[General] Question regarding the faucet requirements of deploying a rollup

[zaguezzar]

Team or Project

Proviroll

ZK chain

Era

Environment

Sepolia

L2 block number

Genesis

Provide a brief description of the functionality you're trying to implement and the issue you are running into.

I've tried more than 20 rollup deployments on the Sepolia testnet, and I notice that the deployment costs are highly variable despite the parameters being the same. Sometimes the whole process takes less than 1 ETH from the deployer wallet, sometimes it takes 5 or 6 ETH at very early stages of the deployment (which ultimately fails it at the ecosystem initialization stage because of the balance being lower than 5 ETH despite using the --ignore-prerequisites flag on the zkstack ecosystem init command). I'd like to know how to handle this variance or to completely ignore the 5ETH condition during contract deployments since it causes them to fail. Thank you.

Repo Link (Optional)

No response

Additional Details

I provision my wallets, giving them 6ETH each except for the deployer that gets 9.

[MexicanAce]

Hi @zaguezzar , can you clarify what you mean by the faucet account? I'm unsure which deployment docs you're looking at, but I can ask around to see if there's something I'm missing.

[zaguezzar]

Hey @MexicanAce, thanks for your answer. To init and run a rollup I believe I need an account with enough ETH to feed a few accounts (deployer, operator, governor etc.) for the smart contract deployments, isn't that the case? If so, I'd like to know the amount needed for each of these accounts.

[MexicanAce]

I think it would depend on the type of Rollup you want to run (ex: Is it a Validium?). One way to get an idea for the cost is to run the rollup locally by following the Getting started with ZK Stack guide.

[uF4No]

As @MexicanAce mentioned, it hard to estimate as also gas on testnet fluctuates a lot but, on Sepolia, to create you own ecosystem on L1 and then deploy your own ZK chain and deploy and fund all the system contracts etc.. 5ETH will be enough for sure. Hope that helps 🤙

[zaguezzar]

Hey @MexicanAce @uF4No, sorry for the belated reply and thank you for your answers. I've successfully followed the guide and granted each wallet 5.2 sepoliaETH, and managed to run the rollup chain after creating and initializing the ecosystem. However when I take a look at the wallets, I see that not much sepoliaETH was used:

Role	Address	Initial Balance (ETH)	Final Balance (ETH)	Consumed (ETH)
Deployer	0x54A0f51D5245b6C7FEf5E6F7262649944b5df286	5.27	5.040508021414579758	0.22949198
Operator	0x67087CD089dE735be7438C323c2236D4E6982Ca3	5.20	5.200000000000000000	0.00000000
Blob Operator	0x6b223fb9A1D46aD3AdE659934539Ae425c76B368	5.20	5.197922532931332319	0.00207747
Fee Account	0xa907bD599A0Bb80aFc7504Fe8CffDa4b62C7f0d1	5.20	5.200000000000000000	0.00000000
Governor	0xE26B56958A092653FD2102d311dfa19f8571B69c	5.20	5.001256023708322687	0.19874398
Token Multiplier Setter	0x7545289E2DF41e937F62c8054D6e7b2642f46fB2	5.20	5.200000000000000000	0.00000000

Total ETH Consumed:

0.22949198 + 0.00207747 + 0.19874398 = 0.43031343 ETH

Observations:

• We're being asked for 5 sepoliaETH per wallet but only 0.43 was used in total.
• The main accounts used are the deployer, blob operator and governor.

Questions:

• Why do we need 5 sepoliaETH per wallet for a total of 30, if hardly 1 ETH of gas fees was used?
• Should we expect the same amounts and behavior during a mainnet deployment?

[dutterbutter]

Hey @zaguezzar

This is a fantastic post, and really appreciate the time spent here.

You are absolutely right that the required amount of 5 ETH is a bit excessive. Let me talk with the platform team on reducing that amount so its less of a barrier for devs testing zkstack-cli out. The 5 ETH amount was initially in place just to always ensure enough ETH is funded but its too high in my opinion as well!

Thanks again for the post ❤️

[zaguezzar]

Hello again @dutterbutter @uF4No,

I've tried more than 20 rollup deployments on the Sepolia testnet, and I notice that the deployment costs are highly variable despite the parameters being the same. Sometimes the whole process takes less than 1 ETH from the deployer wallet, sometimes it takes 5 or 6 ETH at very early stages of the deployment (which ultimately fails it at the ecosystem initialization stage because of the balance being lower than 5 ETH despite using the --ignore-prerequisites flag on the zkstack ecosystem init command).

As a side note, I give the deployer wallet 8.5 ETH/9 ETH just to avoid problems, but they still occur at times.

Any pointers or clues about this variance or how I can pretty much ignore/solve this balance issue during ecosystem initialization? Let me know if my question is unclear and thank you very much for your kind assistance. ❤️

[dutterbutter]

@zaguezzar I see you've unanswered this post, the responses provided are accurate. Gas prices fluctuate so its not as if we can provide an exact number, however if using zkstack-cli the required amount for accounts to deploy the necessary contracts is 5 ETH. Important to note there are multiple accounts during deployment (e.g. deployer, governor etc), these expect to be properly funded as well.

I suggest deploying locally first, then testnet, then mainnet. You will get a very close approximation.

Hopefully that sufficiently answers your question 🙏

[zaguezzar]

Sorry I unanswered it while preparing a reply.

[uF4No]

I'm putting your post with the cost analysis as the answer as it provides very useful and accurate info. Thanks for that @zaguezzar