FAQ
Frequently Asked Questions
Service
Pricing
Technology
Others
What is a DApp Service?
A DApp Service defines and manages APIs and resources that are needed to implement various features using contracts, tokens and more on the blockchain in a specific application (web/mobile/desktop application, etc.). For more information on how to use this service, go to [User Guide > Using Luniverse]
What is the User Management Service?
User Management Service is a service for the management of end users of DApps. It includes Wallet Bridge that enables end users to link and use a wallet, Luniverse PKMS that manages end users’ keys, and Account Bridge that offers more convenient end user management. For more information on how to use this service, go to [User Guide > Using User Management Service].
What is a Token Service?
Token Service refers to all services related to tokens in Luniverse such as minting and managing Main Tokens and Side Tokens with ease through GUI. For more information on how to use this service, go to [User Guide > Using Luniverse].
What is a Chain Service?
Chain Service refers to all services related to Side Chains in Luniverse such as creating and managing a Side Chain and uploading and managing contracts on the Side Chain. For more information on how to use this service, go to [User Guide > Using Luniverse].
What is BaaS? How does Luniverse’s BaaS differ from other BaaS?
BaaS stands for “Blockchain as a Service” and refers to SaaS (Software as a Service) that enables users to use the infrastructure and technology of the blockchain in the form of a cloud-based service. Luniverse provides BaaS2.0, the next generation BaaS that offers various blockchain environments and services, such as Chain, Token, DApp, and User Management, required for the planning, development, and operation of DApps as a cloud-based service, which is different from BaaS1.0 that only provided a simple private chain infrastructure. Using Luniverse, DApp developers are now able to develop and operate DApps more easily and safely and also provide DApp services in a user-friendly environment for more users by offering end users a UX similar to the typical web/app environment.
What services are provided in Luniverse plans and what’s the difference between plans?
Luniverse plans offer Chain Service, Token Service, DApp Service, and User Management Service. The same services are provided in all plans, but the chain specifications vary depending on the plan. We recommend choosing plans that consider the characteristics of the services as explained below.
- Dev Plan
- Suitable for building a development environment for blockchain DApps, B2B services with lower traffic, or early-stage services.
- Service Plan
- Suitable for building and operating a general blockchain DApp service.
- Premium Plan
- Suitable for building and operating a blockchain DApp service with higher traffic and increased activity such as games. The plan selected for the chain can be conveniently upgraded as necessary. (The chain upgrade feature will be supported soon.)
How many Side Chains can I create? (+ Main Token, DApp)
There is no limit to how many Side Chains you can create. Simply create as many chains as you need and you will be charged for the number of the created chains based on the plans and usage time. For example, if you’re using two chains via Dev Plan and one chain via Service Plan, the amount you will be charged is [the usage time on Dev Plan 1 * 2,200 Korea won + the usage time on Dev Plan 2 * 2,200 Korean won + the usage time on Service Plan 1 * 4,400 Korean won].
How many Side Tokens and DApps can I create?
There is no limit to the number of Side Tokens and DApps you can create. Simply create and use as many of them as you want on the Side Chain.
How many REOAs and IP Whitelists are available in DApp Service?
You can use up to 3 REOAs and 10 IP Whitelists per DApp.
Can I link and use several MTs on one Side Chain?
Only one MT can be linked and used on each Side Chain. In addition, only one Side Chain can be linked and used with each MT.
What are the components of a Side Chain?
A Side Chain consists of two Validator Nodes and one Monitoring Node. You can create and use as many nodes as you want for the purpose of maintaining governance, enhancing stability, etc., and more features such as governance of the Side Chain will be additionally developed and introduced in order. (The feature to create nodes will be updated soon.)
What is the Gas Delegation Contract?
Luniverse supports a delegation contract to help various participants in the Side Chain manage their balance more conveniently for all gases they need to pay for by using the Main Chain. The Organization Owner may recharge all gases required for the operation of the Side Chain by recharging LUK in the Gas Delegation Contract of the Side Chain. Fees for the gases used by the members of the organization will be paid through the delegation contract. The Organization Owner may recharge all gases required for the operation of the Side Chain by recharging LUK in the Gas Delegation Contract.
