payment_queryFeeDetails

Description#

Returns a detailed fee breakdown, including base fee, length fee, adjusted weight fee, and inclusion tip when applicable.

Parameters#

Position	Type	Description
0	string	Signed extrinsic hex
1 (optional)	string	Block hash

Response Fields#

Field	Description
`inclusionFee`	Object containing `baseFee`, `lenFee`, `adjustedWeightFee`
`tip`	Optional tip included with the extrinsic

Sample Request & Response#

{
  "jsonrpc": "2.0",
  "method": "payment_queryFeeDetails",
  "params": ["0x2523053d0002500200…63155"],
  "id": 100
}

{
  "jsonrpc": "2.0",
  "id": 100,
  "result": {
    "inclusionFee": null
  }
}

For subsidized operations (such as staking payouts), the runtime may waive inclusion fees, resulting in null. Regular transfers will return the full fee breakdown.

Code Examples#

Python
JavaScript

fee_details = substrate.rpc_request('payment_queryFeeDetails', [extrinsic_hex])['result']
print(fee_details)

const info = await api.rpc.payment.queryFeeDetails(tx.toHex());
console.log(info.toHuman());