diff --git a/CHANGES.md b/CHANGES.md
index 361ed98..37dea77 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,10 @@
 # Release Notes
 
+## Unrelease
+
+* add `pgstac_dependency` attribute in `MosaicTilerFactory` (defaults to `dependencies.PgSTACParams`)
+* add database's `pool` check in startup event
+
 ## 0.8.0 (2023-10-06)
 
 * update titiler requirement to `>=0.14.0,<0.15`
diff --git a/titiler/pgstac/db.py b/titiler/pgstac/db.py
index 7c2da14..8566d91 100644
--- a/titiler/pgstac/db.py
+++ b/titiler/pgstac/db.py
@@ -25,6 +25,10 @@ async def connect_to_db(
         kwargs={"options": "-c search_path=pgstac,public -c application_name=pgstac"},
     )
 
+    # Make sure the pool is ready
+    # ref: https://www.psycopg.org/psycopg3/docs/advanced/pool.html#pool-startup-check
+    app.state.dbpool.wait()
+
 
 async def close_db_connection(app: FastAPI) -> None:
     """Close Pool."""
diff --git a/titiler/pgstac/factory.py b/titiler/pgstac/factory.py
index 423aac7..815beec 100644
--- a/titiler/pgstac/factory.py
+++ b/titiler/pgstac/factory.py
@@ -112,6 +112,7 @@ class MosaicTilerFactory(BaseTilerFactory):
 
     pixel_selection_dependency: Callable[..., MosaicMethodBase] = PixelSelectionParams
 
+    pgstac_dependency: Type[DefaultDependency] = PgSTACParams
     backend_dependency: Type[DefaultDependency] = BackendParams
 
     # Add/Remove some endpoints
@@ -217,7 +218,7 @@ def tile(
             color_formula=Depends(ColorFormulaParams),
             colormap=Depends(self.colormap_dependency),
             render_params=Depends(self.render_dependency),
-            pgstac_params: PgSTACParams = Depends(),
+            pgstac_params=Depends(self.pgstac_dependency),
             backend_params=Depends(self.backend_dependency),
             reader_params=Depends(self.reader_dependency),
             env=Depends(self.environment_dependency),
@@ -329,7 +330,7 @@ def tilejson(
             color_formula=Depends(ColorFormulaParams),
             colormap=Depends(self.colormap_dependency),
             render_params=Depends(self.render_dependency),
-            pgstac_params: PgSTACParams = Depends(),
+            pgstac_params=Depends(self.pgstac_dependency),
             backend_params=Depends(self.backend_dependency),
             reader_params=Depends(self.reader_dependency),
         ):
@@ -431,7 +432,7 @@ def map_viewer(
             color_formula=Depends(ColorFormulaParams),
             colormap=Depends(self.colormap_dependency),
             render_params=Depends(self.render_dependency),
-            pgstac_params: PgSTACParams = Depends(),
+            pgstac_params=Depends(self.pgstac_dependency),
             backend_params=Depends(self.backend_dependency),
             reader_params=Depends(self.reader_dependency),
             env=Depends(self.environment_dependency),
@@ -523,7 +524,7 @@ def wmts(
                 self.rescale_dependency,
                 self.colormap_dependency,
                 self.render_dependency,
-                PgSTACParams,
+                self.pgstac_dependency,
                 self.reader_dependency,
                 self.backend_dependency,
             ]
@@ -639,7 +640,7 @@ def assets_for_tile(
                 Literal[tuple(self.supported_tms.list())],
                 f"Identifier selecting one of the TileMatrixSetId supported (default: '{self.default_tms}')",
             ] = self.default_tms,
-            pgstac_params: PgSTACParams = Depends(),
+            pgstac_params=Depends(self.pgstac_dependency),
             backend_params=Depends(self.backend_dependency),
             reader_params=Depends(self.reader_dependency),
         ):
@@ -663,7 +664,7 @@ def assets_for_point(
             lat: Annotated[float, Path(description="Latitude")],
             searchid=Depends(self.path_dependency),
             coord_crs=Depends(CoordCRSParams),
-            pgstac_params: PgSTACParams = Depends(),
+            pgstac_params=Depends(self.pgstac_dependency),
             backend_params=Depends(self.backend_dependency),
             reader_params=Depends(self.reader_dependency),
         ):
@@ -754,7 +755,7 @@ def register_search(
                     self.rescale_dependency,
                     self.colormap_dependency,
                     self.render_dependency,
-                    PgSTACParams,
+                    self.pgstac_dependency,
                     self.reader_dependency,
                     self.backend_dependency,
                 ]
@@ -1057,7 +1058,7 @@ def geojson_statistics(
             pixel_selection=Depends(self.pixel_selection_dependency),
             stats_params=Depends(self.stats_dependency),
             histogram_params=Depends(self.histogram_dependency),
-            pgstac_params: PgSTACParams = Depends(),
+            pgstac_params=Depends(self.pgstac_dependency),
             backend_params=Depends(self.backend_dependency),
             reader_params=Depends(self.reader_dependency),
             env=Depends(self.environment_dependency),
@@ -1137,7 +1138,7 @@ def bbox_image(
             color_formula=Depends(ColorFormulaParams),
             colormap=Depends(self.colormap_dependency),
             render_params=Depends(self.render_dependency),
-            pgstac_params: PgSTACParams = Depends(),
+            pgstac_params=Depends(self.pgstac_dependency),
             backend_params=Depends(self.backend_dependency),
             reader_params=Depends(self.reader_dependency),
             env=Depends(self.environment_dependency),
@@ -1212,7 +1213,7 @@ def feature_image(
             color_formula=Depends(ColorFormulaParams),
             colormap=Depends(self.colormap_dependency),
             render_params=Depends(self.render_dependency),
-            pgstac_params: PgSTACParams = Depends(),
+            pgstac_params=Depends(self.pgstac_dependency),
             backend_params=Depends(self.backend_dependency),
             reader_params=Depends(self.reader_dependency),
             env=Depends(self.environment_dependency),