I want to deploy a smart contract on the Luniverse Side Chain. What language should I use?
Currently, up to Solidity v5.0 is supported in the Luniverse Side Chain. Solidity v5.1 or later versions are temporarily unavailable. Please deploy a smart contract created in Solidity v5.0 or earlier versions.
What payment methods are available in Luniverse?
You can register credits cards for regular payment in Luniverse. Sign up for Luniverse, register your organization, and register the credit card that will be used for regular payments. Payments will be automatically processed on the 10th of the following month. Please check the limit and balance of the registered credit card for the successful payment process. If your payment is not completed, operation of the chain may be suspended in accordance with the Terms and Conditions.
Which credit cards can I use to pay for Luniverse paid services?
There are 7 credit card brands that can be registered for automatic payment: KB Kookmin Card, Shinhan Card, Lotte Card, BC Card (including Woori and IBK), Samsung Card, Hyundai Card, and NH Nonghyup Card. (KEB Hana Card is currently not supported.
What are the rates of Luniverse services?
Luniverse supports a pay-per-use model that applies ab hourly rate depending on the plan you choose. For User Management Service, a basic free usage will be offered depending on the plan, and you will be additionally charged per 1,000 uses when exceeding the free usage limit. For more information on the rate, go to [Home > Pricing].
What is the difference between LMT and LST?
Luniverse provides a Layer 2 System divided into the main chain and sidechain to prevent the TPS from slowing down due to overload of the chain from transactions.
LMT is an abbreviation of Luniverse Main Token, which refers to a token issued (Mint) in the main chain through a contract. LMT is a token that can be transferred externally (exchange, external wallet, etc.) and listed on the exchange.
On the other hand, LST is an abbreviation of Luniverse Side Token and refers to a token issued (Mint) from the Side Chain. LST is a token that can be used without a separate gas fee within the service.
What is a dedicated sidechain?
Luniverse provides a Layer 2 System divided into Main Chain and Side Chain to prevent the TPS from slowing down due to overload of the chain from transactions.
Free Trial and Starter plan are a form in which multiple users share one side chain, and Dev Plan, Service Plan, and Premium Plan can use a separate dedicated side chain granted to each customer.
How can I recharge LUK and what are the fees?
Log in to Console – Click ID on the top right (My Luniverse) – Manage Chain – Click Fuel LUK at the bottom of the page to recharge.
When you top up your LUK through the console, it will be automatically charged to your invoice for the month.
The LUK price is calculated using the exchange rate on the 1st of each month as 1 LUK = 0.01 USD. (VAT excluded)
Should a DApp have only a single sidechain? If your business expands after creating a sidechain, is there a way to use the existing sidechain?
One DApp is designed to be operated in only one Sidechain. Conversely, multiple DApps can be operated on one sidechain. However, we recommend that you open a new sidechain if you additionally open a Dapp with a very different business nature.
What is the maximum length that can be stored for string type when writing in Solidity code?
For transactions executed through Transaction Service, the limit is 3.2 million Gas. It is difficult to guide the exact maximum length as gas is measured differently depending on the code logic when storing and reading a value in a variable. It is recommended to check the gas consumed through the receipt inquiry and apply a Soft Limit to the length in the contract code.
Are there no transaction fees on the sidechain?
There are no gas fees incurred in transactions on the sidechain.
I'd like to use a method that is not supported in the Side Token by making it a Transaction. What should I do?
If there is an additional required method, you can add the method and write the contract directly, then deploy it as a user contract and use it. You can deploy the contract by clicking the chain you want to deploy the contract to in the console > Click User contract in the side menu of the chain.
How can I exchange the Side Token back to the Main Token after generating it?
After creating a side token, use Redeem transaction in Dapp -> transaction management menu to convert to main token. You must inquire separately for the main token API.
