FlashStack
Open flash-liquidity infrastructure for Bitcoin Layer 2
Atomic, uncollateralized flash loans on Stacks (Bitcoin L2). Borrow STX or canonical sBTC with zero collateral, run any on-chain strategy, and repay — all in a single transaction. If repayment fails, the whole transaction reverts. Zero risk to the protocol.
FlashStack is neutral, standalone flash-liquidity any Clarity contract can integrate — no lending market to join. It is also the rail behind DeepStack, a Bitcoin-native market-making agent that rebalances through it:
DeepStack volume → FlashStack fees → LP yield → deeper reserves → more DeepStack capacity ↻
The first live DeepStack → FlashStack → Bitflow flash-rebalance ran on mainnet in one atomic transaction.
How it works
Flash loan. Call flash-loan(amount, receiver) on a core. The core sends the asset to your receiver, invokes its callback, and requires the reserve to grow by at least the fee before the transaction ends — otherwise everything reverts. Repayment is never trusted; it is measured. This is the Aave live-reserve model, so a malicious receiver can only fail, never drain the pool.
LP pool. Anyone deposits STX or sBTC and receives shares. Every flash-loan fee stays in the pool, so each share appreciates. Withdraw principal + accrued yield anytime. Share value is exposed to lending protocols via a collateral oracle (get-share-price / get-lp-value).
Fee: 0.05% per loan. Assets: STX and canonical sBTC (SM3VDXK3WZZSA84XXFKAFAF15NNZX32CTSG82JFQ4.sbtc-token).
Live app
flashstack.vercel.app
- Flash Loan — borrow STX or canonical sBTC with zero collateral
- LP Pool — deposit, earn yield from every flash-loan fee
- Dashboard — live on-chain protocol stats
- Receivers — deployed strategy contracts and build-your-own templates
Mainnet contracts
Flash-loan engines & receivers — SP20XD46NGAX05ZQZDKFYCCX49A3852BQABNP0VG5
Hardened LP pools & oracle (v2) — SPR9PQANV6XHSDNRAX2GNKCA5Z1KH61961KE0BYG
The v2 pools add virtual shares/assets (OpenZeppelin ERC-4626 style) against first-depositor share inflation. The earlier v1 pools are deprecated.
Security
Status: mainnet, not yet professionally audited. Use at your own risk.
This is the beginning of the README. Read the rest at the original. Read the full README ↗
