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Fees are collected strictly on-chain by the shield-pool program. The relay and SDK do not assess or deduct fees.

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Constants

  • Fixed fee floor: 0.005 SOL
  • Variable fee: gross * 3 / 1000 (0.30%)
  • Total fee: fixed + variable
  • Net recipient amount: gross - fee
  • Minimum deposit: 10_000_000 lamports

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Worked example

For a 1 SOL (1_000_000_000 lamports) gross amount:
  • Fixed: 5_000_000 lamports
  • Variable: 1_000_000_000 * 3 / 1000 = 3_000_000 lamports
  • Fee: 8_000_000 lamports
  • Net: 992_000_000 lamports

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Where it applies

  • Deposit (publicAmount > 0): gross is the lamports moved into the pool; the recipient commitment encodes net.
  • Shield-to-shield transfer (publicAmount = 0): fee is paid out of the input notes; the output commitments sum to inputs - fee.
  • Withdrawal (publicAmount < 0): the destination receives net; the treasury PDA receives fee.