Contracts overview

Pesalo's on-chain layer is a Soroban yield protocol modelled after Pendle (PT/YT yield tokenization + a logit-curve AMM). Five contracts ship today.

                      ┌──────────────┐
                      │   Router     │   user → smart wallet → router.boost(...)
                      │  (entry pt)  │
                      └──────┬───────┘
                             │
            ┌────────────────┼────────────────┐
            │                │                │
       ┌────▼────┐     ┌─────▼─────┐     ┌────▼─────┐
       │   SY    │     │  Splitter │     │  Yield-  │
       │ adapter │     │ (PT + YT) │────▶│  Market  │
       │ (Blend) │     │           │     │  (AMM)   │
       └─────────┘     └───────────┘     └──────────┘

Contract	What it does
Router	The single entry point users call (auto_deposit, auto_withdraw, boost, unboost, redeem_boost). Pre-authorizes sub-invocations so smart wallets only sign once.
SY adapter	Wraps the underlying asset into a yield-bearing SY (Standardized Yield) token. Today it sits on top of Blend on Stellar. One SY per asset (USDC / EURC / XLM).
Splitter	Splits 1 SY into 1 PT (Principal Token) + 1 YT (Yield Token). PT pays out at maturity; YT pays the streaming yield until then.
Yield-Market	The AMM that prices PT against SY. Uses a logit-curve so price ↔ implied APY conversions are clean and the curve concentrates liquidity near 1:1.
Yield-Math	A pure library of fixed-point helpers (WAD math, log, exp). No state.

Repos

Live in contracts/ at the repo root. Build with stellar contract build (uses the wasm32v1-none target — Soroban doesn't support the reference-types extension that wasm32-unknown-unknown emits). Every contract has tests in its tests/ folder; the yield-market has snapshot fixtures for the curve.

Routing through OZ Channels

Pesalo's smart wallet doesn't pay fees directly. Every Soroban tx the mobile app signs is uploaded to OpenZeppelin Channels' testnet relayer, which sponsors the transaction fee + submits to Soroban RPC. This means a brand-new wallet can call auto_deposit immediately without first being funded with XLM for fees.

Mobile signs tx → POST {/v1/transactions, channels-api-key}
                       to channels.openzeppelin.com/testnet
                       → Channels relayer signs as fee account → Soroban RPC submit
                       → returns final tx hash

See Mobile / Soroban relayer for the client side.