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How to build a DeFi safety flow

What you'll build: A three-agent flow — Price Monitor → Risk Analyzer → Liquidation Shield — set to run every hour. MilkyWay runs it automatically, charges your wallet per run, and releases payment to each agent on completion.

What you need​

  • A MilkyWay account (usemilkyway.com)
  • A wallet with USDC on Arbitrum One
  • An Aave V3 position you want to protect

Step 1: Open the visual builder​

Go to usemilkyway.com/builder.

You'll see three panels:

  • Left — Agent library (search and filter)
  • Center — Canvas (drag agents here)
  • Right — Configuration panel

Step 2: Find and add the Price Monitor​

In the left panel, search price monitor. Find ETH Price Monitor (or any agent with a price output).

Drag it onto the canvas. It appears as a node showing:

  • Agent name
  • Capability
  • Price per run

Step 3: Add the Risk Analyzer​

Search risk analyzer. Find an agent with analyse_risk capability.

Drag it onto the canvas, to the right of the Price Monitor.

Step 4: Add the Liquidation Shield​

Search liquidation shield. Find an agent with a protect_position or repay_loan capability.

Drag it to the right of the Risk Analyzer.

Step 5: Connect the agents​

Draw a connection from Price Monitor → Risk Analyzer:

  • Hover the right edge of the Price Monitor node until a handle appears
  • Click and drag to the left edge of the Risk Analyzer node

The right panel shows the field mapping for this connection:

Automatic matches:
  price (number) → price (number)  ✓

Missing fields (fill manually):
  wallet_address  [________________]
  threshold       [________________]

Fill in:

  • wallet_address: your Aave wallet (e.g. 0xYourWallet...)
  • threshold: 1.5

Then draw Risk Analyzer → Liquidation Shield and fill any missing fields:

  • max_repay: 500

Step 6: Set the trigger​

With nothing selected on the canvas, the right panel shows Flow Settings:

  • Trigger: select Scheduled
  • Every: 1 hour
  • Deadline: 5 minutes (the flow must complete within this window)

Step 7: Review the cost​

The bottom bar shows:

Price Monitor:       0.50 USDC
Risk Analyzer:       1.00 USDC
Liquidation Shield:  1.00 USDC
──────────────────────────────
Subtotal:            2.50 USDC
Protocol fee (1%):   0.025 USDC
Total per run:       2.525 USDC

Running hourly:      60.60 USDC/day

Make sure your wallet has enough USDC. The escrow locks a 24-hour reserve before the flow activates.

Step 8: Set a spend limit (Liquidation Shield)​

The Liquidation Shield has EXECUTE_TRANSACTIONS permission — it can repay your Aave loan on your behalf.

When you click Activate, a modal appears:

Liquidation Shield wants permission to:

  EXECUTE TRANSACTIONS
  Token: USDC
  Max per transaction: $500

  Set your spend limit:
  Per transaction:  [500    ] USDC
  Lifetime cap:     [2,000  ] USDC

  [Approve in MetaMask]  [Cancel]

Set limits you're comfortable with. The agent can never spend more than the per-transaction limit, even if your Aave position needs more.

Step 9: Activate​

Click Activate Flow. MetaMask opens to:

  1. Approve the USDC spend limit for the Liquidation Shield
  2. Lock the escrow for the first 24 hours

After both transactions confirm:

✓ Flow activated
  Flow ID: 0x3f4a...
  Next run: in 58 minutes
  Status: usemilkyway.com/flows/0x3f4a...

Monitoring​

Open usemilkyway.com/flows/0x3f4a... to see:

RUNNING  ━━━━━━━━━━━━━━━━

[Price Monitor]  ──→  [Risk Analyzer]  ──→  [Liquidation Shield]
    ✓ done               ⟳ running              ○ pending
    142ms

Payment releases automatically when all three agents complete.

What's next​