diff --git a/BOUNDARY_TESTS_SUMMARY.md b/BOUNDARY_TESTS_SUMMARY.md
new file mode 100644
index 0000000..1d0b129
--- /dev/null
+++ b/BOUNDARY_TESTS_SUMMARY.md
@@ -0,0 +1,68 @@
+# Boundary Tests Implementation Summary
+
+## Overview
+Added comprehensive boundary tests for the POST /api/streams route validation rules, specifically for `durationSeconds` and `totalAmount` parameters.
+
+## Tests Added
+
+### Duration Boundary Tests
+Located in: `backend/src/index.test.ts` (lines ~618-664)
+
+1. **Test: durationSeconds = 59 (below minimum)**
+   - Sends request with `durationSeconds: 59`
+   - Expects: `400` status code
+   - Expects: Error message "durationSeconds must be at least 60 seconds"
+   - Validates the lower boundary is enforced
+
+2. **Test: durationSeconds = 60 (minimum boundary)**
+   - Sends request with `durationSeconds: 60`
+   - Expects: `201` status code (success)
+   - Validates the exact minimum boundary is accepted
+
+### Amount Precision Boundary Tests
+Located in: `backend/src/index.test.ts` (lines ~666-744)
+
+1. **Test: totalAmount = 0.0000001 (1 stroop - minimum valid)**
+   - Sends request with `totalAmount: 0.0000001` (7 decimal places)
+   - Expects: `201` status code (success)
+   - Validates that the smallest Stellar amount (1 stroop) is accepted
+
+2. **Test: totalAmount = 0**
+   - Sends request with `totalAmount: 0`
+   - Expects: `400` status code
+   - Expects: Error message "Amount must be greater than zero"
+   - Validates zero amounts are rejected
+
+3. **Test: totalAmount with 8 decimal places**
+   - Sends request with `totalAmount: 100.12345678` (8 decimal places)
+   - Expects: `400` status code
+   - Expects: Error message "Amount cannot have more than 7 decimal places"
+   - Validates precision limit is enforced
+
+4. **Test: totalAmount with exactly 7 decimal places**
+   - Sends request with `totalAmount: 100.1234567` (7 decimal places)
+   - Expects: `201` status code (success)
+   - Validates the maximum precision boundary is accepted
+
+## Validation Schema Reference
+The validation logic tested here is implemented in:
+- `backend/src/validation/schemas.ts`
+  - `durationSecondsSchema`: Enforces minimum of 60 seconds
+  - `totalAmountSchema`: Enforces positive values and maximum 7 decimal places
+
+## Acceptance Criteria ✅
+- ✅ Duration boundary (59 vs 60) is tested explicitly
+- ✅ Stroop-level minimum amount (0.0000001) is accepted
+- ✅ More than 7 decimal places is rejected with clear message "Amount cannot have more than 7 decimal places"
+- ✅ Zero amount is rejected with clear message "Amount must be greater than zero"
+- ✅ All tests follow the existing test pattern with proper assertions
+
+## Test Structure
+All boundary tests are organized under the existing `describe("POST /api/streams")` block with two sub-describe blocks:
+1. `describe("Duration boundary tests")`
+2. `describe("Amount precision boundary tests")`
+
+This organization makes it easy to find and maintain these specific boundary test cases.
+
+## Additional Fix
+Fixed a syntax error in `backend/src/index.ts` (lines 1040-1090) where duplicate code was causing compilation failures. Removed the duplicate query parsing and filtering logic in the recipients route handler.
