diff --git a/Cargo.toml b/Cargo.toml
index 5f6ec5c..743ab7c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,8 +22,9 @@ axum = { version = "0.7.0", default-features = false,  optional = true }
 reqwest = { version = "0.11.0", default-features = false, optional = true }
 
 [dev-dependencies]
+axum = { version = "0.7.0", features = ["tokio", "http1"], default-features = false }
 reqwest = { version = "0.11.0", features = ["rustls-tls-webpki-roots"], default-features = false }
-tokio = { version = "1.0.0", features = ["rt", "macros"], default-features = false }
+tokio = { version = "1.0.0", features = ["macros"], default-features = false }
 
 [features]
 client = ["dep:reqwest"]
@@ -41,10 +42,6 @@ perf = "deny"
 style = "deny"
 suspicious = "deny"
 
-[[example]]
+[[test]]
 name = "lud06"
-required-features = ["client"]
-
-[[example]]
-name = "lud16"
-required-features = ["client"]
+required-features = ["client", "server"]
diff --git a/README.md b/README.md
index 07b70d3..3a25a5d 100644
--- a/README.md
+++ b/README.md
@@ -9,26 +9,26 @@ This library works as a toolkit so you can serve and make your LNURL requests wi
 
 ## Current support
 
-- [LUD-01](https://github.com/lnurl/luds/blob/luds/01.md): 🆘 core ⚠️ client 🆘 server ⚠️ example 🆘 test
-- [LUD-02](https://github.com/lnurl/luds/blob/luds/02.md): 🆘 core ⚠️ client 🆘 server 🆘 example 🆘 test
-- [LUD-03](https://github.com/lnurl/luds/blob/luds/03.md): 🆘 core ⚠️ client 🆘 server 🆘 example 🆘 test
-- [LUD-04](https://github.com/lnurl/luds/blob/luds/04.md): 🆘 core 🆘 client 🆘 server 🆘 example 🆘 test
-- [LUD-05](https://github.com/lnurl/luds/blob/luds/05.md): 🆘 core 🆘 client 🆘 server 🆘 example 🆘 test
-- [LUD-06](https://github.com/lnurl/luds/blob/luds/06.md): 🆘 core ⚠️ client 🆘 server ⚠️ example 🆘 test
-- [LUD-07](https://github.com/lnurl/luds/blob/luds/07.md): 🆘 core 🆘 client 🆘 server 🆘 example 🆘 test
-- [LUD-08](https://github.com/lnurl/luds/blob/luds/08.md): 🆘 core 🆘 client 🆘 server 🆘 example 🆘 test
-- [LUD-09](https://github.com/lnurl/luds/blob/luds/09.md): 🆘 core ⚠️ client 🆘 server 🆘 example 🆘 test
-- [LUD-10](https://github.com/lnurl/luds/blob/luds/10.md): 🆘 core 🆘 client 🆘 server 🆘 example 🆘 test
-- [LUD-11](https://github.com/lnurl/luds/blob/luds/11.md): 🆘 core ⚠️ client 🆘 server 🆘 example 🆘 test
-- [LUD-12](https://github.com/lnurl/luds/blob/luds/12.md): 🆘 core ⚠️ client 🆘 server 🆘 example 🆘 test
-- [LUD-13](https://github.com/lnurl/luds/blob/luds/13.md): 🆘 core 🆘 client 🆘 server 🆘 example 🆘 test
-- [LUD-14](https://github.com/lnurl/luds/blob/luds/14.md): 🆘 core 🆘 client 🆘 server 🆘 example 🆘 test
-- [LUD-15](https://github.com/lnurl/luds/blob/luds/15.md): 🆘 core 🆘 client 🆘 server 🆘 example 🆘 test
-- [LUD-16](https://github.com/lnurl/luds/blob/luds/16.md): 🆘 core ⚠️ client 🆘 server ⚠️ example 🆘 test
-- [LUD-17](https://github.com/lnurl/luds/blob/luds/17.md): 🆘 core 🆘 client 🆘 server 🆘 example 🆘 test
-- [LUD-18](https://github.com/lnurl/luds/blob/luds/18.md): 🆘 core 🆘 client 🆘 server 🆘 example 🆘 test
-- [LUD-19](https://github.com/lnurl/luds/blob/luds/19.md): 🆘 core 🆘 client 🆘 server 🆘 example 🆘 test
-- [LUD-20](https://github.com/lnurl/luds/blob/luds/20.md): 🆘 core ⚠️ client 🆘 server 🆘 example 🆘 test
+- [LUD-01](https://github.com/lnurl/luds/blob/luds/01.md): ⚠️ core ⚠️ client ⚠️ server 🆘 tests
+- [LUD-02](https://github.com/lnurl/luds/blob/luds/02.md): ⚠️ core ⚠️ client 🆘 server 🆘 tests
+- [LUD-03](https://github.com/lnurl/luds/blob/luds/03.md): ⚠️ core ⚠️ client 🆘 server 🆘 tests
+- [LUD-04](https://github.com/lnurl/luds/blob/luds/04.md): 🆘 core 🆘 client 🆘 server 🆘 tests
+- [LUD-05](https://github.com/lnurl/luds/blob/luds/05.md): 🆘 core 🆘 client 🆘 server 🆘 tests
+- [LUD-06](https://github.com/lnurl/luds/blob/luds/06.md): ✅ core ⚠️ client ⚠️ server ⚠️ tests
+- [LUD-07](https://github.com/lnurl/luds/blob/luds/07.md): 🆘 core 🆘 client 🆘 server 🆘 tests
+- [LUD-08](https://github.com/lnurl/luds/blob/luds/08.md): 🆘 core 🆘 client 🆘 server 🆘 tests
+- [LUD-09](https://github.com/lnurl/luds/blob/luds/09.md): ⚠️ core ⚠️ client 🆘 server 🆘 tests
+- [LUD-10](https://github.com/lnurl/luds/blob/luds/10.md): 🆘 core 🆘 client 🆘 server 🆘 tests
+- [LUD-11](https://github.com/lnurl/luds/blob/luds/11.md): ⚠️ core ⚠️ client 🆘 server 🆘 tests
+- [LUD-12](https://github.com/lnurl/luds/blob/luds/12.md): ⚠️ core ⚠️ client 🆘 server 🆘 tests
+- [LUD-13](https://github.com/lnurl/luds/blob/luds/13.md): 🆘 core 🆘 client 🆘 server 🆘 tests
+- [LUD-14](https://github.com/lnurl/luds/blob/luds/14.md): 🆘 core 🆘 client 🆘 server 🆘 tests
+- [LUD-15](https://github.com/lnurl/luds/blob/luds/15.md): 🆘 core 🆘 client 🆘 server 🆘 tests
+- [LUD-16](https://github.com/lnurl/luds/blob/luds/16.md): ⚠️ core ⚠️ client 🆘 server 🆘 tests
+- [LUD-17](https://github.com/lnurl/luds/blob/luds/17.md): 🆘 core 🆘 client 🆘 server 🆘 tests
+- [LUD-18](https://github.com/lnurl/luds/blob/luds/18.md): 🆘 core 🆘 client 🆘 server 🆘 tests
+- [LUD-19](https://github.com/lnurl/luds/blob/luds/19.md): 🆘 core 🆘 client 🆘 server 🆘 tests
+- [LUD-20](https://github.com/lnurl/luds/blob/luds/20.md): ⚠️ core ⚠️ client 🆘 server 🆘 tests
 
