diff --git a/wasm/src/main.rs b/wasm/src/main.rs
index 2b1848b..b1d4d68 100644
--- a/wasm/src/main.rs
+++ b/wasm/src/main.rs
@@ -3,6 +3,7 @@ use fluence::WasmLoggerBuilder;
 mod dto;
 mod results;
 mod service_api;
+mod service_impl;
 mod storage_impl;
 
 pub fn main() {
diff --git a/wasm/src/results.rs b/wasm/src/results.rs
index dce4cfd..9be3faa 100644
--- a/wasm/src/results.rs
+++ b/wasm/src/results.rs
@@ -1,5 +1,5 @@
 use crate::dto::Certificate;
-use crate::service_api::ServiceError;
+use crate::service_impl::ServiceError;
 use fluence::fce;
 
 #[fce]
diff --git a/wasm/src/service_api.rs b/wasm/src/service_api.rs
index 916d45c..c34bce1 100644
--- a/wasm/src/service_api.rs
+++ b/wasm/src/service_api.rs
@@ -1,47 +1,9 @@
-use crate::dto::{Certificate, DtoConversionError};
+use crate::dto::Certificate;
 use crate::results::{AllCertsResult, InsertResult, WeightResult};
-use crate::storage_impl::get_data;
+use crate::service_impl::{
+    get_all_certs_impl, get_weight_impl, insert_cert_impl, insert_cert_impl_raw,
+};
 use fluence::fce;
-use fluence_identity::public_key::PKError;
-use fluence_identity::{KeyPair, PublicKey};
-use std::convert::{Into, TryInto};
-use std::str::FromStr;
-use std::time::Duration;
-use thiserror::Error as ThisError;
-use trust_graph::{CertificateError, TrustGraphError};
-
-#[derive(ThisError, Debug)]
-pub enum ServiceError {
-    #[error("{0}")]
-    PublicKeyDecodeError(#[from] PKError),
-    #[error("{0}")]
-    TGError(#[from] TrustGraphError),
-    #[error("{0}")]
-    CertError(#[from] CertificateError),
-    #[error("{0}")]
-    DtoError(#[from] DtoConversionError),
-}
-
-fn add_cert(certificate: trust_graph::Certificate, duration: u64) -> Result<(), ServiceError> {
-    let duration = Duration::from_millis(duration);
-    let mut tg = get_data().lock();
-    tg.add(certificate, duration)?;
-    Ok(())
-}
-
-fn insert_cert_impl_raw(certificate: String, duration: u64) -> Result<(), ServiceError> {
-    let certificate = trust_graph::Certificate::from_str(&certificate)?;
-
-    add_cert(certificate, duration)?;
-    Ok(())
-}
-
-fn insert_cert_impl(certificate: Certificate, duration: u64) -> Result<(), ServiceError> {
-    let certificate: trust_graph::Certificate = certificate.try_into()?;
-
-    add_cert(certificate, duration)?;
-    Ok(())
-}
 
 #[fce]
 /// add a certificate in string representation to trust graph if it is valid
@@ -58,64 +20,41 @@ fn insert_cert(certificate: Certificate, current_time: u64) -> InsertResult {
     insert_cert_impl(certificate, current_time).into()
 }
 
-fn get_weight_impl(public_key: String) -> Result<Option<u32>, ServiceError> {
-    let tg = get_data().lock();
-
-    let public_key = string_to_public_key(public_key)?;
-
-    let weight = tg.weight(public_key)?;
-
-    Ok(weight)
-}
-
 #[fce]
 fn get_weight(public_key: String) -> WeightResult {
     get_weight_impl(public_key).into()
 }
 
-fn string_to_public_key(public_key: String) -> Result<PublicKey, ServiceError> {
-    let public_key = PublicKey::from_base58(&public_key)?;
-
-    Ok(public_key)
-}
-
 #[fce]
 fn get_all_certs(issued_for: String) -> AllCertsResult {
     get_all_certs_impl(issued_for).into()
 }
 
