Blockchain & Web3
DeFi Investment Package Platform
Discipline
DeFi / Fintech
Decentralized investment package platform with on-chain interest rate logic and smart contract security.

The brief
What it is and how it was built.
DeFi lets anyone buy investment products without asking permission, but running a complex interest model entirely on-chain is expensive. Compound interest with adjustable periods, referral trees and portfolios of several packages all cost a lot of gas when computed inside a contract.
Golden Sea split the work. The Solidity contract handles what it must: holding funds, enforcing deposits and withdrawals, and final settlement. The heavier calculations, such as interest accrual, referral credit and package projections, run on a Node.js server, and the results go to the contract only at settlement.
This cuts gas costs by 60 to 80% compared with doing everything on-chain, while user funds stay in the audited contract, never on the server. The server is trusted to calculate, not to hold money.
The Vue.js front end shows each investor their active packages, expected returns, interest so far and referral earnings. It borrows the language of banking apps, deposit, earn and withdraw, so people who know savings products but are new to DeFi can use it.
Scope delivered
What we delivered.
- 01Decentralised investment packages with configurable yield
- 02Funds held by the on-chain contract
- 03Complex interest calculations done on the server
- 04Calculations kept off-chain, funds kept in the contract
- 05Live portfolio dashboard
- 06Referral and package management
Category
Blockchain & Web3
Technology
Solidity · Node.js · Vue.js
Studio
Golden Sea Studios
Ho Chi Minh City, Vietnam
This project proves
App & Web DevelopmentA hybrid on-chain and off-chain architecture cutting gas cost by 60–80% versus a fully on-chain build.
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