diff --git a/Cargo.toml b/Cargo.toml
index 8689857..5f5a803 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,9 +21,9 @@ tokio = { version = "1.0.0", features = ["io-util", "io-std", "macros", "net", "
 tokio-tungstenite = { version = "0.17.1", features = ["connect", "native-tls"]}
 url = { version = "2.0.0" }
 
-# [lib]
-# name = "block_explorer_cli"
-# path = "src/lib.rs"
+[lib]
+name = "block_explorer_cli"
+path = "src/lib.rs"
 
 [[bin]]
 name = "block-explorer-cli"
diff --git a/src/bin.rs b/src/bin.rs
index 13e8dc6..51e223c 100644
--- a/src/bin.rs
+++ b/src/bin.rs
@@ -1,10 +1,7 @@
-use anyhow::{anyhow, Ok};
 use clap::{Subcommand, Parser};
-use futures_util::{SinkExt, StreamExt};
 use serde::{Deserialize, Serialize};
-use url::Url;
-use std::{env, time::Duration};
-use tokio_tungstenite::{connect_async_tls_with_config, tungstenite::protocol::Message};
+use std::{env};
+use block_explorer_cli::fetch_blocks;
 
 #[derive(Parser)]
 #[clap(name = "CLI block explorer with mempool.space websocket - WIP")]
@@ -74,51 +71,6 @@ async fn main() {
 
 }
 
-async fn fetch_blocks(url: Url, message: String) -> anyhow::Result<()> {
-
-    let (mut websocket_stream, _ws_res) = connect_async_tls_with_config(url, None, None)
-        .await
-        .expect("failed to connect with url");
-    println!("websocket handshake successfully completed!");
-
-    if let Err(_) = websocket_stream.send(Message::text(message)).await {
-        return Err(anyhow!("Failed to send first message to websocket"));
-    }
-
-    // need to ping every so often to keep websocket alive
-    let mut pinger = tokio::time::interval(Duration::from_secs(60));
-
-    loop {
-        tokio::select! {
-            message = websocket_stream.next() => {
-                if let Some(message) = message {
-                    match message? {
-                        Message::Text(text) => {
-                            let obj: serde_json::Value = serde_json::from_str(&text).unwrap();
-                            println!("{}", serde_json::to_string_pretty(&obj).unwrap());
-                        },
-                        Message::Close(_) => {
-                            eprintln!("websocket closing gracefully");
-                            break;
-                        },
-                        Message::Binary(_) => {
-                            eprintln!("unexpected binary message");
-                            break;
-                        },
-                        _ => { /*ignore*/ }
-                    }
-                }
-            }
-            _ = pinger.tick() => {
-                websocket_stream.send(Message::Ping(vec![])).await.unwrap()
-            }
-        }
-    }
-
-    Ok(())
-
-}
-
 fn build_request_message(cli: &Cli) -> String {
 
     match &cli.command {
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..c6ba83e
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,67 @@
+use anyhow::{anyhow, Ok};
+use futures_util::{SinkExt, StreamExt};
+use serde::{Deserialize};
+use url::Url;
+use std::{time::Duration};
+use tokio_tungstenite::{connect_async_tls_with_config, tungstenite::protocol::Message};
+
+#[derive(Deserialize, Debug)]
+#[allow(dead_code)]
+struct MempoolSpaceBlock {
+    id: String, // TODO: (@leonardo.lima) parse this into BlockHash type from rust-bitcoin
+    previousblockhash: String, // TODO: (@leonardo.lima) parse this into BlockHash type from rust-bitcoin
+    height: u32,
+    timestamp: u32,
+}
+
+#[derive(Deserialize, Debug)]
+#[allow(dead_code)]
+struct MempoolSpaceWebSocketMessage {
+    block: MempoolSpaceBlock,
+    // TODO: (@leonardo.lima) should we use the other fields: difficult adjustment, mempool-info ?
+}
+
+pub async fn fetch_blocks(url: Url, message: String) -> anyhow::Result<()> {
+
+  let (mut websocket_stream, _ws_res) = connect_async_tls_with_config(url, None, None)
+      .await
+      .expect("failed to connect with url");
+  println!("websocket handshake successfully completed!");
+
+  if let Err(_) = websocket_stream.send(Message::text(message)).await {
+      return Err(anyhow!("Failed to send first message to websocket"));
+  }
+
+  // need to ping every so often to keep websocket alive
+  let mut pinger = tokio::time::interval(Duration::from_secs(60));
+
+  loop {
+      tokio::select! {
+          message = websocket_stream.next() => {
+              if let Some(message) = message {
+                  match message? {
+                      Message::Text(text) => {
+                          let obj: MempoolSpaceWebSocketMessage = serde_json::from_str(&text).unwrap();
+                          println!("{:?}", &obj);
+                      },
+                      Message::Close(_) => {
+                          eprintln!("websocket closing gracefully");
+                          break;
+                      },
+                      Message::Binary(_) => {
+                          eprintln!("unexpected binary message");
+                          break;
+                      },
+                      _ => { /*ignore*/ }
+                  }
+              }
+          }
+          _ = pinger.tick() => {
+              websocket_stream.send(Message::Ping(vec![])).await.unwrap()
+          }
+      }
+  }
+
+  Ok(())
+
+}
\ No newline at end of file