curl --request POST \
  --url https://api.mainnet.abs.xyz/zks_L1BatchNumber \
  --header 'Content-Type: application/json' \
  --data '{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "zks_L1BatchNumber",
  "params": []
}'

{
  "jsonrpc": "2.0",
  "result": "0x2b13",
  "id": 1
}