Cross-Chain API

Next Milestone Date

July 25, 2022

Assign

Boris Polania

Ganesha Upadhyaya

Status

Live on Testnet

Github

https://github.com/harmony-one/crosschain-api/

Collaborator

Grant-1

Grant-2

Grant-3

Release Date

2022 Q3

How to Aggregate Cross Chain Liquidity?

The problem of swapping assets among multiple blockchains is a problem of liquidity. It is necessary to lock and mint, burn and release assets among multiple platforms, as these are usually wrapped tokens that are used to transfer value among blockchains.

medium.com

This project will create a CrossChain API MVP that allows:

Liquidity Providers (LPs) - that have tokens in Ethereum & BSC to add liquidity in Harmony DEXs using a single API
Swappers - to move their tokens from/to Ethereum and BSC using a single API

The expected deliverables are

Following 4 APIs:

LP-Explore
LP-AddLiquidity
LP-RemoveLiquidity
Swapper-Explore
Swapper-Swap

A client (web-based) that utilizes the aforementioned crosschain apis to explore and perform crosschain activities like adding/removing liquidity, swapping tokens to/from BSC and Ethereum. Work on this client has already started.

Milestones

All functionality is being developed in Production mode, where the API takes hashes of signed transactions, and Development mode, where the server is run locally and the API takes the PK.

Step-by-step LP

~~Add Liquidity (Alpha) - Alpha Version: 10/04/2021~~
~~Remove Liquidity (Alpha) - Alpha Version: 10/04/2021~~
Add Liquidity (Beta) - 10/20/2021
Remove Liquidity (Beta) - 10/20/2021

Step-by-step Swapper

Bridge Approval and Lock - Production and Development (Beta)
Bridge Approval, Deposit and Burn - Production and Development (Beta)
DEX - Viper Swap - Production and Development (Beta)
AWS Deployment (development) - Beta Version: 10/15/2021
DEX - Sushi (Pending) - Beta Version: 10/30/2021
DEX - Kanga (Pending) - Beta Version: TBD

End2end LP

Integration of Add Liquidity functionality into End2End swapper (Pending)

End2end Swapper

Combo API call that bridges assets from ETH BUSD into Harmony BUSD (Harmony Bridged Asset), then swaps Harmony BUSD into bscBUSD (Harmony Bridged Asset) on Viper and finally bridges bscBUSD into BUSD in BSC. (Beta)
Combo API call that bridges assets from BUSD in BSC into bscBUSD (Harmony Bridged Asset), then swaps bscBUSD into Harmony BUSD (Harmony Bridged Asset) on Viper and finally bridges Harmony BUSD into ETH BUSD. (Development/Refactoring) - Beta Version: 09/27/2021
AWS Deployment (development) - Beta Version: 10/15/2021
Integration with Sushi (pending) - Beta Version: 10/30/2021
Integration with Kanga (pending) - Beta Version: TBD

Explore APIs

~~Share of Pool Metrics in Viper (Alpha) - Alpha Version: 10/08/2021~~
~~Gas costs (Alpha) - Alpha Version: 10/08/2021~~
APY (Development) - Alpha Version: 10/22/2021
Slippage (Development) - Alpha Version: 10/22/2021
Share of Pool Metrics (Beta) - Beta Version: 10/20/2021
Has Costs (Beta) - Beta Version: 10/20/2021

Meta transactions

General Contract Manager that can aggregate signature of multiple hashes for Bridging (Development) - Alpha Version: 01/11/2021

Multi-DEX

Automated Platform for the aggregation of multiple DEXs (Pending) - Alpha Version: 12/01/2021

Web Client

Web Client that implements API functionality - Alpha Version: 12/01/2021
Define Web client functionality - Version for open discussion and approval 10/15/2021
Enroll Collaborator to develop front-end

Development Updates

Week 10/03 - 10/10

Received feedback from beta-testers and suggested changes are being implemented
Development of UI testnet started
Simple mainnet transactions were successful
Containerization is complete

Week 10/18 - 10/25

Alpha for UI client is live

Debugging for API backend is complete
Deployed to AWS in test server

Week 10/26 - 10/31

Upgrades in client UX

Multiple issues with testnet, they are now fixed and it was migrated to the new endpoint
Additional Debugging

Week 11/01 - 11/07

The App will be now temporarily named Endless Bridge, repo will be in Github this week. If the name sticks and/or does not is objected by core team or the community, it will stay.
Heavy Debugging of Dapp-backend integration
AWS deployment delayed until debugging complete
Improved UI

Week 11/08 - 11/15

beta is live in testnet, more debugging is needed, need to find the right AWS to make it public for testing by the community in testnet
Some UI improvements

Mainnet released date tentative for Dec 15

Week 11/08 - 11/15

Front-end 98% ready, some integration tasks pending, lots of testing
some changes for mainnet are being tested

Weeks 11/16 - Dec 05

Dapp is not working consistently in mainnet, we think this is mainly because natural delays and user confusion/mistakes mostly on the DEX, what this is causing is that some transactions are never completed, they will fail in the DEX swap (sometimes because there are no gas fees) or even on the bridging. One common issues is, the user will have wrapped asset in their wallet, so even though the bridge fails because she does not have enough gas in eth, the transaction will proceed to swap and even bridge into BSC. The only solution for this is a bot, fairly similar to the one I am developing for oneAnchor, so I am doing that development now with this in mind, so in the short-term both projects will be the same.
Minor UI improvements.
Improved Manager Contracts are almost completed, the intention of these is to reduce the amount of metamask calls