Alba

Alba is on-chain revolving credit that settles itself - no keepers, no bots. Lenders publish committed USDC facilities against cbBTC as 1inch SwapVM programs (3 custom opcodes) backed by Aqua pull-rights; borrowers draw on demand. Each maturity is a Hedera scheduled transaction that fires an Axelar GMP message to settle on Base - signature-free via Aqua mode. Defaults trigger partial Dutch-auction liquidation. Rates price off Morpho Midnight's live curve plus a floating band via The Graph's standardized lending subgraphs.

Stack: Solidity/Foundry on a Base fork, Next.js frontend, Hedera testnet, Axelar GMP.

How it's pieced together: Our TermRouter inherits 1inch's AquaSwapVMRouter and overrides _instructions() to add three custom opcodes: _notBefore (maturity gate), _onlyTaker (settlement only via our Axelar executor), and _stopWhenCovered (caps facility draws AND halts liquidation auctions the moment the lender is made whole — one opcode, two products). Lender capital and repayments are Aqua pull-rights; collateral sits in an escrow contract that itself becomes an Aqua maker to run the Dutch-auction liquidation. Each draw registers a native Hedera scheduled transaction; on fire, it dispatches an Axelar GMP message to our AxelarExecutable on Base, which settles via swap().

The key unlock: Aqua's useAquaInsteadOfSignature — authorization is balance state, not an EIP-712 signature, so a machine can settle months later with nobody awake. That single flag is why keeper-free scheduled credit is possible at all.

Hackiest bit: Aqua indexes strategies by hash, so one byte of drift between ship() calldata and the executed order fails as a cryptic "insufficient balance." We built a single ProgramBuilder deriving both from one source of truth — our first Foundry test is the ship→execute round trip. Rates panel pulls Morpho Midnight's live curve plus one Messari standardized Graph query across Aave/Morpho/Compound — same query, three protocols, zero per-protocol code.