diff --git a/src/bin/trainee-tracker.rs b/src/bin/trainee-tracker.rs
index c3c2bd7..98f7b37 100644
--- a/src/bin/trainee-tracker.rs
+++ b/src/bin/trainee-tracker.rs
@@ -110,6 +110,10 @@ async fn main() {
             "/api/expected-attendance",
             get(trainee_tracker::endpoints::expected_attendance),
         )
+        .route(
+            "/api/started-itp",
+            get(trainee_tracker::endpoints::started_itp),
+        )
         .route(
             "/codility/verify-webhook",
             post(trainee_tracker::codility::verify_webhook),
diff --git a/src/endpoints.rs b/src/endpoints.rs
index fef2505..0a17f62 100644
--- a/src/endpoints.rs
+++ b/src/endpoints.rs
@@ -1,4 +1,7 @@
-use std::{collections::BTreeMap, ops::AddAssign};
+use std::{
+    collections::{BTreeMap, BTreeSet},
+    ops::AddAssign,
+};
 
 use ::octocrab::models::{Author, teams::RequestedTeam};
 use anyhow::Context;
@@ -18,7 +21,7 @@ use crate::{
     Error, ServerState,
     github_accounts::get_trainees,
     newtypes::GithubLogin,
-    octocrab::{all_pages, octocrab},
+    octocrab::{all_pages, octocrab, octocrab_for_maybe_token},
     prs::{PrWithReviews, fill_in_reviewers, get_prs},
     register::{Attendance, get_register},
     sheets::sheets_client,
@@ -331,3 +334,30 @@ pub async fn expected_attendance(
     }
     Json(expected_attendance)
 }
+
+pub async fn started_itp(
+    session: Session,
+    State(server_state): State<ServerState>,
+    OriginalUri(original_uri): OriginalUri,
+) -> Result<Json<BTreeSet<GithubLogin>>, Error> {
+    let octocrab = octocrab(&session, &server_state, original_uri).await;
+    // Allow un-authenticated requests to this endpoint.
+    let octocrab = if let Ok(octocrab) = octocrab {
+        octocrab
+    } else {
+        octocrab_for_maybe_token(None)?
+    };
+    let prs = all_pages("pull requests", &octocrab, async || {
+        octocrab
+            .pulls(server_state.config.github_org, "Module-Onboarding")
+            .list()
+            .send()
+            .await
+    })
+    .await?;
+    let usernames: BTreeSet<_> = prs
+        .into_iter()
+        .filter_map(|pr| Some(GithubLogin::from(pr.user?.login)))
+        .collect();
+    Ok(Json(usernames))
+}
diff --git a/src/octocrab.rs b/src/octocrab.rs
index b05dc52..f694ea6 100644
--- a/src/octocrab.rs
+++ b/src/octocrab.rs
@@ -39,6 +39,19 @@ pub(crate) async fn octocrab(
 }
 
 pub fn octocrab_for_token(token: String) -> Result<Octocrab, Error> {
+    octocrab_for_maybe_token(Some(token))
+}
+
+pub fn octocrab_for_maybe_token(token: Option<String>) -> Result<Octocrab, Error> {
+    let header_value = if let Some(token) = token {
+        Some(
+            HeaderValue::from_str(&format!("Bearer {token}"))
+                .context("Token couldn't used as a header")?,
+        )
+    } else {
+        None
+    };
+
     let connector = HttpsConnectorBuilder::new()
         .with_webpki_roots()
         .https_only()
@@ -67,10 +80,7 @@ pub fn octocrab_for_token(token: String) -> Result<Octocrab, Error> {
             HeaderValue::from_static("octocrab"),
         )])))
         .with_layer(&AuthHeaderLayer::new(
-            Some(
-                HeaderValue::from_str(&format!("Bearer {token}"))
-                    .context("Token couldn't used as a header")?,
-            ),
+            header_value,
             Uri::from_static(GITHUB_BASE_URI),
             Uri::from_static(GITHUB_BASE_UPLOAD_URI),
         ))