Fee Guard

Set a maximum fee limit in basis points. Transactions exceeding your threshold are automatically rejected before sending — no SOL wasted.

Usage

try {
  const sig = await flash.execute({
    token: 'mSOL',
    amount: 500,
    onFunds: async (ixs) => {
      ixs.push(myIx);
      return ixs;
    },
    maxFeeBps: 15,  // reject if fee > 0.15%
  });
} catch (err) {
  if (err.code === 'FEE_TOO_HIGH') {
    console.log(`Fee ${err.meta?.actualFeeBps} bps > max ${err.meta?.maxFeeBps} bps`);
    // Skip this opportunity
  }
}

Recommended Settings

Token Category	Suggested maxFeeBps	Reasoning
Direct route (SOL, USDC)	5 bps	Only VAEA fee, no swap cost
LSTs via Sanctum (mSOL, bSOL)	10 bps	Low swap cost via Sanctum
Majors via Jupiter (TRUMP)	15 bps	Moderate swap cost
Mid-caps via Jupiter (BONK)	20 bps	Higher swap slippage possible

⚠️ Warning

When using executeLocal() (Turbo Mode), fee guard is skipped because there's no API call. Use isProfitable() instead for turbo-mode cost validation.