Skip to main content
The b402 protocol charges a small fee on each transaction, deducted from the payment amount. Buyers never need to pay gas separately — all costs are handled within the transaction.

Transaction Fees

Fees are tiered by payment volume:
TierVolumeProtocol FeeFixed FeeTotal
SmallBelow $1,0000.05%$0.050.05% + $0.05
Medium1,0001,000 - 10,0000.08%$0.050.08% + $0.05
LargeAbove $10,0000.10%$0.050.10% + $0.05

Examples

Payment AmountProtocol FeeFixed FeeTotal Fee
$100$0.05$0.05$0.10
$500$0.25$0.05$0.30
$1,000$0.80$0.05$0.85
$5,000$4.00$0.05$4.05
$10,000$8.00$0.05$8.05
$25,000$25.00$0.05$25.05

How Fees Work

  • Deducted from payment amount. The recipient receives the payment minus the protocol fee. No separate fee transaction is needed.
  • Fixed fee on every transaction. The $0.05 fixed fee applies regardless of volume.
  • Smart wallet gas included. For smart wallet payments, the paymaster gas cost is included within the fee — users never need native gas tokens.
  • Collected by the protocol. Fees are collected by the Relayer contract and sent to the protocol fee recipient.

Learn More

  • Facilitator — How payments are verified and settled
  • Relayer — On-chain contract that executes transfers