@RooSoft if you're running Bitcoin Core, RPC has the following APIs which appear useful.

* `getmempoolancestors()`

* `getmempooldescendants()`

* `getmempoolentry()`

* `getmempoolinfo()`

* `getrawmempool()`

Note that you can control the size of your local mempool with Bitcoin Core config.

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Also maybe the `getblocktemplate()` api call is useful for your use case?

I agree... but I was specifically talking about https://bitcoindevkit.org

The rust lib doesn't seem to have realtime functions throwing events from nodes