payment_queryInfo - JSON-RPC Method

Description

Calculates the weight and partial fee that a given signed extrinsic would incur on Enjin Matrix. Call this endpoint before author_submitExtrinsic to display fee previews or to enforce wallet budgeting logic.

Parameters

Parameter	Type	Required	Description
extrinsic	string	Yes	Signed, SCALE-encoded extrinsic in hex
blockHash	string | null	No	Block hash to evaluate against (default: best block)

Returns

Field	Type	Description
weight.ref_time	number	Execution weight measured in picoseconds
weight.proof_size	number	Size of storage proofs in bytes
class	string	Dispatch class (normal, operational, mandatory)
partialFee	string	Fee in plancks (18 decimals for ENJ)

Request Example

{
  "jsonrpc": "2.0",
  "method": "payment_queryInfo",
  "params": [
    "0x280403000b40c006a99901",
    null
  ],
  "id": 1
}

Response Example

{
  "jsonrpc": "2.0",
  "result": {
    "weight": {
      "ref_time": 162586000,
      "proof_size": 1493
    },
    "class": "mandatory",
    "partialFee": "0"
  },
  "id": 1
}

(The sample extrinsic is a system remark with zero fee; regular transfers will return a non-zero partialFee.)

Code Examples

cURL

curl https://api-enjin-matrixchain.n.dwellir.com/YOUR_API_KEY \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "payment_queryInfo",
    "params": ["0x280403000b40c006a99901", null],
    "id": 1
  }'

{
  "jsonrpc": "2.0",
  "result": {
    "weight": {
      "ref_time": 162586000,
      "proof_size": 1493
    },
    "class": "mandatory",
    "partialFee": "0"
  },
  "id": 1
}

The sample extrinsic is a system remark included in block 0x1873093eade39aa409f64537dd972c27156e4691fc0fda227a06d50c52ad5fef, so it reports a zero fee. Substitute your own signed payload to estimate fees for pending transactions.

JavaScript

const body = {
  jsonrpc: '2.0',
  method: 'payment_queryInfo',
  params: ['0xSIGNED_EXTRINSIC', null],
  id: 1
};

const info = await fetch('https://api-enjin-matrixchain.n.dwellir.com/YOUR_API_KEY', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify(body)
}).then((res) => res.json());

console.log(info.result.partialFee);

Python

payload = {
    "jsonrpc": "2.0",
    "method": "payment_queryInfo",
    "params": ["0xSIGNED_EXTRINSIC", None],
    "id": 1,
}

info = requests.post(
    "https://api-enjin-matrixchain.n.dwellir.com/YOUR_API_KEY",
    headers={"Content-Type": "application/json"},
    data=json.dumps(payload),
    timeout=10,
).json()["result"]

print(info)

Tips

• Use the returned weight to set tip values when prioritizing extrinsics.
• When building transactions with fuel tanks, check if the partial fee is zero, indicating sponsorship.
• Cache results per extrinsic payload if you queue multiple submissions of the same call.