1e510134f979dbc4f070f87d4313098b704861a105fe34231c70a3901c"
 
+[[package]]
+name = "matchers"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8263075bb86c5a1b1427b5ae862e8889656f126e9f77c484496e8b47cf5c5558"
+dependencies = [
+ "regex-automata 0.1.10",
+]
+
 [[package]]
 name = "matchit"
 version = "0.7.3"
@@ -400,6 +503,12 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b15813163c1d831bf4a13c3610c05c0d03b39feb07f7e09fa234dac9b15aaf39"
 
+[[package]]
+name = "owo-colors"
+version = "3.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c1b04fb49957986fdce4d6ee7a65027d55d4b6d2265e5848bbb507b58ccfdb6f"
+
 [[package]]
 name = "percent-encoding"
 version = "2.3.1"
@@ -411,11 +520,14 @@ name = "phone"
 version = "0.1.0"
 dependencies = [
  "axum",
+ "color-eyre",
+ "fancy-regex",
  "serde",
  "thiserror",
  "tokio",
  "toml",
  "tower",
+ "tower-http",
  "tracing",
  "tracing-subscriber",
 ]
@@ -470,6 +582,50 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "regex"
+version = "1.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b544ef1b4eac5dc2db33ea63606ae9ffcfac26c1416a2806ae0bf5f56b201191"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata 0.4.8",
+ "regex-syntax 0.8.5",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c230d73fb8d8c1b9c0b3135c5142a8acee3a0558fb8db5cf1cb65f8d7862132"
+dependencies = [
+ "regex-syntax 0.6.29",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "368758f23274712b504848e9d5a6f010445cc8b87a7cdb4d7cbee666c1288da3"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax 0.8.5",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.29"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f162c6dd7b008981e4d40210aca20b4bd0f9b60ca9271061b07f78537722f2e1"
+
+[[package]]
+name = "regex-syntax"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b15c43186be67a4fd63bee50d0303afffcef381492ebe2c5d87f324e1b8815c"
+
 [[package]]
 name = "rustc-demangle"
 version = "0.1.23"
@@ -482,6 +638,12 @@ version = "1.0.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7ffc183a10b4478d04cbbbfc96d0873219d962dd5accaff2ffbd4ceb7df837f4"
 
+[[package]]
+name = "ryu"
+version = "1.0.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f3cb5ba0dc43242ce17de99c180e96db90b235b8a9fdc9543c96d2209116bd9f"
+
 [[package]]
 name = "serde"
 version = "1.0.197"
@@ -511,6 +673,18 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "serde_urlencoded"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3491c14715ca2294c4d6a88f15e84739788c1d030eed8c110436aafdaa2f3fd"
+dependencies = [
+ "form_urlencoded",
+ "itoa",
+ "ryu",
+ "serde",
+]
+
 [[package]]
 name = "sharded-slab"
 version = "0.1.7"
@@ -696,10 +870,26 @@ dependencies = [
 ]
 
 [[package]]
-name = "tower-layer"
-version = "0.3.2"
+name = "tower-http"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c20c8dbed6283a09604c3e69b4b7eeb54e298b8a600d4d5ecb5ad39de609f1d0"
+checksum = "8437150ab6bbc8c5f0f519e3d5ed4aa883a83dd4cdd3d1b21f9482936046cb97"
+dependencies = [
+ "bitflags",
+ "bytes",
+ "http",
+ "http-body",
+ "pin-project-lite",
+ "tower-layer",
+ "tower-service",
+ "tracing",
+]
+
+[[package]]
+name = "tower-layer"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "121c2a6cda46980bb0fcd1647ffaf6cd3fc79a013de288782836f6df9c48780e"
 
 [[package]]
 name = "tower-service"
@@ -739,6 +929,16 @@ dependencies = [
  "valuable",
 ]
 
