Rent Fees On Kusama & Polkadot


not sure if this is the right place for the question but StackExchange doesn’t seem like the right place. I’d like to understand better the values behind Kusama’s and Polkadot’s storage rent fees.

Creating a single DB entry requires a deposit of (ignoring the bytes component):

  • 0.6666…6 KSM on Kusama(code)
  • 20 DOT on Polkadot(code)

(I assume the roughly 2 orders of magnitude diff is due to the redenomination?)

Statemine and Statemint both charge 100x less than their respective relay chains.

The Polkadot tokenomics research document only mentions rent fee but doesn’t go into details on how the practical values were chosen.

I’d like to understand how the used values were chosen? Was it aiming at some specific price tag in USD for the aforementioned KSM/DOT amounts?

Have to reply to myself since I cannot seem to edit the post :slightly_smiling_face:

A good example of a high level overview would be NEAR’s documentation HERE, under the Storage chapter.

If something similar exists for Polkadot/Kusama, it would be great if someone could share it!