diff --git a/aleph_scoring/__main__.py b/aleph_scoring/__main__.py
index d361bd8..003a941 100644
--- a/aleph_scoring/__main__.py
+++ b/aleph_scoring/__main__.py
@@ -11,7 +11,7 @@
 import sentry_sdk
 import typer
 from aleph.sdk.chains.ethereum import ETHAccount
-from aleph.sdk.client import AuthenticatedAlephClient
+from aleph.sdk.client import AuthenticatedAlephHttpClient
 from aleph.sdk.types import Account
 from hexbytes import HexBytes
 
@@ -49,7 +49,7 @@ async def publish_metrics_on_aleph(account: Account, node_metrics: NodeMetrics):
     aleph_api_server = settings.NODE_DATA_HOST
 
     metrics_post_data = MetricsPost(tags=["mainnet"], metrics=node_metrics)
-    async with AuthenticatedAlephClient(
+    async with AuthenticatedAlephHttpClient(
         account=account, api_server=aleph_api_server
     ) as client:
         metrics_post, status = await client.create_post(
@@ -78,7 +78,7 @@ async def publish_scores_on_aleph(
     # Force datetime conversion to string
     post_content["period"] = json.loads(period.json())
 
-    async with AuthenticatedAlephClient(
+    async with AuthenticatedAlephHttpClient(
         account=account, api_server=aleph_api_server
     ) as client:
         scores_post, status = await client.create_post(
diff --git a/aleph_scoring/metrics/__init__.py b/aleph_scoring/metrics/__init__.py
index 0898927..632a14c 100644
--- a/aleph_scoring/metrics/__init__.py
+++ b/aleph_scoring/metrics/__init__.py
@@ -28,7 +28,7 @@
 import aiohttp
 import async_timeout
 import pyasn
-from aleph.sdk import AlephClient
+from aleph.sdk import AlephHttpClient
 from pydantic import BaseModel, validator
 from urllib3.util import Url, parse_url
 
@@ -56,7 +56,12 @@
     "67705389842a0a1b95eaa408b009741027964edc805997475e95c505d642edd8"
 )
 
+VRF_VM_HASH = (
+    "f6a734dbc98659f030e1cd9c12d8ffb769deac55d42d5db5285fba099755c779"
+)
+
 CRN_DIAGNOSTIC_VM_PATH = "{url}vm/" + CRN_DIAGNOSTIC_VM_HASH
+VRF_VM_PATH = "{url}vm/" + VRF_VM_HASH
 IP4_SERVICE_URL = "https://v4.ident.me/"
 
 
@@ -469,6 +474,14 @@ async def get_crn_metrics(
             )
         )[0]
 
+        vrf_vm_latency = (
+            await measure_http_latency(
+                session,
+                "".join(VRF_VM_PATH).format(url=url),
+                timeout_seconds=10,
+            )
+        )[0]
+
     async with aiohttp.ClientSession(
         timeout=timeout_generator(),
         connector=aiohttp.TCPConnector(
@@ -502,6 +515,7 @@ async def get_crn_metrics(
         diagnostic_vm_latency=diagnostic_vm_latency,
         full_check_latency=full_check_latency,
         vm_ping_latency=vm_ping_latency,
+        vrf_latency=vrf_vm_latency,
     )
 
 
@@ -538,11 +552,10 @@ async def collect_all_crn_metrics(node_data: Dict[str, Any]) -> Sequence[CrnMetr
 
 
 async def get_aleph_nodes() -> Dict:
-    async with AlephClient(api_server=settings.NODE_DATA_HOST) as client:
+    async with AlephHttpClient(api_server=settings.NODE_DATA_HOST) as client:
         return await client.fetch_aggregate(
             address=settings.NODE_DATA_ADDR,
             key="corechannel",
-            limit=50,
         )
 
 
diff --git a/aleph_scoring/metrics/models.py b/aleph_scoring/metrics/models.py
index c408358..fbe1700 100644
--- a/aleph_scoring/metrics/models.py
+++ b/aleph_scoring/metrics/models.py
@@ -28,6 +28,7 @@ class CrnMetrics(AlephNodeMetrics):
     diagnostic_vm_latency: Optional[float]
     full_check_latency: Optional[float]
     vm_ping_latency: Optional[float] = None
+    vrf_latency: Optional[float] = None
 
 
 class NodeMetrics(BaseModel):