Im trying to send transaction to simple greeter contract with web3.js on infura node.while doing soo, Im getting this error.

 throw errors.InvalidResponse(result);

Error: The method eth_sendTransaction does not exist/is not available 

after lot of investigation about this error on internet, I came to conclusion that infura doesnt support this method and we have to sign transactions offline and send raw transactions to node. Im already doing the same. but keep getting this error please help me to fix this error.. here is my transaction signing code:

const contractFunction = contract.greet({from:web3.eth.defaultAccount},"hello all devs");

const functionAbi = contractFunction.encodeABI();

let estimatedGas;
let nonce;

console.log("Getting gas estimate");

contractFunction.estimateGas({from: account}).then((gasAmount) => {
 estimatedGas = gasAmount.toString(16);

 console.log("Estimated gas: " + estimatedGas);

 web3.eth.getTransactionCount(account).then(_nonce => {
   nonce = _nonce.toString(16);

   console.log("Nonce: " + nonce);
   const txParams = {
     gasPrice: '0x09184e72a000',
     gasLimit: 3000000,
     to: contract_Address,
     data: functionAbi,
     from: account,
     nonce: '0x' + nonce
   const tx = new Tx(txParams);
   signed_tx = web3.eth.account.signTransaction(tx, privateKey)
   tx_hash= web3.eth.sendRawTransaction(signed_tx.rawTransaction)
   tx_receipt = web3.eth.waitForTransactionReceipt(tx_hash)

  • web3.eth.sendRawTransaction returns a Promise object, not a transaction hash. You need to either await for it to complete (which means that you'll have to put everything inside an async function), or resolve the promise in some other way. – goodvibration May 19 '19 at 12:51
  • Can you please provide a code to do that??@goodvibration – ajay May 19 '19 at 14:48
  • Like I said, add await before web3.eth.sendRawTransaction, and put the whole thing inside an async function. – goodvibration May 19 '19 at 17:28
  • alligator.io/js/async-functions – Majd TL May 20 '19 at 7:40
  • Still getting same error.. I will send full code. Plz anyone solve this.. @Majid TL or goodvibration – ajay May 20 '19 at 7:45

dude (this is the third question about the same thing), I have changed some methods if you have questions about it write it down please and dont open a new question :)

this is the new code

var Tx = require('ethereumjs-tx');
const Web3 = require('web3');
const provider = new Web3.providers.HttpProvider("https://ropsten.infura.io/v3/......");
const web3 = new Web3(provider);

const account1 = '.......'; // Your account address 1
//const account2 = '' // Your account address 2
web3.eth.defaultAccount = account1;

const privateKey1 = Buffer.from('.......', 'hex');

const abi = [{"constant":false,"inputs":[{"name":"_greeting","type":"string"}],"name":"greet","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"getGreeting","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"}];

const contract_Address = "0xcbe74e21b070a979b9d6426b11e876d4cb618daf";

const myContract = new web3.eth.Contract(abi, contract_Address);

const myData = myContract.methods.greet( "hello blockchain devs").encodeABI();

web3.eth.getTransactionCount(account1, (err, txCount) => {
// Build the transaction
  const txObject = {
    nonce:    web3.utils.toHex(txCount),
    to:       contract_Address,
    value:    web3.utils.toHex(web3.utils.toWei('0', 'ether')),
    gasLimit: web3.utils.toHex(2100000),
    gasPrice: web3.utils.toHex(web3.utils.toWei('6', 'gwei')),
    data: myData  
    // Sign the transaction
    const tx = new Tx(txObject);

    const serializedTx = tx.serialize();
    const raw = '0x' + serializedTx.toString('hex');

    // Broadcast the transaction
    const transaction = web3.eth.sendSignedTransaction(raw, (err, tx) => {

and this is the proof it work

enter image description here

| improve this answer | |
  • changed : new web3.eth.Contract(abi, contract_Address) and gasLimit: web3.utils.toHex(2100000) and web3.eth.sendSignedTransaction – Majd TL May 20 '19 at 14:47
  • now i'm getting an error "TypeError: web3.eth.Contract is not a constructor". I'm on web3 1.0.0 beta – ajay May 20 '19 at 15:57
  • are you sure ? I'm using '1.0.0-beta.55' . write this in your code and take a look on the web3 version " const web3 = new Web3(provider); console.log(web3.version);" – Majd TL May 20 '19 at 16:40
  • @ajay did you fix it? – Majd TL May 21 '19 at 6:06
  • Yeah. Thank you @Majid TL. Appreciated your effort.. – ajay May 21 '19 at 9:16

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