Auto Yield

Product: DAY · https://dayprotocol.com
Surfaces: Auto Yield (opt-in stake/harvest) · Auto Pay (post-fee residual) · Vaults
Authority: docs/00-product-constitution.md
Phase 1 homes: Sui + Solana

User line

DAY: non-custodial capital rails for owners and agents. Auto Yield is opt-in stake + harvest + compound.

Locked rules

1. Stake OFF by default — owner enables Auto Yield
2. Fee on yield only — 500 bps (5%)
3. No invented APY — adapter read_apy or N/A
4. Discovery (DefiLlama) ≠ execution truth
5. Survival auto-unstake only for storage shortfall (when survival policy applies)

API routes (parity with implementation)

Method	Path
GET	/api/day/readiness
GET	/api/day/enablement
GET	/api/day/venues?chain=sui|solana
GET	/api/day/solana/apys
GET/PUT	/api/wallets/{address}/auto-yield
POST	/api/wallets/{address}/auto-yield/discover
POST	/api/wallets/{address}/auto-yield/stake
POST	/api/wallets/{address}/auto-yield/unstake
POST	/api/wallets/{address}/auto-yield/survival
GET	/api/wallets/{address}/position
POST	/api/wallets/{address}/harvest
POST	/api/wallets/{address}/withdraw
POST	/api/wallets/{address}/auto-pay
POST	/api/day/bridge/plan

Brand: product is DAY. Auto Yield / Auto Pay / Vaults are features — not separate product names for marketing.