payment_queryFeeDetails

Description

Returns a detailed fee breakdown for a signed extrinsic, including baseFee, lenFee, and adjustedWeightFee. Combine with payment_queryInfo to present both total fee and components.

Parameters

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

Example (HTTP)

curl -s https://api-acala.n.dwellir.com/YOUR_API_KEY \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","id":100,"method":"payment_queryFeeDetails","params":["0xSIGNED_EXTRINSIC_HEX"]}'

Sample Response

{
  "jsonrpc": "2.0",
  "id": 100,
  "result": {
    "inclusionFee": {
      "baseFee": "0x...",
      "lenFee": "0x...",
      "adjustedWeightFee": "0x..."
    },
    "tip": null
  }
}

Code Examples

TypeScript (polkadot.js)

const details = await api.rpc.payment.queryFeeDetails(signedTx.toHex());
console.log(details.toHuman());

Python (py-substrate-interface)

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

Related Methods

• payment_queryInfo
• author_submitExtrinsic