I get "gas required exceeds allowance or always failing transaction" in web3.js when I call web3.eth.getGasPrice(). The error suggest that I am trying to mine a contract. I do not, I only want to get the recent gas price on Ropsten.

When I call the same function while connected to Ganache, all works as expected.

  1. I started Geth on Ubuntu to testnet
  2. I checked eth.syncing, after a while it returned "false". It has tons of ldb-data so I assume it is really synched.
  3. web3.js reports it connects properly

    npm -version web3 6.4.1 (1.0.0-beta.36)

    Geth Version: 1.8.15-stable

I ran out of ideas. I assume that I missed a specific use in Geth.

2 Answers 2


After reverting all my node.js changes, I found that my Geth intance works as expected. That is confusing.

The only explanation that I can find is that Geth needs to settle down OR it wasn't synched when I reported as such.


Without any reason, I cannot reproduce the problem after adding some annotations (console.log()) in my node modules. In other words there seems no relation with Geth.

I get the gas prices now from Geth in the range from 1000000000 to 5000000000.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.