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diff --git a/services/api/app/main.py b/services/api/app/main.py
index 27c585d..5a61892 100644
--- a/services/api/app/main.py
+++ b/services/api/app/main.py
@@ -1,4 +1,6 @@
 from fastapi import FastAPI
+from fastapi.openapi.docs import get_swagger_ui_html, get_redoc_html
+from fastapi.responses import HTMLResponse
 
 from services.api.app.models import CheckTransactionRequest, CheckTransactionResponse
 from services.intelligence.sentinel_risk.engine import (
@@ -11,7 +13,12 @@
 
 POLICY_VERSION = "day13-v3"
 
-app = FastAPI(title="SentinelAI API", version="0.1.0")
+app = FastAPI(
+    title="SentinelAI API",
+    version="0.1.0",
+    docs_url=None,  # Disable default docs to use custom ones with Speed Insights
+    redoc_url=None,  # Disable default redoc to use custom ones with Speed Insights
+)
 
 
 @app.get("/health", tags=["system"])
@@ -50,3 +57,56 @@ def check_transaction(request: CheckTransactionRequest) -> CheckTransactionRespo
         decision=decision.value,
         policy_version=POLICY_VERSION,
     )
+
+
+@app.get("/docs", include_in_schema=False)
+async def custom_swagger_ui_html() -> HTMLResponse:
+    """
+    Custom Swagger UI with Vercel Speed Insights integration.
+    """
+    html = get_swagger_ui_html(
+        openapi_url=app.openapi_url or "/openapi.json",
+        title=f"{app.title} - Swagger UI",
+        swagger_js_url="https://cdn.jsdelivr.net/npm/swagger-ui-dist@5.9.0/swagger-ui-bundle.js",
+        swagger_css_url="https://cdn.jsdelivr.net/npm/swagger-ui-dist@5.9.0/swagger-ui.css",
+        swagger_favicon_url="https://fastapi.tiangolo.com/img/favicon.png",
+        # Inject Vercel Speed Insights script
+        swagger_ui_parameters={
+            "persistAuthorization": True,
+        },
+    )
+    # Inject Speed Insights script into the HTML
+    html_content = html.body.decode()
+    html_content = html_content.replace(
+        "</head>",
+        """<script>
+  window.si = window.si || function () { (window.siq = window.siq || []).push(arguments); };
+</script>
+<script defer src="/_vercel/speed-insights/script.js"></script>
+</head>""",
+    )
+    return HTMLResponse(content=html_content)
+
+
+@app.get("/redoc", include_in_schema=False)
+async def custom_redoc_html() -> HTMLResponse:
+    """
+    Custom ReDoc with Vercel Speed Insights integration.
+    """
+    html = get_redoc_html(
+        openapi_url=app.openapi_url or "/openapi.json",
+        title=f"{app.title} - ReDoc",
+        redoc_js_url="https://cdn.jsdelivr.net/npm/redoc@next/bundles/redoc.standalone.js",
+        redoc_favicon_url="https://fastapi.tiangolo.com/img/favicon.png",
+    )
+    # Inject Speed Insights script into the HTML
+    html_content = html.body.decode()
+    html_content = html_content.replace(
+        "</head>",
+        """<script>
+  window.si = window.si || function () { (window.siq = window.siq || []).push(arguments); };
+</script>
+<script defer src="/_vercel/speed-insights/script.js"></script>
+</head>""",
+    )
+    return HTMLResponse(content=html_content)