+[[package]]
+name = "tracing-error"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d686ec1c0f384b1277f097b2f279a2ecc11afe8c133c1aabf036a27cb4cd206e"
+dependencies = [
+ "tracing",
+ "tracing-subscriber",
+]
+
 [[package]]
 name = "tracing-log"
 version = "0.2.0"
@@ -756,10 +956,14 @@ version = "0.3.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ad0f048c97dbd9faa9b7df56362b8ebcaa52adb06b498c050d2f4e32f90a7a8b"
 dependencies = [
+ "matchers",
  "nu-ansi-term",
+ "once_cell",
+ "regex",
  "sharded-slab",
  "smallvec",
  "thread_local",
+ "tracing",
  "tracing-core",
  "tracing-log",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index 73624c9..f4bbdef 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,7 +11,10 @@ lto = "fat"
 axum = { version = "0.7.2", default-features = false, features = [
   "http1",
   "tokio",
+  "query",
 ] }
+color-eyre = "0.6.3"
+fancy-regex = "0.14.0"
 serde = { version = "1.0.195", features = ["derive"] }
 thiserror = "1.0.51"
 tokio = { version = "1.35.1", features = [
@@ -22,5 +25,6 @@ tokio = { version = "1.35.1", features = [
 ] }
 toml = "0.8.8"
 tower = { version = "0.4.13", default-features = false, features = ["limit"] }
+tower-http = { version = "0.6.1", features = ["trace"] }
 tracing = "0.1.40"
-tracing-subscriber = "0.3.18"
+tracing-subscriber = { version = "0.3.18", features = ["env-filter"] }
diff --git a/src/config.rs b/src/config.rs
index 1ae03e3..199d6cb 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -1,12 +1,21 @@
-use std::{
-    collections::HashMap,
-    error::Error,
-    net::{IpAddr, Ipv4Addr},
-    path::{Path, PathBuf},
-};
+use std::collections::HashMap;
+use std::env;
+use std::net::{IpAddr, Ipv4Addr};
+use std::path::PathBuf;
 
+use color_eyre::eyre::{self, bail, Context};
+use fancy_regex::Regex;
 use serde::{Deserialize, Serialize};
-use tokio::io::AsyncReadExt;
+use tokio::io::{AsyncReadExt, AsyncWriteExt};
+use tracing::{error, info, instrument};
+
+#[derive(Deserialize, Serialize, Debug)]
+#[repr(transparent)]
+pub struct DomainMatcher(#[serde(with = "regex")] Regex);
+
+pub fn cast_matcher(v: &[DomainMatcher]) -> &[Regex] {
+    unsafe { std::mem::transmute(v) }
+}
 
 #[derive(Serialize, Deserialize, Debug)]
 #[serde(default)]
@@ -15,6 +24,7 @@ pub struct Config {
     pub port: u16,
     pub concurrency: usize,
     pub repos: HashMap<String, RepoConfig>,
+    pub domains: Vec<DomainMatcher>,
 }
 
 impl Default for Config {
@@ -24,6 +34,7 @@ impl Default for Config {
             port: 5000,
             concurrency: 8,
             repos: HashMap::new(),
+            domains: Vec::new(),
         }
     }
 }
@@ -46,15 +57,87 @@ pub struct SecretRule {
     pub value: String,
 }
 
-pub async fn load(file: impl AsRef<Path>) -> Result<Config, Box<dyn Error>> {
-    let mut buf = String::new();
-
-    tokio::fs::OpenOptions::new()
+#[instrument(name = "config")]
+pub async fn load() -> eyre::Result<Config> {
+    let config_file = env::var(format!(
+        "{}_CONFIG",
+        env!("CARGO_BIN_NAME").to_uppercase().replace('-', "_")
+    ))
+    .unwrap_or(String::from("config.toml"));
+    match tokio::fs::OpenOptions::new()
         .read(true)
-        .open(&file)
-        .await?
-        .read_to_string(&mut buf)
-        .await?;
-
-    Ok(toml::from_str(&buf)?)
+        .open(&config_file)
+        .await
+    {
+        Ok(mut file) => {
+            let mut buf = String::new();
+            file.read_to_string(&mut buf)
+                .await
+                .context("couldn't read configuration file")?;
+            toml::from_str(&buf).context("couldn't parse configuration")
+        }
+        Err(err) => match err.kind() {
+            std::io::ErrorKind::NotFound => {
+                let config = Config::default();
+                info!("configuration file doesn't exist, creating");
+                match tokio::fs::OpenOptions::new()
+                    .write(true)
+                    .create(true)
+                    .truncate(true)
+                    .open(&config_file)
+                    .await
+                {
+                    Ok(mut file) => file
+                        .write_all(
+                            toml::to_string_pretty(&config)
+                                .context("couldn't serialize configuration")?
+                                .as_bytes(),
+                        )
+                        .await
+                        .unwrap_or_else(|err| error!("couldn't write configuration: {}", err)),
+                    Err(err) => {
+                        error!("couldn't open file {:?} for writing: {}", &config_file, err)
+                    }
+                }
+                Ok(config)
+            }
+            _ => bail!("couldn't open config file: {}", err),
+        },
+    }
+}
+
+mod regex {
+    use fancy_regex::Regex;
+    use serde::{de::Visitor, Deserializer, Serialize, Serializer};
+
+    pub fn deserialize<'de, D>(d: D) -> Result<Regex, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct RegexVisitor;
+        impl<'v> Visitor<'v> for RegexVisitor {
+            type Value = Regex;
+
+            fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
+                write!(formatter, "a regex string")
+            }
+
+            fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
+            where
+                E: serde::de::Error,
+            {
+                let regex = Regex::new(v);
+                regex.map_err(|err| serde::de::Error::custom(err))
+            }
+        }
+
+        d.deserialize_string(RegexVisitor)
+    }
+
+    pub fn serialize<S>(value: &Regex, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        value.as_str().serialize(serializer)
+    }
 }
diff --git a/src/main.rs b/src/main.rs
index cf42ec2..60ff2e5 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,22 +1,27 @@
-#![feature(let_chains, fs_try_exists, io_error_more)]
+#![feature(let_chains, io_error_more)]
 
