On-Chain Rotating Savings Circle (ROSCA) Contribution Tool

WHAT IT DOES

On-Chain Rotating Savings Circle (ROSCA) Contribution Tool is a DeFi tool that enables members of a rotating savings circle to submit their cycle contributions and track the rotation. It reads the ROSCA contract address, member addresses and participation status, current cycle number, contribution amount per cycle, payment schedule, fund balance, member payout order, payout history, account nonce, gas estimates for contribution, and previous contribution records. The tool then guides members through submitting their cycle contribution, updating the fund balance, and triggering the payout to the next member in rotation when all contributions for the cycle are complete.

HOW TO USE

Connect your wallet via the built-in connector. Select the network where the ROSCA contract is deployed. Enter the ROSCA contract address, the contribution amount per cycle, and the payment token address (use address(0) for native token). The tool will read on-chain data and display a preview including: ROSCA contract, contribution amount, payment token, current cycle number, fund balance, total members, member contribution status, next payout recipient, your status (pending/paid), and estimated gas. Review all details carefully. Click "submit contribution" to make your contribution for the current cycle. The tool will guide you through three steps: verifying member status and cycle, submitting the contribution, and updating the fund balance.

TECHNICAL MECHANISM

The tool uses ethers.js v5.7.2 to interact with the ROSCA contract. It reads member participation status using `getMemberStatus(member)` which returns active/inactive. Current cycle number is read via `getCurrentCycle()` which returns the current cycle index. Contribution amount is read using `getContributionAmount()` and payment schedule via `getPaymentSchedule()`. Fund balance is read using `getFundBalance()` or `balanceOf()` on the fund token. Member payout order is read via `getPayoutOrder()` which returns the rotation sequence. Payout history is scanned using `eth_getLogs` for `PayoutCompleted` events, with adaptive chunking (halving chunk size on failure) to handle different RPC limits—the tool walks backward from the current block and continues even if some ranges are rejected. The contribution transaction calls `contribute()` on the contract, which transfers the contribution, updates the fund balance, and checks if all members have paid—if so, it triggers the payout to the next member in the rotation. Gas estimates are calculated using `estimateGas` with EIP-1559 fee data from `feeData`. All transactions are built with EIP-1559 fee data, and the tool uses `effectiveGasPrice` from receipts for accurate cost accounting.

WHAT IT CANNOT SEE

This tool cannot verify that members are able to pay future contributions—this depends on each member's financial situation. It cannot detect if members are misrepresenting their identity. It cannot guarantee that the rotation will complete as scheduled—members may default. It cannot prevent front-running of contributions. It cannot validate that the contribution amount is appropriate. It cannot detect if the ROSCA contract has been modified. It cannot ensure that the payout order is fair. It cannot verify that the rotating savings terms are enforced off-chain.

PLEASE NOTE

This tool is EVM-only and supports Ethereum, Polygon, BNB Chain, Arbitrum, Optimism, and Avalanche. Contribution transactions are signed by the connected wallet, and the user pays gas fees. ROSCAs rely on trust and community participation—ensure you understand the terms before joining. The tool does not store or transmit any member data.