Index: /applications/editors/josm/plugins/cadastre-fr/src/org/openstreetmap/josm/plugins/fr/cadastre/api/CadastreAPI.java
===================================================================
--- /applications/editors/josm/plugins/cadastre-fr/src/org/openstreetmap/josm/plugins/fr/cadastre/api/CadastreAPI.java	(revision 34351)
+++ /applications/editors/josm/plugins/cadastre-fr/src/org/openstreetmap/josm/plugins/fr/cadastre/api/CadastreAPI.java	(revision 34351)
@@ -0,0 +1,58 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.plugins.fr.cadastre.api;
+
+import java.io.IOException;
+import java.io.StringReader;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+import javax.json.Json;
+
+import org.openstreetmap.josm.data.Bounds;
+import org.openstreetmap.josm.tools.HttpClient;
+import org.openstreetmap.josm.tools.JosmRuntimeException;
+
+/**
+ * Interface to Cadastre GeoAPI.
+ */
+public final class CadastreAPI {
+
+    private static final String API_ENDPOINT = "https://sandbox.geo.api.gouv.fr/cadastre/";
+
+    private CadastreAPI() {
+        // Hide public sontructor for utility classes
+    }
+
+    /**
+     * Returns the set of cadastral sheet ids for the given bounding box.
+     * @param bounds bounding box
+     * @return the set of cadastral sheet ids for the given bounding box
+     * @throws IOException if any I/O error occurs
+     */
+    public static Set<String> getSheets(Bounds bounds) throws IOException {
+        return getSheets(bounds.getMinLon(), bounds.getMinLat(), bounds.getMaxLon(), bounds.getMaxLat());
+    }
+
+    /**
+     * Returns the set of cadastral sheet ids for the given bounding box.
+     * @param minlon minimum longitude
+     * @param minlat minimum latitude
+     * @param maxlon maximum longitude
+     * @param maxlat maximum latitude
+     * @return the set of cadastral sheet ids for the given bounding box
+     * @throws IOException if any I/O error occurs
+     */
+    public static Set<String> getSheets(double minlon, double minlat, double maxlon, double maxlat) throws IOException {
+        try {
+            return Json.createReader(new StringReader(
+                    HttpClient.create(new URL(API_ENDPOINT + "/feuilles?bbox=" + String.join(",",
+                            Double.toString(minlon), Double.toString(minlat), Double.toString(maxlon), Double.toString(maxlat))))
+                    .connect().fetchContent()))
+                    .readArray().stream().map(x -> x.asJsonObject().getString("id")).collect(Collectors.toSet());
+        } catch (MalformedURLException e) {
+            throw new JosmRuntimeException(e);
+        }
+    }
+}