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Stone Index on Substrate

  • Team Name: stonedefi
  • Payment Address: bc1qwyq4h8q07vjm9gm9mxjk5gew5hr06lk9ca5t0t

Project Overview πŸ“„β€‹


Stone team proposes a STONE INDEX project which aims to track the portfolio of multiple digital assets across different blockchains, the index is designed to mimic the composition and performance of selected digital assets, particularly we are focusing on yield bearing assets (such as liquid staked tokens). As far as our knowledge goes, this is the first index on the Polkadot ecosystem, and yield bearing assets is a new asset type that creates stable rewards for holders. Stone has the vision of building the index defined by yields and expanding the horizon to index derivatives which further add to the asset offering of the Polkadot ecosystem.

The Stone team's vision is to bring solid yield to token holders, while index is a favorite investment option to normal users. There are quite some great index implementations in the Ethereum ecosystem, e.g. Tokensets, Balancer Exchange etc., and the Stone team sees a good opportunity to bring such an efficient crypto asset management instrument into the exciting Polkadot ecosystem.

The index will be built on Substrate and join the coming Polkadot parachain ecosystem in future to increase the range of cross-chain assets to bridge staked assets from other chains to Polkadot.

Thanks to Polkadot's cross-chain protocol makes them the perfect blockchain to build an index of multiple crypto assets. We do see an exponential uptrend of Defi on the Polkadot ecosystem. Such indexes can be used in lending protocols and DEXes for users and traders to build further markets.

Stone Index is a decentralized instrument running on Stone platform (, Stone platform is a yield maximisation protocol and asset aggregation platform of multiple strategies including Ethereum(both 1.0 and 2.0), Polkadot, Solana and so on, Stone Index will be a latest strategy to be added into Stone platform and open to all Stone users

The project will be broken down into multiple phases and we'll focus on the first phase, which is dedicated to liquid staked DOT, e.g. aDOT, bDOT and etc. from various providers, to create iDOT, which combines the total liquidity of the fragmented markets

Project Details​

High level architecture​

Stone index architecture

There are 3 high level components for Stone Index:

  • Stone platform on Substrate(UI/UX and indexed basket management), including WebUI and a set of Substrate pallets
  • One or more parachain on Polkadot for providing liquidity of staking tokens, e.g. aDOT, bDOT
  • One parachain based DEX on Polkadot for Polkadot's interoperability

System flow​

Stone index sys flow

Stone Index essentially is a collateralised asset that allows the community to combine different tokens and form an index basket. Having an indexed basket makes diversified investment easier for the masses.

  • Create an index The creator of the index create a Substrate pallet that defines the composition of the basket. The Stone Team will manage these baskets(aDOT, bDOT and other liquid tokens) and indexes(iDOT) in this proposal.

  • Purchase an index Users can select to purchase from the indexed basket. They can purchase with aDOT, bDOT which would then automatically convert it to the underlying basket composition using DEX.

  • Redeem an index Alternatively if user wants to redeem the underlying index, they can choose to deposit the index token back into the Stone Platform. Subsequently the underlying tokens would be sent back to the user’s wallet.

Use case diagram​

Stone index use case flow

There are 2 types of actors in Stone Index:

  • Admin: The user to manage indexed baskets
  • User: Any user who holds the desired tokens

Runtime module/chain - Indexed basket management module​

Public exposed methods​

// To create an index with 2 tokens and weight per token with an unique name, and return with the newly created index ID
create_index(origin, name Vec<u32>, address1 Address, weight1 u8, address2, weight2 u8) -> Result<i64, Error>

// To update the details of an existing index
update_index(origin, index_id u32, name Vec<u32>, address1 Address, weight1 u8, address2, weight2 u8)

// To purchase an index with desired token(deduct tokens from user), and mint an index token(The token will be sent to the user address)
* purchase_index(origin, index_id i64, amount u32) -> Result(Error)

