Add pairlist "is-generator" to api

freqtrade/rpc/api_server/api_v1.py

@@ -310,6 +310,7 @@ def list_pairlists(config=Depends(get_config)):
 
     return {'pairlists': [{
         "name": x['name'],
+        "is_pairlist_generator": x['class'].is_pairlist_generator,
         "params": x['class'].available_parameters(),
          } for x in pairlists
         ]}

tests/rpc/test_rpc_apiserver.py

@@ -1595,6 +1595,13 @@ def test_api_pairlists(botclient, tmpdir, mocker):
     assert len([r for r in response['pairlists'] if r['name'] == 'VolumePairList']) == 1
     assert len([r for r in response['pairlists'] if r['name'] == 'StaticPairList']) == 1
 
+    volumepl = [r for r in response['pairlists'] if r['name'] == 'VolumePairList'][0]
+    assert volumepl['is_pairlist_generator'] is True
+    assert len(volumepl['params']) > 1
+    age_pl = [r for r in response['pairlists'] if r['name'] == 'AgeFilter'][0]
+    assert age_pl['is_pairlist_generator'] is False
+    assert len(volumepl['params']) > 2
+
 
 def test_list_available_pairs(botclient):
     ftbot, client = botclient