diff --git a/crates/matrix-sdk-crypto-nodejs/Cargo.toml b/crates/matrix-sdk-crypto-nodejs/Cargo.toml
index b5c0525c0..c00cfafd1 100644
--- a/crates/matrix-sdk-crypto-nodejs/Cargo.toml
+++ b/crates/matrix-sdk-crypto-nodejs/Cargo.toml
@@ -30,6 +30,7 @@ vodozemac = {  git = "https://github.com/matrix-org/vodozemac/", rev = "d0e74428
 napi = { git = "https://github.com/Hywan/napi-rs", branch = "feat-tonapivalue-u16", default-features = false, features = ["napi4", "tokio_rt"] }
 napi-derive = "2.4.1"
 serde_json = "1.0.79"
+http = "0.2.6"
 
 [build-dependencies]
 napi-build = "2.0.0"
\ No newline at end of file
diff --git a/crates/matrix-sdk-crypto-nodejs/src/lib.rs b/crates/matrix-sdk-crypto-nodejs/src/lib.rs
index f35771cdb..f8bf7e463 100644
--- a/crates/matrix-sdk-crypto-nodejs/src/lib.rs
+++ b/crates/matrix-sdk-crypto-nodejs/src/lib.rs
@@ -18,6 +18,7 @@
 
 mod errors;
 pub mod events;
+pub mod responses;
 pub mod identifiers;
 pub mod machine;
 pub mod requests;
diff --git a/crates/matrix-sdk-crypto-nodejs/src/machine.rs b/crates/matrix-sdk-crypto-nodejs/src/machine.rs
index 7f31e1e5a..1ec39373c 100644
--- a/crates/matrix-sdk-crypto-nodejs/src/machine.rs
+++ b/crates/matrix-sdk-crypto-nodejs/src/machine.rs
@@ -4,9 +4,11 @@ use std::collections::{BTreeMap, HashMap};
 
 use napi::Either;
 use napi_derive::*;
-use ruma::{DeviceKeyAlgorithm, UInt};
+use ruma::{DeviceKeyAlgorithm, OwnedTransactionId, UInt};
 
-use crate::{identifiers, into_err, requests, sync_events};
+use crate::{
+    identifiers, into_err, requests, responses, responses::response_from_string, sync_events,
+};
 
 /// State machine implementation of the Olm/Megolm encryption protocol
 /// used for Matrix end to end encryption.
@@ -132,6 +134,24 @@ impl OlmMachine {
             .map_err(into_err)
     }
 