Can I delete a DApp?
Currently, we are preparing the function to delete DApp after creation. However, since there is no limit on the number of DApps, you can create additional DApps.
I want to create two side tokens and create a transaction that exchanges the two tokens at a certain rate. How can I do it?
You can use it after directly writing and distributing a contract that exchanges side tokens. Take a look at the contract code attached below.
https://github.com/bokkypoobah/TokenTrader/blob/master/contracts/TokenTraderFactory.sol
What kind of information is periodically registered in the Main Chain when anchoring is in progress?
You can use it after directly writing and distributing a contract that exchanges side tokens. Take a look at the contract code attached below.
https://github.com/bokkypoobah/TokenTrader/blob/master/contracts/TokenTraderFactory.sol
Is it possible to add and delete validator nodes in addition to the 3 nodes created during chain configuration?
In the case of Validator nodes, three are required for initial registration. There are plans to add, delete, and change nodes, but they have not been implemented yet. However, even if the function is implemented, there will be restrictions in dynamically adding and deleting because voting of other validators is required even in the geth stage when replacing validators.
txId is used to obtain txHash value. Does the GET /tx/histories/:txId API used at this time return the result right away?
In Tx History, txHash is issued after an execution request is made for a transaction, so there may be no txHash immediately after the Tx execution API call.
When a public key is generated with the Wallet API, an address is generated and returned. Is it possible to check these lists in the console of the DApp creator?
The API provided as a document is the Tx API document. Currently, the console does not provide a separate list of EOAs created with the Tx API. The REOA created in the console is an EOA created through the BE API, and the list is provided only in the console.
When using the wallet bridge, if the front application calls the API directly, do I have to expose the API key and register the IP in the whitelist?
TxAPI, which is provided based on DApp IP Whitelist, is premised on communicating with DApp Back-end Server. The DApp API Key should not be exposed to the Front Application. You need to implement it so that you can call Luniverse TxAPI through the DApp Back-end Server.
Is the REOA created in the console different from the REOA created using the Transaction Service's Wallet API?
REOA is Luniverse’s EOA that manages private keys. Although the REOA created in the console and the REOA created through the Wallet API have the same form, it is recommended to use the REOA created in the console as the DApp administrator’s EOA and the REOA created through the Wallet API as the end user’s EOA.
Is the Tx API used for a Transaction Service in the console mandatory to use IP Whitelist? Is the REOA created using the Transaction Service Wallet API different from the REOA created?
Tx API is assumed to be called by the DApp Backend server. Therefore, the IP address of the DApp Backend server can be registered and used through the IP Whitelist management menu. Also, we check the permission of the DApp based on the DApp API Key.
If there are existing ERC-20 tokens issued, is it possible to transfer them to the Luniverse platform?
1. Snapshot method
2. Collection after issuance of virtual account is possible in two ways.
Details on the procedure can be found in the User Guide.
How can I get a transaction receipt?
Only transactions executed through Tx API of Transaction Service can inquire Receipt with Tx API. Please refer to the Receipt section of https://apidocs.luniverse.io/tx-api.
Can I check Luniverse's blockchain source code?
You can view the related source code here on Github. https://github.com/Lambda256/luniverse-poa
Can I check the Luniverse token protocol source code?
You can view the related source code here on Github. https://github.com/Lambda256/luniverse-token-protocol
Where can I get help for the question on using Luniverse for developments?
The information on how to use the Luniverse Console can be found in [User Guide], and API documents, which are available in the [API Document]. If you have inquiries about using services or comments for improvement, please send an e-mail to support@luniverse.io. Your inquiries and comments will be promptly reviewed and action taken.
Where can I find the SLA(Service Level Agreement)?
Luniverse SLA is available at the bottom of the Terms and Conditions.
I want to see more improvements in the features provided by Luniverse. Where can I send comments for improvement?
If you have inquiries about using Luniverse or comments for improvement, please send an e-mail to support@luniverse.io. Your inquiries and comments will be promptly reviewed and action taken.