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Season 1 · DeFi & Open Finance

OPN VaultGuard

Self-custodial DeFi savings vaults for goal-based native IOPN deposits on OPN Chain.

Stage 1, ReviewDeFi & Open Finance

by harley7317 · submitted May 29, 2026

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Description

01/03

What the builder said.

Written by the team, rendered as the markdown they typed in the submission wizard.

What we built

OPN VaultGuard is a self-custodial DeFi savings vault built on OPN Chain. Users can create goal-based vaults, deposit native IOPN, track progress toward a savings target, and withdraw funds after the vault unlock date.

The project includes a deployed Solidity smart contract, a Next.js dApp, wallet connection, OPN Chain configuration, contract reads/writes, transaction flow, and explorer-linked on-chain activity.

Why

Most savings products are custodial or depend on centralized financial intermediaries. OPN VaultGuard demonstrates a simple open-finance primitive where users keep custody of their funds while using transparent on-chain rules for savings goals and timed withdrawals.

It fits Season 1 DeFi & Open Finance because the core product flow depends directly on OPN Chain: vault creation, deposits, withdrawals, balances, and user vault history are all stored and executed on-chain.

How it works

  • A user connects their wallet on OPN Chain.
  • The user creates a vault with a name, goal amount, and unlock date.
  • The vault is created by calling createVault(name, goalAmount, unlockTime) on the deployed contract.
  • The user deposits native IOPN into a vault through deposit(vaultId).
  • The dApp reads getUserVaults(address) to show vault balances, progress, and unlock status.
  • After the unlock time, the user can call withdraw(vaultId).
  • If needed, the user can call emergencyWithdraw(vaultId), which closes the vault and emits an on-chain event.

OPN Chain integration

OPN Chain is not decorative in this project. It is the execution layer for the product.

Network details:

  • Chain: OPN Chain
  • Chain ID: 984
  • RPC: https://testnet-rpc2.iopn.tech
  • Explorer: https://testnet.iopn.tech
  • Native asset: IOPN

Deployed contract:

  • Contract: 0xe1D9598Dd692c8a2a773B883616a79E4DeD40Dd9
  • Deploy tx: 0x75c224d40b4c46df078cd73ff5bfcb8e36e20a113f4492cccd91b62245b9a74b
  • Explorer: https://testnet.iopn.tech/address/0xe1D9598Dd692c8a2a773B883616a79E4DeD40Dd9

Technical implementation

Smart contract:

  • Solidity 0.8.24
  • Hardhat deployment
  • Native IOPN payable deposits
  • User vault registry
  • Events for vault creation, deposits, withdrawals, and emergency withdrawals

Frontend:

  • Next.js
  • Tailwind CSS
  • wagmi + viem
  • RainbowKit wallet connection
  • OPN Chain config built into the dApp
  • Live contract reads/writes
  • Explorer links for on-chain proof

Current MVP features

  • Create a personal savings vault
  • Deposit native IOPN
  • View user vaults
  • Track savings progress against a goal
  • See lock/unlock status
  • Withdraw after unlock
  • Emergency withdraw before unlock
  • View deployed contract on the OPN explorer

Roadmap

  • Shared vaults for teams and groups
  • Vault templates for emergency funds, builder grants, and community goals
  • Completion badges or reputation for finished savings goals
  • Optional treasury/penalty routing for emergency withdrawals
  • More detailed analytics for total vault activity and user savings behavior

Links

  • Demo: https://opn-vaultguard.vercel.app
  • GitHub: https://github.com/awley-del/opn-vaultguard

Live demo

opn-vaultguard.vercel.app

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Source

github.com

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Roadmap

02/03

What ships next.

The builder's own next-quarter plan. Use it to gauge follow-through and ambition.

Phase 1 - Current MVP

  • Deployed OPNVaultGuard smart contract on OPN Chain testnet.
  • Launched the public demo dApp with wallet connection, vault creation, native IOPN deposits, vault dashboard, withdrawals, and explorer links.
  • Published the GitHub repository with contract source, frontend code, deployment script, tests, and documentation.

Phase 2 - Next 30 Days

  • Add hosted contract verification on the OPN explorer.
  • Improve vault analytics, including completed vaults, active vaults, and total user savings over time.
  • Add transaction history per vault so users can review deposits, withdrawals, and emergency withdrawals directly in the UI.
  • Add clearer onboarding for new OPN Chain users, including network setup and faucet guidance.

Phase 3 - Next Quarter

  • Add shared vaults for teams, communities, and group savings goals.
  • Add vault templates for emergency funds, builder grants, community pools, and recurring savings.
  • Add optional achievement badges for completed vault goals.
  • Improve mobile UX and wallet connection reliability.

Beyond

  • Explore programmable savings rules, including recurring deposits and milestone-based unlocks.
  • Add optional treasury or community routing for emergency-withdraw penalty metrics.
  • Build public dashboards for aggregate OPN VaultGuard activity across the network.
  • Expand the product into a broader open-finance savings primitive for OPN Chain users and builders.

On-chain proof

03/03

1 contract on OPN Chain.

The chain itself confirmed every deployment is valid, signed by the builder's wallet, and inside the season's window.

  • 01OPNVaultGuardPrimary

    0xe1D9598Dd692c8a2a773B883616a79E4DeD40Dd9

    tx 0x75c224d40b4c46df078cd73ff5bfcb8e36e20a113f4492cccd91b62245b9a74b

    deployed May 29, 2026 · block 17490938