feat(defi): add asset-leasing example (Anchor + Quasar)#39
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Adds a new defi/asset-leasing example demonstrating onchain securities lending — the same primitive that underpins TradFi stock-loan desks — with two full implementations: **Anchor** (defi/asset-leasing/anchor/) - Seven instruction handlers covering the complete bilateral lease lifecycle: create_lease → take_lease → pay_lease_fee / top_up_collateral → return_lease / liquidate / close_expired. - PDA-backed leased and collateral vaults; per-second fee accrual via last_paid_timestamp; Pyth PriceUpdateV2 staleness + feed-id guard on liquidation; Token-2022 compatible via TokenInterface. - LiteSVM integration test suite (11 tests) covering every handler, error path, and branch scenario. **Quasar port** (defi/asset-leasing/quasar/) - Same seven handlers, same Lease state layout (byte-for-byte compatible with the Anchor version), same PDA seed conventions. - Differs from the Anchor version in: one-byte explicit discriminators, no init_if_needed ATA creation, classic Token only (not Token-2022), one active lease per holder (no lease_id in PDA seed). **README** (defi/asset-leasing/anchor/README.md) - Explains the securities-lending model for readers unfamiliar with finance; Investopedia links on every financial term at first mention. - Program flow section with three named participants: Alice (holder, earns yield on idle inventory), Bob (short seller, bearish thesis on NVIDIA), and Carol (keeper bot, earns liquidation bounty). Uses USDC and NVDAx as primary example tokens; TSLAx noted as a parallel case. - Each lifecycle step lists the instruction handler called and every account that changes, with before/after values in table form. - Complete lifecycle reference with exact numbers that match the LiteSVM tests one-to-one. - Bilateral vs pooled lending comparison. - Safety and edge-case section covering all error variants and deliberate design trade-offs. https://claude.ai/code/session_01Etk82ApiAusLAUezvmzVts
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mikejhale
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Summary
Adds a new
defi/asset-leasingexample demonstrating onchain securities lending — the same bilateral deal structure used by TradFi stock-loan desks — with two full implementations.Anchor (
defi/asset-leasing/anchor/)Seven instruction handlers covering the complete bilateral lease lifecycle:
create_lease→take_lease→pay_lease_fee/top_up_collateral→return_lease/liquidate/close_expiredlast_paid_timestampPriceUpdateV2staleness + feed-id pinning guard on liquidationTokenInterfaceQuasar port (
defi/asset-leasing/quasar/)Same seven handlers, same
Leasestate layout (byte-for-byte compatible with the Anchor version), same PDA seed conventions. Differences: one-byte explicit discriminators, noinit_if_neededATA creation, classic Token only, one active lease per holder.README (
defi/asset-leasing/anchor/README.md)Test plan
cargo check --libindefi/asset-leasing/anchor/programs/asset-leasing(verified clean locally)anchor build && anchor testin the Anchor workspacecargo testin the Quasar workspacehttps://claude.ai/code/session_01Etk82ApiAusLAUezvmzVts