 - ###### Soon. ™
 
diff --git a/examples/lud06.rs b/examples/lud06.rs
deleted file mode 100644
index af2d88e..0000000
--- a/examples/lud06.rs
+++ /dev/null
@@ -1,19 +0,0 @@
-#[tokio::main(flavor = "current_thread")]
-async fn main() {
-    let client = lnurlkit::client::Client::default();
-
-    let queried = client
-        .query("lnurl1dp68gurn8ghj7cnfwpsjuctswqhjuam9d3kz66mwdamkutmvde6hymrs9a4k2mn4cdry4t")
-        .await
-        .expect("query");
-
-    println!("{queried:?}");
-
-    let lnurlkit::client::Query::PayRequest(pr) = queried else {
-        panic!("not pay request");
-    };
-
-    let invoice = pr.callback("comment", 123000).await.expect("callback");
-
-    println!("{invoice:?}");
-}
diff --git a/examples/lud16.rs b/examples/lud16.rs
deleted file mode 100644
index 23e5062..0000000
--- a/examples/lud16.rs
+++ /dev/null
@@ -1,16 +0,0 @@
-#[tokio::main(flavor = "current_thread")]
-async fn main() {
-    let client = lnurlkit::client::Client::default();
-
-    let queried = client.query("kenu@bipa.app").await.expect("address");
-
-    println!("{queried:?}");
-
-    let lnurlkit::client::Query::PayRequest(pr) = queried else {
-        panic!("not pay request");
-    };
-
-    let invoice = pr.callback("comment", 123000).await.expect("callback");
-
-    println!("{invoice:?}");
-}
diff --git a/src/client.rs b/src/client.rs
index 35e3d76..ec24606 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -38,19 +38,19 @@ pub enum Query<'a> {
 #[derive(Clone, Debug)]
 pub struct PayRequest<'a> {
     client: &'a reqwest::Client,
-    core: crate::core::pay_request::PayRequest,
+    pub core: crate::core::pay_request::PayRequest,
 }
 
 #[derive(Clone, Debug)]
 pub struct ChannelRequest<'a> {
     client: &'a reqwest::Client,
-    core: crate::core::channel_request::ChannelRequest,
+    pub core: crate::core::channel_request::ChannelRequest,
 }
 
