How to listen to every new block

[shivam2320]

I want to write a program which does some stuff on every new block
How can I listen to every new block

[heliuchuan]

To get the latest block you can use the type script SDK

aptos.getLedgerInfo()

will give you something like

  {
     "chain_id": 4,
     "epoch": "8",
     "ledger_version": "714",
     "oldest_ledger_version": "0",
     "ledger_timestamp": "1694695496521775",
     "node_role": "validator",
     "oldest_block_height": "0",
     "block_height": "359",
     "git_hash": "c82193f36f4e185fed9f68c4ad21f6c6dd390c6e"
    }

you can use that to get the latest block and query it via aptos.getBlockByHeight({ blockHeight: number })

Right now the SDK doesn't have any built in functionality to listen to new blocks, but you can write your own polling to do so.

[kaouki99]

You can connect via gRPC to stream the transactions https://aptos.dev/indexer/txn-stream/

[heliuchuan]

ah yes