-fn get_all_certs_impl(issued_for: String) -> Result<Vec<Certificate>, ServiceError> {
-    let tg = get_data().lock();
-
-    let public_key = string_to_public_key(issued_for)?;
-    let certs = tg.get_all_certs(public_key, &[])?;
-    Ok(certs.into_iter().map(|c| c.into()).collect())
-}
-
-#[fce]
-fn test() -> String {
-    let mut tg = get_data().lock();
-
-    let root_kp = KeyPair::generate();
-    let root_kp2 = KeyPair::generate();
-    let second_kp = KeyPair::generate();
-
-    let expires_at = Duration::new(15, 15);
-    let issued_at = Duration::new(5, 5);
-
-    let cert = trust_graph::Certificate::issue_root(
-        &root_kp,
-        second_kp.public_key(),
-        expires_at,
-        issued_at,
-    );
-    tg.add_root_weight(root_kp.public().into(), 0).unwrap();
-    tg.add_root_weight(root_kp2.public().into(), 1).unwrap();
-    tg.add(cert, Duration::new(10, 10)).unwrap();
-
-    let a = tg.get(second_kp.public_key()).unwrap();
-    let str = format!("{:?}", a);
-    log::info!("{}", &str);
-
-    str
-}
+// TODO rewrite test after #[fce_test] will be implemented
+// #[fce]
+// fn test() -> String {
+//     let mut tg = get_data().lock();
+//
+//     let root_kp = KeyPair::generate();
+//     let root_kp2 = KeyPair::generate();
+//     let second_kp = KeyPair::generate();
+//
+//     let expires_at = Duration::new(15, 15);
+//     let issued_at = Duration::new(5, 5);
+//
+//     let cert = trust_graph::Certificate::issue_root(
+//         &root_kp,
+//         second_kp.public_key(),
+//         expires_at,
+//         issued_at,
+//     );
+//     tg.add_root_weight(root_kp.public().into(), 0).unwrap();
+//     tg.add_root_weight(root_kp2.public().into(), 1).unwrap();
+//     tg.add(cert, Duration::new(10, 10)).unwrap();
+//
+//     let a = tg.get(second_kp.public_key()).unwrap();
+//     let str = format!("{:?}", a);
+//     log::info!("{}", &str);
+//
+//     str
+// }
diff --git a/wasm/src/service_impl.rs b/wasm/src/service_impl.rs
new file mode 100644
index 0000000..4d2007a
--- /dev/null
+++ b/wasm/src/service_impl.rs
@@ -0,0 +1,63 @@
+use crate::dto::{Certificate, DtoConversionError};
+use crate::storage_impl::get_data;
+use fluence_identity::public_key::PKError;
+use fluence_identity::PublicKey;
+use std::convert::{Into, TryInto};
+use std::str::FromStr;
+use std::time::Duration;
+use thiserror::Error as ThisError;
+use trust_graph::{CertificateError, TrustGraphError};
+
+#[derive(ThisError, Debug)]
+pub enum ServiceError {
+    #[error("{0}")]
+    PublicKeyDecodeError(#[from] PKError),
+    #[error("{0}")]
+    TGError(#[from] TrustGraphError),
+    #[error("{0}")]
+    CertError(#[from] CertificateError),
+    #[error("{0}")]
+    DtoError(#[from] DtoConversionError),
+}
+
+pub fn get_weight_impl(public_key: String) -> Result<Option<u32>, ServiceError> {
+    let tg = get_data().lock();
+    let public_key = string_to_public_key(public_key)?;
+    let weight = tg.weight(public_key)?;
+    Ok(weight)
+}
+
+fn add_cert(certificate: trust_graph::Certificate, duration: u64) -> Result<(), ServiceError> {
+    let duration = Duration::from_millis(duration);
+    let mut tg = get_data().lock();
+    tg.add(certificate, duration)?;
+    Ok(())
+}
+
+pub fn insert_cert_impl_raw(certificate: String, duration: u64) -> Result<(), ServiceError> {
+    let certificate = trust_graph::Certificate::from_str(&certificate)?;
+
+    add_cert(certificate, duration)?;
+    Ok(())
+}
+
+fn string_to_public_key(public_key: String) -> Result<PublicKey, ServiceError> {
+    let public_key = PublicKey::from_base58(&public_key)?;
+
+    Ok(public_key)
+}
+
+pub fn get_all_certs_impl(issued_for: String) -> Result<Vec<Certificate>, ServiceError> {
+    let tg = get_data().lock();
+
+    let public_key = string_to_public_key(issued_for)?;
+    let certs = tg.get_all_certs(public_key, &[])?;
+    Ok(certs.into_iter().map(|c| c.into()).collect())
+}
+
+pub fn insert_cert_impl(certificate: Certificate, duration: u64) -> Result<(), ServiceError> {
+    let certificate: trust_graph::Certificate = certificate.try_into()?;
+
+    add_cert(certificate, duration)?;
+    Ok(())
+}