Run a rotating savings circle with transparent rules in a smart contract
Advanced26h2–3
SolidityFoundryWagmi
17/20All-or-Nothing Crowdfund
Backers get automatic refunds if the goal is not reached.
Intermediate16h1–2 people17/20 fit
Build All-or-Nothing Crowdfund for community projects in ~16h with 1–2 people. Stack: Solidity + Foundry + Wagmi.
Why it wins: Classic contract pattern with real use.
Build flow
01 · Problem
Crowdfunding platforms take big fees and refunds are not guaranteed.
02 · Solution
A contract holds pledges until the deadline, releases funds if the goal is met and lets backers claim refunds otherwise.
03 · Build
- 1Write the contract
- 2Test edge cases
- 3Build campaign page
- 4Deploy
04 · Demo
Fail a campaign on testnet and claim a refund.
MVP checklist
- Pledges
- Deadline
- Automatic release
- Refund claims
Tech stack
| Tech | Role | |
|---|---|---|
| Solidity | Smart contracts | Chain |
| Foundry | Contract testing + deploy | Chain |
| Wagmi | React wallet hooks | Chain |
Reference repos
Open-source projects you can build on. Links checked 2026-10-31.
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