estimateGas

Generates and returns an estimate of how much gas is necessary to allow the transaction to complete. The transaction will not be added to the blockchain. Note that the estimate may be significantly more than the amount of gas actually used by the transaction, for a variety of reasons including EVM mechanics and node performance.

Parameters

See jumbo_call parameters, expect that all properties are optional. If no gas limit is specified geth uses the block gas limit from the pending block as an upper bound. As a result the returned estimate might not be enough to executed the call/transaction when the amount of gas is higher than the pending block gas limit.

Returns

QUANTITY

the amount of gas used.

Requests

C#

var client = new HttpClient();
var request = new HttpRequestMessage(HttpMethod.Post, "https://testnode.jumbochain.org");
var content = new StringContent("{\n\t\"jsonrpc\":\"2.0\",\n\t\"method\":\"jumbo_estimateGas\",\n\t\"params\":[\n\t],\n\t\"id\":1\n}", null, "application/json");
request.Content = content;
var response = await client.SendAsync(request);
response.EnsureSuccessStatusCode();
Console.WriteLine(await response.Content.ReadAsStringAsync());

cURL

curl --location 'https://testnode.jumbochain.org' \
--header 'Content-Type: application/json' \
--data '{
	"jsonrpc":"2.0",
	"method":"jumbo_estimateGas",
	"params":[
	],
	"id":1
}'

HTTP

POST / HTTP/1.1
Host: testnode.jumbochain.org
Content-Type: application/json
Content-Length: 76

{
	"jsonrpc":"2.0",
	"method":"jumbo_estimateGas",
	"params":[
	],
	"id":1
}

Java

OkHttpClient client = new OkHttpClient().newBuilder()
  .build();
MediaType mediaType = MediaType.parse("application/json");
RequestBody body = RequestBody.create(mediaType, "{\n\t\"jsonrpc\":\"2.0\",\n\t\"method\":\"jumbo_estimateGas\",\n\t\"params\":[\n\t],\n\t\"id\":1\n}");
Request request = new Request.Builder()
  .url("https://testnode.jumbochain.org")
  .method("POST", body)
  .addHeader("Content-Type", "application/json")
  .build();
Response response = client.newCall(request).execute();

NodeJs

const axios = require("axios");
let data = JSON.stringify({
  jsonrpc: "2.0",
  method: "jumbo_estimateGas",
  params: [],
  id: 1,
});

let config = {
  method: "post",
  maxBodyLength: Infinity,
  url: "https://testnode.jumbochain.org",
  headers: {
    "Content-Type": "application/json",
  },
  data: data,
};

axios
  .request(config)
  .then((response) => {
    console.log(JSON.stringify(response.data));
  })
  .catch((error) => {
    console.log(error);
  });

Python

import requests
import json

url = "https://testnode.jumbochain.org"

payload = json.dumps({
  "jsonrpc": "2.0",
  "method": "jumbo_estimateGas",
  "params": [],
  "id": 1
})
headers = {
  'Content-Type': 'application/json'
}

response = requests.request("POST", url, headers=headers, data=payload)

print(response.text)

Javascript

const myHeaders = new Headers();
myHeaders.append("Content-Type", "application/json");

const raw = JSON.stringify({
  jsonrpc: "2.0",
  method: "jumbo_estimateGas",
  params: [],
  id: 1,
});

const requestOptions = {
  method: "POST",
  headers: myHeaders,
  body: raw,
  redirect: "follow",
};

fetch("https://testnode.jumbochain.org", requestOptions)
  .then((response) => response.text())
  .then((result) => console.log(result))
  .catch((error) => console.error(error));

Go

package main

import (
  "fmt"
  "strings"
  "net/http"
  "io/ioutil"
)

func main() {

  url := "https://testnode.jumbochain.org"
  method := "POST"

  payload := strings.NewReader(`{
	"jsonrpc":"2.0",
	"method":"jumbo_estimateGas",
	"params":[
	],
	"id":1
}`)

  client := &http.Client {
  }
  req, err := http.NewRequest(method, url, payload)

  if err != nil {
    fmt.Println(err)
    return
  }
  req.Header.Add("Content-Type", "application/json")

  res, err := client.Do(req)
  if err != nil {
    fmt.Println(err)
    return
  }
  defer res.Body.Close()

  body, err := ioutil.ReadAll(res.Body)
  if err != nil {
    fmt.Println(err)
    return
  }
  fmt.Println(string(body))
}