How long for parameter update to take effect?

Staking & Delegation Operate a Stake Pool
1

With the parameter update of minPoolCost to 170 ADA per epoch that was put on chain 10/23/2023 at 11:23AM, how long until the parameter takes effect? It is currently 10/24/2023 at 5:30PM and when I do:

cardano-cli query protocol-parameters
–mainnet
–out-file $NODE_HOME/params.json

,the params.json file still shows minPoolCost at 340 ADA. I also checked pooltool.io and noticed that no pools have yet to reduce their minPoolCost. Is there a certain amount of time or number of epochs until I will be able to reduce this pool parameter. Thanks in advance.

2

Here is the transaction of the parameter update: Transaction 5f6e2d29176efcc2a595b75cea4b82d766ae9c41b71707f27be5c79bc74c46f4 - Cardanoscan

3

You’ll need to wait until the params output shows the new minPoolCost. Then you’ll be able to submit a new pool cert with your selected minPoolCost. I think it will take 2 epochs to take effect, but not sure really. But it will also then depend on when your pool gets its next block!

4

The two epochs makes sense to me although I don’t understand why my next block would impact updating the pool certificate. Are you implying that the parameter changes will only update after I mint a block?

5

No, just saying the min fee doesn’t mean anything if you don’t mint a block. For a small pool, they might update the pool cert and not mint a block for many epochs. But either way, if you intend to update the min fee, you need to wait until the params reports the new minPoolCost.

6

The change of the “min pool cost”-parameter takes effect on mainnet on October 27th, 21:44:51 UTC.