 mod config;
 mod update_repo;
 
-use std::{env, sync::Arc};
+use std::sync::Arc;
+use std::time::Duration;
 
-use axum::{
-    extract::{Path, State},
-    http::{HeaderMap, StatusCode},
-    response::{IntoResponse, Response},
-    routing::post,
-    Router,
-};
-use config::{Config, SecretRule};
+use axum::extract::{Path, Query, State};
+use axum::http::{HeaderMap, Request, StatusCode};
+use axum::response::{IntoResponse, Response};
+use axum::routing::{get, post};
+use axum::Router;
+use color_eyre::eyre::{self, Context};
+use config::{cast_matcher, Config, SecretRule};
 use thiserror::Error;
 use tokio::net::TcpListener;
 use tower::limit::ConcurrencyLimitLayer;
-use tracing::error;
+use tower_http::trace::TraceLayer;
+use tracing::level_filters::LevelFilter;
+use tracing::{error, info, info_span, Span};
+use tracing_subscriber::layer::SubscriberExt;
+use tracing_subscriber::util::SubscriberInitExt;
+use tracing_subscriber::EnvFilter;
 use update_repo::update_repo;
 
 use crate::config::RepoConfig;
@@ -63,14 +68,37 @@ async fn update_repo_handler(
     }
 }
 
-#[tokio::main]
-async fn main() {
-    tracing_subscriber::fmt::init();
+#[derive(serde::Deserialize)]
+struct AskQuery {
+    domain: String,
+}
 
-    let mut config: Config =
-        config::load(env::var("PHONE_CONFIG").unwrap_or(String::from("config.toml")))
-            .await
-            .unwrap_or_else(|err| panic!("failed to load config: {}", err));
+async fn ask(
+    State(config): State<Arc<Config>>,
+    Query(AskQuery { domain }): Query<AskQuery>,
+) -> StatusCode {
+    for matcher in cast_matcher(&config.domains) {
+        if matcher.is_match(&domain).is_ok_and(|x| x) {
+            return StatusCode::OK;
+        }
+    }
+
+    StatusCode::NOT_FOUND
+}
+
+#[tokio::main]
+async fn main() -> eyre::Result<()> {
+    color_eyre::install()?;
+    tracing_subscriber::registry()
+        .with(
+            EnvFilter::builder()
+                .with_default_directive(LevelFilter::INFO.into())
+                .from_env_lossy(),
+        )
+        .with(tracing_subscriber::fmt::layer())
+        .init();
+
+    let mut config: Config = config::load().await.context("failed to load config")?;
 
     config.repos = config
         .repos
@@ -98,12 +126,32 @@ async fn main() {
     let app = Router::new()
         .route("/update_repo/:repo", post(update_repo_handler))
         .layer(ConcurrencyLimitLayer::new(8))
-        .with_state(Arc::clone(&config));
+        .route("/ask", get(ask))
+        .with_state(Arc::clone(&config))
+        .layer(
+            TraceLayer::new_for_http()
+                .make_span_with(|request: &Request<_>| {
+                    info_span!(
+                        "request",
+                        method = ?request.method(),
+                        path = ?request.uri().path(),
+                    )
+                })
+                .on_response(|response: &Response<_>, duration: Duration, span: &Span| {
+                    let _ = span.enter();
+                    let status = response.status();
+                    info!(?status, ?duration, "response");
+                }),
+        );
 
     let address = (config.host, config.port);
-    let listener = TcpListener::bind(address).await.unwrap();
-    let local_addr = listener.local_addr().unwrap();
-    tracing::info!("listening on http://{}", local_addr);
+    let listener = TcpListener::bind(address).await.context("failed to bind")?;
+    let local_addr = listener.local_addr().context("failed to get local addr")?;
+    info!("listening on http://{}", local_addr);
 
-    axum::serve(listener, app).await.unwrap();
+    axum::serve(listener, app)
+        .await
+        .context("failed to serve app")?;
+
+    Ok(())
 }