OPN Fixed Term Vault
A fixed-term DeFi vault for time-based native OPN deposits.
by valerchiki · submitted Jun 2, 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 Fixed Term Vault is a simple DeFi vault deployed on OPN Chain. It lets a user open a fixed-term native OPN position, while the contract records the amount, opening time, unlock time, and closed status on-chain.
The goal is to create a small fixed-term deposit primitive that can later be expanded into savings products, vesting tools, treasury locks, or scheduled unlock vaults.
Why
Fixed-term deposits are a basic building block for DeFi. They help model delayed withdrawals, commitment-based saving, and transparent lock periods.
This version keeps the logic simple and readable so reviewers can clearly see how the vault creates positions, stores unlock times, and prevents early closing.
How it works
- The user calls
openDefaultTerm()and sends native OPN. - The contract creates a fixed-term position for that wallet.
- The unlock time is set automatically for 7 days.
- The user can read position count and position details.
- After the term ends, the user can call
closePosition().
OPN Chain usage
The contract was deployed on OPN Chain during the Season 1 window. A live openDefaultTerm() transaction was executed to prove interaction with the deployed contract.
Roadmap
02/03
What ships next.
The builder's own next-quarter plan. Use it to gauge follow-through and ambition.
Phase 1 - Current build
- Deploy the OPN Fixed Term Vault contract on OPN Chain.
- Test the
openDefaultTerm()function with native OPN. - Confirm that amount, opening time, unlock time, and closed status are stored on-chain.
- Submit the build for Season 1 review.
Phase 2 - Vault interface
- Build a simple page where users can open fixed-term positions.
- Show active and completed positions in a wallet dashboard.
- Add clear unlock date display for every position.
- Add explorer links for position transactions.
Phase 3 - Product improvements
- Add custom term lengths.
- Add ERC-20 token vault support.
- Add named vault positions for savings, vesting, and treasury use cases.
- Improve event indexing for analytics.
Beyond
- Explore fixed-term savings templates.
- Add public vault pages for transparent locked positions.
- Connect fixed-term vaults with other OPN Chain DeFi tools.
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.