Solana — Devnet (Solend Yield)

Heron's primary chain. The Anchor program deploys on Solana devnet with real CPI into Solend's wSOL reserve.

Overview

Parameter	Value
Network	Solana Devnet
Asset	wSOL (wrapped SOL)
Venue	Solend (reserve `5VVLD7BQp8y3bTgyF5ezm1ResyMTR3PhYsT4iHFU8Sxz`)
Program	`BSPwK2zXA4K887pbm5ovxzVQS2rWJAaQkkiEU3TRY632`
Yield source	Borrower utilization (~1.27% supply APY)
Decimals	9 (native SOL precision)

How It Works

User connects Solana wallet via Reown AppKit
Deposits wSOL → vault PDA created per-user (non-custodial)
Keeper runs 5-min cycles, evaluates via Net-Edge gate
On approval: Solend CPI deposit — real cTokens received
Exchange rate ~1.06 proves real yield accrual

Vault Program (heron-vault)

The Anchor program at BSPwK2zXA4K887pbm5ovxzVQS2rWJAaQkkiEU3TRY632 provides:

Instructions

Instruction	Description
`initialize_policy`	Set mandate root, caps, position limits
`initialize_vault`	Create vault, link to policy, set executor
`deposit`	User moves wSOL into vault
`withdraw`	User moves wSOL out (never blocked)
`execute`	Agent allocates into Solend (Merkle-verified, cap-checked, nonce-guarded)
`deallocate`	Agent redeems from Solend (same Merkle proof, skips caps)
`emergency_exit`	Owner sweeps all venues back to idle in one tx
`set_paused`	Kill switch (freezes agent, never blocks withdrawal)

Timelock

queue_venue_add — propose new venue with delay
queue_caps_increase — propose raising caps with delay
Sentinel can veto queued changes (never raise them)

Solend Integration

The vault performs real Cross-Program Invocation (CPI) into Solend's lending protocol:

execute instruction
  → Merkle proof verification (venue whitelisted?)
  → Cap check (per-action, epoch, position)
  → Nonce + expiry check (replay guard)
  → Solend CPI: deposit wSOL into reserve
  → Receive cTokens (claim on deposited capital + accrued interest)

Deployment

# Build and deploy the program
cd packages/solana
anchor build
anchor deploy --provider.cluster devnet
 
# Run keeper for Solana
cd app/backend
HERON_NETWORK=solana uv run python keeper_run.py --execute

Environment Variables

HERON_SOLANA_RPC=https://devnet.helius-rpc.com/?api-key=YOUR_KEY
HERON_SOLANA_KEYPAIR=~/.config/solana/heron-solana-vault-owner.json

Architecture Arc (Testnet)