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Deterministic Transaction Fees

Calculating fees#

Before sending a transaction to the cluster, a client may query the network to determine what the transaction's fee will be via the rpc request getFeeForMessage.

Fee Parameters#

The fee is based on the number of signatures in the transaction, the more signatures a transaction contains, the higher the fee. In addition, a transaction can specify an additional fee that determines how the transaction is relatively prioritized against others. A transaction's prioritization fee is calculated by multiplying the number of compute units by the compute unit price (measured in micro-lamports) set by the transaction via compute budget instructions.