state_getKeys
curl -s https://api-acala.n.dwellir.com/YOUR_API_KEY -H 'Content-Type: application/json' -d '{"jsonrpc":"2.0","id":1,"method":"state_getKeys","params":["0x26aa394eea5630e07c48ae0c9558cef7", null]}'
Use state_getKeysPaged
for large scans.