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I've been developing a smart contract on Kovan with no issue.

I've deployed to Mainnet and the call methods (with 'external view') are returning insufficient funds for gas errors.

I thought that call methods do not cost any gas? Is this correct?

If so, what would cause call function to return an error like that?

// SPDX-License-Identifier: MIT
pragma solidity ^0.7.4;

import "@chainlink/contracts/src/v0.6/interfaces/AggregatorV3Interface.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";

  * Network: Kovan
  * Aggregator: ETH/USD
  * Address: 0x9326BFA02ADD2366b30bacB125260Af641031331

contract Contract {
  address payable public owner;

  string public dapp_name = "Eth Text";
  uint public messagesSentCount = 0;

  uint decimals = 8;
  uint scale = 10**decimals;

  uint public txtPriceUSD = 1.70 * 10**8;
  uint public txtPriceEth;

  using SafeMath for uint;

  AggregatorV3Interface internal priceFeed;

  event Spend(
    string textMsg,
    string recipient
  event TextMsgError(
    string reason

  constructor() {
    owner = msg.sender;
    priceFeed = AggregatorV3Interface(0x9326BFA02ADD2366b30bacB125260Af641031331);

  function sendTextMessage(
    string calldata textMsg,
    string calldata recipient
  ) external payable returns(bool) {

    (uint newTxtPriceEth,,) = this.pollTxtPrices();

      msg.value > newTxtPriceEth,
      'Please send the correct amount of ETH to make send a message'

    emit Spend(textMsg, recipient);
    messagesSentCount += 1;
    return true;

  function setTxtPrices(uint _txtPriceUSD) external ownerOnly() {
    (int price,) = getLatestPrice();
    uint ethPriceUSD = uint(price);

    txtPriceEth = scale.mul(_txtPriceUSD).div(ethPriceUSD);
    txtPriceUSD = _txtPriceUSD;

  function pollTxtPrices() external view returns(uint, uint, uint) {
    (int price,) = getLatestPrice();

    uint newTxtPriceEth = scale.mul(txtPriceUSD).div(uint(price));

    return (newTxtPriceEth, txtPriceUSD, decimals);

  function totalBalance() external view returns(uint) {
    return payable(address(this)).balance;

  function withdrawFunds() external ownerOnly() {

  function destroy() external ownerOnly() {

  function getLatestPrice() public view returns (int, uint) {
      ,int price,,,
    ) = priceFeed.latestRoundData();

    return (price, decimals);

  function uintToWei(uint unum) private pure returns(uint p) {
    return unum * (1 wei);

  modifier ownerOnly() {
    require(msg.sender == owner, 'only owner can call this');

  • 3
    There is some issue with your code or you're trying to use call() on a method that is updating the state of contract. Attach your code so we can check. – Miroslav Nedelchev Feb 23 at 6:47
  • I've updated the question with contact code. I definitely made a mistake and used a Kovan address for AggregatorV3Interface, when I should have used a Mainnet address. But, even calls to methods like dapp_name are failing with insufficient gas errors. @MiroslavNedelchev – GN. Feb 23 at 22:55
  • try -> c.dapp_name.call({from:account}), i think without "call" you are trying to send a transaction instead of reading the data – Majd TL Feb 26 at 10:56
  • What is the address of your contract on Kovan and Main Network? – Markus Sprunck Feb 28 at 1:14

Actually, the call does not use gas. However, it seems to be calculating gas in the truffle console. In truffle-config.js, set a larger number in networks.kovan.gas as in the example below.

ropsten example)

networks: { ... ropsten: { ... gas: 5500000,
... } },

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