SCF #11

Neptunus is developing a DEX aggregator on Stellar to help traders get better rates.

Budget request:

Project Stage



Defi & Wallets

Based in


Team size


Active since

Late 2021
Products & Services

Neptunus is a DEX Aggregator on Stellar that allows users to execute trades on multiple liquidity sources simultaneously. Which enables users to get better rates.

What Problems We are Trying to Solve?

Fragmented Liquidity is a big problem in crypto, especially on Stellar. It gives users worse price impacts and liquidity on their trades. Which may not be high for low-amount trades, but pretty considerable for high-amount trades. Networks / Pairs with low liquidity discourage big traders to enter their money.

Neptunus trying to solving this by executing trades on multiple market pairs on SDEX. It spreads the price impact on different market pairs, therefore benefitting the users. From our research, this practice could up to doubling the amount of virtual liquidity a token have.

How Does It Work?

When users use our interface, we analyze the best trade routes on SDEX and the best ways to split the trade. All calculations are executed on the clients to ensure greater decentralization.

How Do We Use Stellar?

We are literally aggregating the SDEX Liquidity. This app are basically stellar-native in principle.

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Previous Project(s)
SCF #9
Award recipient
Make your trade more efficient with Neptunus, a liquidity aggregator on Stellar.
Learn more
Progress so far
  1. Perfecting the swap interface UI and UX
  2. Make a package/library to ease new developer integrating SDEX into their app
  3. Make a swap API endpoint for the aggregator
To get there, we request a budget of  
  • Get a better hosting
  • Setting our own horizon server if the traffics are high
  • Outsourcing things that we can’t do by ourself
Additional information

Current State of SDEX

SDEX are comprised of 2 parts for each pairs, Orderbook And Liquidity Pools. Which means liquidity are fragmented. This make price impacts higher, which is bad for users. Thankfully we can spread the price impact of a trade in one transaction by splitting that trade to 2 operations, one goes to liquidity pools, and the others to orderbook. This will be simple if the trade doesn’t need go through another asset as intermediaries, so in solving this problem we took a generalized approach.

Algorithm Quick Overview

Our algorithm works kinda like mini-horizon. We request paths with best liquidity from horizon and then request the corresponding orderbook and liquidity pool state for each assets. We split the trade into 48* operations , and we simulate which path will be taken for each operation. Note that we can’t use horizon directly for this, since horizon only returns paths based on the current ledger state. But for every operation we execute, it alters the state.

*this is an arbitrary number, but the bigger the better

What Tradeoff are you Making?

Since we are splitting trades into multiple operations, we are paying more transaction fees than usual. But since Stellar’s fees are so cheap, it’s negligible. Anyway we got safety checks to ensure the profit that came from splitting are more than the extra transaction fees.

How Do We Make Money?

We plan to take a certain percentage of the trade profit. We plan to be a public good for Stellar Ecosystem

Our Plan Ahead

We plan to make a package/sdk to make it easy for developers integrate us into their projects(something like Uniswap Widget/Jupiter SDK). We also plan to integrate soroban in the future if the DEX activity there is active.

Pitch deck
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First Deliverable
  • Demo link:


Muhammad Fachrudin Firdaus (Fahrul#7469)


Github: @firdausfarul

Mohammad Ferry Husnil Arif (Ferry#1247)


Github: @FerryHusnil

Aushaaf Fadhillah Azzah (NeoZap#7017)


Github: @NeoZap

Rico Muhammad Nashrullah

Front-end (Freelance)