diff --git a/esplora-api/src/lib.rs b/esplora-api/src/lib.rs
index 2553c60..c765e4a 100644
--- a/esplora-api/src/lib.rs
+++ b/esplora-api/src/lib.rs
@@ -1,30 +1,31 @@
 //! Esplora API
 //!
 //! Author: Vincenzo Palazzo <vincenzopalazzo@member.fsf.org>
-use std::io;
-
 use curl::easy::Easy;
+use curl::Error;
 use serde_json as json;
 
+type Result<T> = core::result::Result<T, Error>;
+
 pub struct EsploraAPI {
     base_url: String,
 }
 
 impl EsploraAPI {
     /// Create a new instance of the esplora API client.
-    pub fn new(url: &str) -> io::Result<Self> {
+    pub fn new(url: &str) -> Result<Self> {
         Ok(Self {
             base_url: url.to_owned(),
         })
     }
 
-    pub fn client(&self, addons: &str) -> io::Result<Easy> {
+    pub fn client(&self, addons: &str) -> Result<Easy> {
         let mut easy = Easy::new();
         easy.url(&format!("{}/{addons}", self.base_url))?;
         Ok(easy)
     }
 
-    pub fn raw_post(&self, addons: &str, body: &[u8]) -> io::Result<Vec<u8>> {
+    pub fn raw_post(&self, addons: &str, body: &[u8]) -> Result<Vec<u8>> {
         let mut easy = self.client(addons)?;
         easy.post(true)?;
         easy.post_fields_copy(body)?;
@@ -42,7 +43,7 @@ impl EsploraAPI {
         Ok(body)
     }
 
-    pub fn raw_call(&self, addons: &str) -> io::Result<Vec<u8>> {
+    pub fn raw_call(&self, addons: &str) -> Result<Vec<u8>> {
         let mut easy = self.client(addons)?;
         let mut body = Vec::new();
         {
@@ -58,21 +59,23 @@ impl EsploraAPI {
     }
 
     // perform a generic call
-    pub fn call<D: serde::de::DeserializeOwned>(&self, addons: &str) -> io::Result<D> {
+    pub fn call<D: serde::de::DeserializeOwned>(&self, addons: &str) -> Result<D> {
         let body = self.raw_call(addons)?;
-        let parsed_json: D = json::from_slice(&body)?;
+        let parsed_json: D = json::from_slice(&body).map_err(|e| {
+            let mut err = Error::new(400);
+            err.set_extra(format!("{e}"));
+            err
+        })?;
         Ok(parsed_json)
     }
 }
 
 #[cfg(test)]
 mod tests {
-    use std::io;
-
     use super::*;
 
     #[test]
-    fn test_tip() -> io::Result<()> {
+    fn test_tip() -> Result<()> {
         let api = EsploraAPI::new("https://blockstream.info/api")?;
         let hash = api.raw_call("blocks/tip/hash")?;
         let hash = String::from_utf8(hash).unwrap();