solana-core
curl https://rpc.testnet.soo.network/rpc \ -X POST \ -H "Content-Type: application/json" \ -d '{ "jsonrpc": "2.0", "id": 1, "method": "getHighestSnapshotSlot" }'
{ "jsonrpc": "2.0", "result": { "full": 369624, "incremental": 369623 }, "id": 1 }
full: <u64>
incremental: <u64|null>
null