I have deployed an Ethereum private network PoA with geth connecting 3 nodes: 2 nodes in aws EC2 instances and my own laptop. My purpose is to store strings in the network, so therefore, i have deployed the following Smart Contract:

// SPDX-License-Identifier: MIT pragma solidity ^0.8.4;

contract CRUDOptimizado {

// Variables de estado 
string[] data;


// Operación CREATE
function createData(string memory _description) public{

// Operación READ por búsqueda de la posición en memoria
function readData(uint _id) public view returns (string memory) {
    return (data[_id]);

//Operacion READ todos las entradas de datos
function readAllData() public view returns (string[] memory){
    return data;

//Operacion COUNT de todas las entradas de datos
function readcount() public view returns (uint){
    return data.length;

// Operación UPDATE
function updateData(uint _id, string memory _description) public returns (string memory){
    data[_id] = _description;
    return (data[_id]);

// Operación DELETE
function deleteData(uint _id) public{
    delete data[_id];


I have succesfully deployed an API with Express to interact with my Smart Contract methods. The following middleware calls the function "createData" from Smart Contract: app.post('/post/file',async (req,res,next) =>{

    const file = JSON.stringify(req.files.file);
    //const buffer = req.files.file.data;

    const receipt = await contract.methods.createData(file).send({
        from: addressSender

When I store huge JSONs (parsing them to strings in the API), I have problems with gas allowance. Geth console: Served eth_sendTransaction duration=470.274556ms err="gas required exceeds allowance (50000000)"

Here is part of my genesis file (I have modified gasLimit): { "config": { "chainId": 113, "homesteadBlock": 0, "eip150Block": 0, "eip150Hash": "0x0000000000000000000000000000000000000000000000000000000000000000", "eip155Block": 0, "eip158Block": 0, "byzantiumBlock": 0, "constantinopleBlock": 0, "petersburgBlock": 0, "istanbulBlock": 0, "clique": { "period": 3, "epoch": 30000 } }, "nonce": "0x0", "timestamp": "0x62f60dbd", "extraData": "0x0000000000000000000000000000000000000000000000000000000000000000cf9c875960822c4d232db99ac36f7cfbc66b07c70000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000", "gasLimit": "0x1fffffffffffffff", "difficulty": "0x1", ....

Is there any way of modifying Geth max allowance (it is capping gas at 50,000,000)? If it isn´t, is there any other private Blockchain with 0 gas price with documentation?


1 Answer 1


Checkout the geth commandline options here. I think you're looking for rpc.gascap

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