+    #[napi]
+    pub async fn mark_request_as_sent(
+        &self,
+        request_id: String,
+        request_type: requests::RequestType,
+        response: String,
+    ) -> Result<bool, napi::Error> {
+        let transaction_id = OwnedTransactionId::from(request_id);
+        let response = response_from_string(response.as_str()).map_err(into_err)?;
+        let incoming_response = responses::OwnedResponse::try_from((request_type, response))?;
+
+        self.inner
+            .mark_request_as_sent(&transaction_id, &incoming_response)
+            .await
+            .map(|_| true)
+            .map_err(into_err)
+    }
+
     #[napi]
     pub async fn update_tracked_users(&self, users: Vec<&identifiers::UserId>) {
         let users: Vec<ruma::OwnedUserId> =
diff --git a/crates/matrix-sdk-crypto-nodejs/src/responses.rs b/crates/matrix-sdk-crypto-nodejs/src/responses.rs
new file mode 100644
index 000000000..1594c7142
--- /dev/null
+++ b/crates/matrix-sdk-crypto-nodejs/src/responses.rs
@@ -0,0 +1,125 @@
+use matrix_sdk_crypto::IncomingResponse;
+pub(crate) use ruma::api::client::{
+    backup::add_backup_keys::v3::Response as KeysBackupResponse,
+    keys::{
+        claim_keys::v3::Response as KeysClaimResponse, get_keys::v3::Response as KeysQueryResponse,
+        upload_keys::v3::Response as KeysUploadResponse,
+        upload_signatures::v3::Response as SignatureUploadResponse,
+    },
+    message::send_message_event::v3::Response as RoomMessageResponse,
+    to_device::send_event_to_device::v3::Response as ToDeviceResponse,
+};
+use ruma::api::IncomingResponse as RumaIncomingResponse;
+
+use crate::{into_err, requests::RequestType};
+
+pub(crate) fn response_from_string(body: &str) -> http::Result<http::Response<Vec<u8>>> {
+    http::Response::builder().status(200).body(body.as_bytes().to_vec())
+}
+
+/// Intermediate private type to store an incoming owned response,
+/// without the need to manage lifetime.
+pub(crate) enum OwnedResponse {
+    KeysUpload(KeysUploadResponse),
+    KeysQuery(KeysQueryResponse),
+    KeysClaim(KeysClaimResponse),
+    ToDevice(ToDeviceResponse),
+    SignatureUpload(SignatureUploadResponse),
+    RoomMessage(RoomMessageResponse),
+    KeysBackup(KeysBackupResponse),
+}
+
+impl From<KeysUploadResponse> for OwnedResponse {
+    fn from(response: KeysUploadResponse) -> Self {
+        OwnedResponse::KeysUpload(response)
+    }
+}
+
+impl From<KeysQueryResponse> for OwnedResponse {
+    fn from(response: KeysQueryResponse) -> Self {
+        OwnedResponse::KeysQuery(response)
+    }
+}
+
+impl From<KeysClaimResponse> for OwnedResponse {
+    fn from(response: KeysClaimResponse) -> Self {
+        OwnedResponse::KeysClaim(response)
+    }
+}
+
+impl From<ToDeviceResponse> for OwnedResponse {
+    fn from(response: ToDeviceResponse) -> Self {
+        OwnedResponse::ToDevice(response)
+    }
+}
+
+impl From<SignatureUploadResponse> for OwnedResponse {
+    fn from(response: SignatureUploadResponse) -> Self {
+        Self::SignatureUpload(response)
+    }
+}
+
+impl From<RoomMessageResponse> for OwnedResponse {
+    fn from(response: RoomMessageResponse) -> Self {
+        OwnedResponse::RoomMessage(response)
+    }
+}
+
+impl From<KeysBackupResponse> for OwnedResponse {
+    fn from(r: KeysBackupResponse) -> Self {
+        Self::KeysBackup(r)
+    }
+}
+
+impl TryFrom<(RequestType, http::Response<Vec<u8>>)> for OwnedResponse {
+    type Error = napi::Error;
+
+    fn try_from(
+        (request_type, response): (RequestType, http::Response<Vec<u8>>),
+    ) -> Result<Self, Self::Error> {
+        match request_type {
+            RequestType::KeysUpload => {
+                KeysUploadResponse::try_from_http_response(response).map(Into::into)
+            }
+
+            RequestType::KeysQuery => {
+                KeysQueryResponse::try_from_http_response(response).map(Into::into)
+            }
+
+            RequestType::KeysClaim => {
+                KeysClaimResponse::try_from_http_response(response).map(Into::into)
+            }
+
+            RequestType::ToDevice => {
+                ToDeviceResponse::try_from_http_response(response).map(Into::into)
+            }
+
+            RequestType::SignatureUpload => {
+                SignatureUploadResponse::try_from_http_response(response).map(Into::into)
+            }
+
+            RequestType::RoomMessage => {
+                RoomMessageResponse::try_from_http_response(response).map(Into::into)
+            }
+
+            RequestType::KeysBackup => {
+                KeysBackupResponse::try_from_http_response(response).map(Into::into)
+            }
+        }
+        .map_err(into_err)
+    }
+}
+
+impl<'a> From<&'a OwnedResponse> for IncomingResponse<'a> {
+    fn from(response: &'a OwnedResponse) -> Self {
+        match response {
+            OwnedResponse::KeysUpload(response) => IncomingResponse::KeysUpload(response),
+            OwnedResponse::KeysQuery(response) => IncomingResponse::KeysQuery(response),
+            OwnedResponse::KeysClaim(response) => IncomingResponse::KeysClaim(response),
+            OwnedResponse::ToDevice(response) => IncomingResponse::ToDevice(response),
+            OwnedResponse::SignatureUpload(response) => IncomingResponse::SignatureUpload(response),
+            OwnedResponse::RoomMessage(response) => IncomingResponse::RoomMessage(response),
+            OwnedResponse::KeysBackup(response) => IncomingResponse::KeysBackup(response),
+        }
+    }
+}