// To redeem token with index token, it will burn the index token and transfer the underlying token back to user address
* redeem_index(origin, index_id, amount u32)

Runtime storage​

  trait Store for Module<T: Trait> as StoneIndex {
Index: map haser => StoneIndex;


Stone Index for DOT

Team πŸ‘₯​

Team members​


Team's experience​

  • Calvin is the Head of Engineering of RockX, he has worked on large-scale production systems for more than a decade, including a secure payment gateway with tens of millions customers across Southeast Asian countries and a high performance cryptocurrency trading platform using NodeJS, Java, MongoDB, and RabbitMQ. Currently, he leads a team to build the RockX digital asset services platform on blockchain, which is written in Golang and NodeJS, and running on Kubernetes.

  • Tony is a Senior Software Developer from RockX, he has worked in blockchain, fintech, adtech and cybersecurity industries for the past 13 years. His full stack development experience consists of UI / UX, frontend, backend development and server side deployment. At RockX, he is building a new digital asset platform and the languages he uses day to day are React, Redux, MySQL, MongoDB, NodeJS, Python & GoLang

  • Raphael has 8 years IT industry experience and 3 years blockchain experience. Expertise in the technologies of smart contract and defi project and familiar with the major developer ecosystem. Have experience of leading several Ethereum Dapps engineering projects.

Team Code Repos​

Team LinkedIn Profiles​

Development Roadmap πŸ”©β€‹


  • Total Estimated Duration: 3 weeks
  • Full-time equivalent (FTE): 3 FTE
  • Total Costs: 0.3 BTC

Milestone 1 - Liquid staked DOT token​

In the grant program, the Stone Team aims to provide liquidity of staked tokens on Polkadot ecosystem, and the special LP token which bounds to staked assets, like DOT token. We are aware that there are multiple teams are actively working on Polkadot ecosystem and more exciting projects on the roadmap, we'll focus on DOT-bound staked assets like aDOT first for the milestone 1 We'll also provide an easy-to-use web based UI that connects to the chrome based DOT wallet, and user can buy/sell the index using their DOT tokens easily, this UI will be part of

0a.LicenseApache 2.0
0b.DocumentationWe will provide both inline documentation of the code and a basic tutorial that explains how a user can (for example) spin up one of our Substrate nodes. Once the node is up, it will be possible to send test transactions that will show how the new functionality works.
0c.Testing GuideThe code will have unit-test coverage (min. 70%) to ensure functionality and robustness. In the guide we will describe how to run these tests
0d.Article/TutorialPublish tutorials and documentation in different channels, e.g. Stone Medium and other social media platforms
1.UI/UX for Stone PlatformUpdate and add a new UI component that allow user to buy/sell stone index using different crypto assets, DOT for milestone 1
2.Indexed basket managementAn indexed basket management module is a set of Substrate pallet which allows creation and update the indexed basket, as well as mint and burn index token function
3.DEX integrationWe will build the DEX trade function on top of another Polkadot Program PolkaDex

Future Plans​

Upon the completion of Milestone 1, the team will potentially add more functions like:

  • Introduce the governance token for the governance purpose
  • Allow user to create their own indexed basket using the governance token they earned, and get rewards of trading fees

Stone Index will be part of Stone Platform, and this grant program is the very first attempt of extent to Polkadot ecosystem in Stone Platform. The Stone team will continuously add more valuable instruments, and the team is aware that more and more teams and projects are rushing into Polkadot ecosystem, so we'll keep an eye on the new initiatives, and onboard those legitimate assets once they are ready

Additional Information βž•β€‹

RockX( founded by veterans and hardcore developers in Blockchain space, Rockx has been developing critical tools and applications for various Blockchains. RockX team is actively involved in building a better blockchain community and won quite some grants last year, the 2 examples are:

RockX helps the Stone Team to build the Stone Platform and bring Stone Platform to multiple blockchain platforms, so that allow Stone Platform users with one stop investment solution and the best user experience.