Query transaction fee information

POST

https://dot.nownodes.io/

Authorizations

ApiKeyAuthApiKeyAuth

api-key string

NOWNodes API key passed in the api-key header.

Retrieve the transaction fee information for an extrinsic.

The payment_queryInfo method estimates the transaction fees (including weight fees, length fees, and tips) for a given extrinsic without actually submitting it to the chain. This allows applications to display accurate fee estimates to users before they sign and submit transactions.

This method is essential for:

Wallet applications showing fee estimates
DApps calculating transaction costs
Users verifying transaction affordability
Batch transaction cost optimization

Body

application/json

jsonrpcstring2.0required

JSON-RPC version identifier

methodstringpayment_queryInforequired

The method to be invoked

idinteger | stringrequired

Request identifier for matching responses

paramsArray<string>required

Array containing the hex-encoded extrinsic

Response

200OK

Fee information retrieved successfully

400Bad Request

Invalid extrinsic or request

500Internal Server Error

Internal server error

Query transaction fee information

curl -X POST 'https://dot.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "payment_queryInfo",
    "id": 1,
    "params": [
      "0x2d028400d43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d00a0db2df800ff8eaf04151687736326c9fea17e25fc5287613693c912909cb226aa4794f26a480000000000000000000000000000000"
    ]
  }'

import { JsonRpcProvider } from "ethers";

const provider = new JsonRpcProvider("https://dot.nownodes.io/");
const result = await provider.send("payment_queryInfo", [
  "0x2d028400d43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d00a0db2df800ff8eaf04151687736326c9fea17e25fc5287613693c912909cb226aa4794f26a480000000000000000000000000000000"
]);
console.log(result);

require 'eth'
require 'json'
require 'net/http'

uri = URI('https://dot.nownodes.io/')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
  "jsonrpc": "2.0",
  "method": "payment_queryInfo",
  "params": [
    "0x2d028400d43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d00a0db2df800ff8eaf04151687736326c9fea17e25fc5287613693c912909cb226aa4794f26a480000000000000000000000000000000"
  ],
  "id": 1
}'

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) do |http|
  http.request(request)
end

puts JSON.parse(response.body)

from web3 import Web3

w3 = Web3(Web3.HTTPProvider("https://dot.nownodes.io/"))
response = w3.provider.make_request("payment_queryInfo", [
  "0x2d028400d43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d00a0db2df800ff8eaf04151687736326c9fea17e25fc5287613693c912909cb226aa4794f26a480000000000000000000000000000000"
])
print(response)

import { createPublicClient, http } from "viem";

const client = createPublicClient({
  transport: http("https://dot.nownodes.io/"),
});

const result = await client.request({
  method: "payment_queryInfo",
  params: [
  "0x2d028400d43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d00a0db2df800ff8eaf04151687736326c9fea17e25fc5287613693c912909cb226aa4794f26a480000000000000000000000000000000"
],
});

console.log(result);

const endpoint = "https://dot.nownodes.io/";
const apiKey = "YOUR_API_KEY";

async function nownodesRequest(payload) {
  const response = await fetch(endpoint, {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      "api-key": apiKey,
    },
    body: JSON.stringify(payload),
  });

  return response.json();
}

const result = await nownodesRequest({ jsonrpc: "2.0", method: "payment_queryInfo", params: [
  "0x2d028400d43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d00a0db2df800ff8eaf04151687736326c9fea17e25fc5287613693c912909cb226aa4794f26a480000000000000000000000000000000"
], id: 1 });
console.log(result);

const response = await fetch('https://dot.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "payment_queryInfo",
      "id": 1,
      "params": [
        "0x2d028400d43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d00a0db2df800ff8eaf04151687736326c9fea17e25fc5287613693c912909cb226aa4794f26a480000000000000000000000000000000"
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "payment_queryInfo",
  "id": 1,
  "params": [
    "0x2d028400d43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d00a0db2df800ff8eaf04151687736326c9fea17e25fc5287613693c912909cb226aa4794f26a480000000000000000000000000000000"
  ]
}

response = requests.post('https://dot.nownodes.io/', json=payload)
data = response.json()

require 'net/http'
require 'json'

uri = URI('https://dot.nownodes.io/')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
    "jsonrpc": "2.0",
    "method": "payment_queryInfo",
    "id": 1,
    "params": [
      "0x2d028400d43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d00a0db2df800ff8eaf04151687736326c9fea17e25fc5287613693c912909cb226aa4794f26a480000000000000000000000000000000"
    ]
  }'

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |http| http.request(request) }
data = JSON.parse(response.body)

Request Body

{
  "jsonrpc": "2.0",
  "method": "payment_queryInfo",
  "id": 1,
  "params": [
    "0x2d028400d43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d00a0db2df800ff8eaf04151687736326c9fea17e25fc5287613693c912909cb226aa4794f26a480000000000000000000000000000000"
  ]
}

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "partialFee": "1000000000",
    "weight": {
      "refTime": "1000000000",
      "proofSize": "10000"
    },
    "class": "Normal",
    "paysFee": "Yes"
  }
}

{
  "jsonrpc": "2.0",
  "id": 1,
  "error": {
    "code": -32602,
    "message": "Invalid params",
    "data": "Invalid extrinsic format"
  }
}

{
  "jsonrpc": "2.0",
  "id": 1,
  "error": {
    "code": -32603,
    "message": "Internal error",
    "data": "Error calculating transaction fees"
  }
}

Documentation

How to migrate to NOWNodes

Query transaction fee information

Authorizations

Body

Response