diff --git a/backend/package-lock.json b/backend/package-lock.json
index 94709c6..5a9fc64 100644
--- a/backend/package-lock.json
+++ b/backend/package-lock.json
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diff --git a/backend/src/index.test.ts b/backend/src/index.test.ts
index d0737aa..7c9fada 100644
--- a/backend/src/index.test.ts
+++ b/backend/src/index.test.ts
@@ -612,6 +612,134 @@ it("returns 400 when durationSeconds is below the 60-second minimum", async () =
       ]),
     );
   });
+
+  // ══════════════════════════════════════════════════════════════════════════
+  // Boundary Tests for Duration and Amount Validation
+  // ══════════════════════════════════════════════════════════════════════════
+
+  describe("Duration boundary tests", () => {
+    it("returns 400 when durationSeconds is 59 (below minimum)", async () => {
+      const response = await request(app)
+        .post("/api/streams")
+        .set("Authorization", "Bearer mock_token")
+        .send({
+          sender: SENDER_A,
+          recipient: RECIPIENT_1,
+          assetCode: "USDC",
+          totalAmount: 100,
+          durationSeconds: 59,
+        });
+
+      expect(response.status).toBe(400);
+      expect(response.body.code).toBe("VALIDATION_ERROR");
+      expect(response.body.error).toContain("durationSeconds must be at least 60 seconds");
+      expect(response.body.details).toEqual(
+        expect.arrayContaining([
+          expect.objectContaining({ field: "durationSeconds" }),
+        ]),
+      );
+    });
+
+    it("returns 201 when durationSeconds is exactly 60 (minimum boundary)", async () => {
+      const response = await request(app)
+        .post("/api/streams")
+        .set("Authorization", "Bearer mock_token")
+        .send({
+          sender: SENDER_A,
+          recipient: RECIPIENT_1,
+          assetCode: "USDC",
+          totalAmount: 100,
+          durationSeconds: 60,
+        });
+
+      expect(response.status).toBe(201);
+      expect(response.body.data).toMatchObject({
+        durationSeconds: 60,
+      });
+    });
+  });
+
+  describe("Amount precision boundary tests", () => {
+    it("returns 201 when totalAmount is 0.0000001 (1 stroop - minimum valid)", async () => {
+      const response = await request(app)
+        .post("/api/streams")
+        .set("Authorization", "Bearer mock_token")
+        .send({
+          sender: SENDER_A,
+          recipient: RECIPIENT_1,
+          assetCode: "USDC",
+          totalAmount: 0.0000001,
+          durationSeconds: 120,
+        });
+
+      expect(response.status).toBe(201);
+      expect(response.body.data).toMatchObject({
+        totalAmount: 0.0000001,
+      });
+    });
+
+    it("returns 400 when totalAmount is 0", async () => {
+      const response = await request(app)
+        .post("/api/streams")
+        .set("Authorization", "Bearer mock_token")
+        .send({
+          sender: SENDER_A,
+          recipient: RECIPIENT_1,
+          assetCode: "USDC",
+          totalAmount: 0,
+          durationSeconds: 120,
+        });
+
+      expect(response.status).toBe(400);
+      expect(response.body.code).toBe("VALIDATION_ERROR");
+      expect(response.body.error).toContain("Amount must be greater than zero");
+      expect(response.body.details).toEqual(
+        expect.arrayContaining([
+          expect.objectContaining({ field: "totalAmount" }),
+        ]),
+      );
+    });
+
+    it("returns 400 when totalAmount has more than 7 decimal places", async () => {
+      const response = await request(app)
+        .post("/api/streams")
+        .set("Authorization", "Bearer mock_token")
+        .send({
+          sender: SENDER_A,
+          recipient: RECIPIENT_1,
+          assetCode: "USDC",
+          totalAmount: 100.12345678, // 8 decimal places
+          durationSeconds: 120,
+        });
+
+      expect(response.status).toBe(400);
+      expect(response.body.code).toBe("VALIDATION_ERROR");
+      expect(response.body.error).toContain("Amount cannot have more than 7 decimal places");
+      expect(response.body.details).toEqual(
+        expect.arrayContaining([
+          expect.objectContaining({ field: "totalAmount" }),
+        ]),
+      );
+    });
+
+    it("returns 201 when totalAmount has exactly 7 decimal places", async () => {
+      const response = await request(app)
+        .post("/api/streams")
+        .set("Authorization", "Bearer mock_token")
+        .send({
+          sender: SENDER_A,
+          recipient: RECIPIENT_1,
+          assetCode: "USDC",
+          totalAmount: 100.1234567, // exactly 7 decimal places
+          durationSeconds: 120,
+        });
+
+      expect(response.status).toBe(201);
+      expect(response.body.data).toMatchObject({
+        totalAmount: 100.1234567,
+      });
+    });
+  });
 });
 
 // ---------------------------------------------------------------------------