 #[derive(Clone, Debug)]
 pub struct WithdrawalRequest<'a> {
     client: &'a reqwest::Client,
-    core: crate::core::withdrawal_request::WithdrawalRequest,
+    pub core: crate::core::withdrawal_request::WithdrawalRequest,
 }
 
 impl PayRequest<'_> {
diff --git a/src/core/pay_request.rs b/src/core/pay_request.rs
index c40555e..d640e41 100644
--- a/src/core/pay_request.rs
+++ b/src/core/pay_request.rs
@@ -2,7 +2,7 @@ pub const TAG: &str = "payRequest";
 
 #[derive(Clone, Debug)]
 pub struct PayRequest {
-    callback: crate::serde::Url,
+    pub callback: url::Url,
     pub short_description: String,
     pub long_description: Option<String>,
     pub success_action: Option<SuccessAction>,
@@ -78,7 +78,7 @@ impl std::str::FromStr for PayRequest {
             });
 
         Ok(PayRequest {
-            callback: p.callback,
+            callback: p.callback.0,
             min: p.min_sendable,
             max: p.max_sendable,
             short_description,
@@ -130,8 +130,9 @@ impl std::fmt::Display for PayRequest {
         });
 
         f.write_str(&miniserde::json::to_string(&ser::QueryResponse {
+            tag: TAG,
             metadata,
-            callback: &self.callback,
+            callback: &crate::serde::Url(self.callback.clone()),
             min_sendable: self.min,
             max_sendable: self.max,
             comment_allowed: self.comment_size,
@@ -146,7 +147,7 @@ impl PayRequest {
     /// Returns errors on network or deserialization failures.
     #[must_use]
     pub fn callback(mut self, comment: &str, millisatoshis: u64) -> url::Url {
-        self.callback.0.query_pairs_mut().extend_pairs(
+        self.callback.query_pairs_mut().extend_pairs(
             [
                 (!comment.is_empty()).then_some(("comment", comment)),
                 Some(("amount", &millisatoshis.to_string())),
@@ -155,7 +156,7 @@ impl PayRequest {
             .flatten(),
         );
 
-        self.callback.0
+        self.callback
     }
 }
 
@@ -186,6 +187,7 @@ mod ser {
 
     #[derive(Serialize)]
     pub(super) struct QueryResponse<'a> {
+        pub tag: &'static str,
         pub metadata: String,
         pub callback: &'a Url,
         #[serde(rename = "minSendable")]
diff --git a/src/server.rs b/src/server.rs
index d1f9605..7e55239 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -1,6 +1,10 @@
 use axum::{http::StatusCode, routing::get, Router};
 use std::future::Future;
 
+pub fn builder<P>() -> Server<P> {
+    Server { pay_request: None }
+}
+
 pub struct Server<P> {
     pub pay_request: Option<P>,
 }
diff --git a/tests/lud06.rs b/tests/lud06.rs
new file mode 100644
index 0000000..b4ba913
--- /dev/null
+++ b/tests/lud06.rs
@@ -0,0 +1,65 @@
+#[tokio::test]
+async fn test() {
+    let listener = tokio::net::TcpListener::bind("0.0.0.0:0")
+        .await
+        .expect("net");
+
+    let addr = listener.local_addr().expect("addr");
+
+    let query_url = format!("http://{addr}/lnurlp");
+    let callback_url = url::Url::parse(&format!("http://{addr}/lnurlp/callback")).expect("url");
+
+    let router = {
+        let mut router = lnurlkit::server::builder();
+
+        router.pay_request = Some(move || {
+            let callback = callback_url.clone();
+
+            async {
+                Ok(lnurlkit::core::pay_request::PayRequest {
+                    callback,
+                    short_description: String::from("today i become death"),
+                    long_description: Some(String::from("the destroyer of worlds")),
+                    success_action: None,
+                    jpeg: None,
+                    png: None,
+                    comment_size: 0,
+                    min: 314,
+                    max: 315,
+                })
+            }
+        });
+
+        router.build()
+    };
+
+    tokio::spawn(async move {
+        axum::serve(listener, router).await.expect("serve");
+    });
+
+    let client = lnurlkit::client::Client::default();
+
+    let lnurl = bech32::encode(
+        "lnurl",
+        bech32::ToBase32::to_base32(&query_url),
+        bech32::Variant::Bech32,
+    )
+    .expect("lnurl");
+
+    let queried = client.query(&lnurl).await.expect("query");
+
+    println!("{queried:?}");
+
+    let lnurlkit::client::Query::PayRequest(pr) = queried else {
+        panic!("not pay request");
+    };
+
+    assert_eq!(pr.core.min, 314);
+    assert_eq!(pr.core.max, 315);
+    assert_eq!(pr.core.short_description, "today i become death");
+    assert_eq!(pr.core.long_description.unwrap(), "the destroyer of worlds");
+
+    // let invoice = pr.callback("comment", 123000).await.expect("callback");
+
+    // println!("{invoice:?}");
+}