Yes you can! you'll just need to enable the rpc.enable-indexing: true in the node's yaml config before startup.

Also note that these apis are pre-stable but will become stabilized over the next few months. See https://docs.sui.io/guides/developer/getting-started/data-serving#grpc-api for more details on the timeline

Quick Fixes

1. Use Correct gRPC Method:
   The ListOwnedObjects method is deprecated. Switch to:

   grpcurl -d '{"owner": "0x..."}' fullnode.testnet.sui.io:443 sui.rpc.v2.Read/GetOwnedObjects
   

2. Enable gRPC on Your Node:
   Add to fullnode.yaml:

   grpc:
     enabled: true
     port: 9001
   

3. Check Node Sync:

   curl -s http://localhost:9184/metrics | grep "checkpoint_height"
   

Why This Happens

• v2alpha is outdated (use v2 or v1)
• Your node might not expose gRPC by default

Working Example

grpcurl -plaintext -d '{"owner": "0x..."}' localhost:9001 sui.rpc.v2.Read/GetOwnedObjects

Root Cause

• The v2alpha endpoint is deprecated
• Newer nodes disable it by default

Fix (Use Current API)

# Use the stable v2 endpoint instead:
grpcurl -plaintext -d '{
  "owner": "0xc75ff8f7215e3dc9671ae2ef85c519414b886bff4e0f6edb5ff7b8d3d9e648fa"
}' fullnode.testnet.sui.io:443 sui.rpc.v2.Read/GetOwnedObjects

If Still Needed (Legacy Support)

1. Enable v2alpha in fullnode.yaml:

   grpc:
     enabled-legacy-methods: true
   

2. Restart node:

   sudo systemctl restart sui-node