Implementation status

Contract

Complete in source and local tests

• Fixed six, nine, and twelve-month terms at 20%, 22.5%, and 25% LTV.
• Fixed 10% APY fee calculated and paid upfront in FUEL.
• Atomic USDC principal transfer when a loan opens.
• Partial and full principal repayment strictly before maturity.
• Proportional FUEL collateral release on each repayment.
• Terminal maturity with no grace period or post-maturity cure.
• Permissionless FUEL and USDC pool top-ups.
• Owner-only idle-fund withdrawals that cannot consume locked collateral.
• Transferable ownership with zero-address, self-transfer, former-owner, and unauthorized-caller protections.
• Owner-controlled price-oracle rotation with zero-address, unchanged-address, former-owner, and unauthorized-caller protections.
• Permissionless matured-loan finalization with status and maturity enforcement.
• Reusable, five-minute FUEL price attestations bound to domain, chain, and contract.
• Immutable original loan terms with separate mutable settlement/default accounting.

The release build is deployed on testnet. Its pools remain unfunded and the production application is not wired to it.

Test coverage

Sway unit tests

• Principal, interest, fee, default, and withdrawal math at minimum, middle, boundary, and maximum-safe values.
• Ceiling rounding for upfront fees.
• Strict repayment and delinquency time boundaries.
• Price-attestation age, domain, chain, contract, price, and timestamp binding.
• Supported and unsupported term behavior.

Local Fuel Core end-to-end tests

• Signed price-attested opening and atomic USDC transfer.
• Price freshness, tampering, invalid signer, and cross-contract replay resistance.
• Wrong assets, payments, terms, borrowers, amounts, and loan IDs.
• Partial/full repayment, rounding, maturity rejection, terminal default, and double-settlement protection.
• Twelve mixed loans across multiple borrowers, terms, repayment states, and defaults with exact aggregate accounting.
• Adversarial attempts against signatures, liquidity, collateral, repayments, and settlement.
• Permissionless funding by unrelated wallets with exact cumulative stats.
• Ownership transfer chains, unauthorized/zero/self transfers, former-owner authority loss, current-owner withdrawals, and oracle rotation.
• Old-oracle signature rejection and new-oracle signature acceptance after rotation.
• Premature, repeated, repaid-loan, longer-term-loan, and nonexistent-loan delinquency attempts.
• Role-separated deployer and price-oracle wallet storage, migration, local funding, configured deployment, and signing.

Current validated result: 13 project tests, 538 assertions, and 13 Sway unit tests.

Application

Available

• Fuel wallet connectivity and verified FUEL balance reads.
• Quote interface for fixed terms.
• Explicitly browser-only Burner loan simulation.
• Connected My Loans views, partial/full simulated repayments, history, reminders, and CSV export.

Pending before real borrowing

• Production price-oracle operations and monitoring.
• Real open_loan, repayment, ownership, and pool transaction wiring.
• Funded testnet FUEL/USDC pools and end-to-end testnet loan validation.
• Independent contract audit.
• Mainnet custody, ownership-transfer, monitoring, and emergency procedures.
• Explicit testnet and mainnet release approval.

Deployment gates

Local deployment is automated and tested. Testnet deployment is guarded by explicit confirmation and refuses to overwrite a recorded deployment. Mainnet remains intentionally disabled until every pending production requirement above is complete.