diff --git a/src/middleware/perDeveloperConcurrency.ts b/src/middleware/perDeveloperConcurrency.ts
new file mode 100644
index 0000000..9d5bac1
--- /dev/null
+++ b/src/middleware/perDeveloperConcurrency.ts
@@ -0,0 +1 @@
+// TODO: Limit concurrent deduct calls per developer to prevent burst exhaustion of Soroban RPC.
diff --git a/src/routes/billing/deduct.ts b/src/routes/billing/deduct.ts
new file mode 100644
index 0000000..9c0f16f
--- /dev/null
+++ b/src/routes/billing/deduct.ts
@@ -0,0 +1 @@
+// TODO: Deduct route with per-developer concurrency middleware.