Interacting with whitelisted smart contract

Questions
1

Hello infura.io team,
I have an application that interacts with a smart contract over your platform. To protect my API key, I put my contract under the whitelisted addresses. However, when I try to invoke a contract method using eth_sendRawTransaction, I get a

Rejected due to project ID settings error

error. How do I resolve this? Thank you in advance for your help!

(I believe I read somewhere that your platform does not support eth_sendRawTransaction for whitelisted contracts, but I could be wrong. In the case that it is so, is there an alternative way to interact with my whitelisted contract?)

2

Hi @Nicolas_Schapeler, thanks for the question and sorry you’re having this issue. To clarify, your whitelist has no errors except when you make a sendRawTransaction request?

I’m checking with the devs but using sendRawTransaction with the whitelist should be working. Can you share the code sample that you are using to make the request?

3

Thanks for getting back to me so fast Sean! That’s correct, when I’m doing a read-only transaction (so using call) it works, but when I try to do some operation involving writing to the blockchain I get said issue. The code below is what i use.

I’m using the web3.js framework for sending transactions and ethereumjs-tx for signing:

// Setup modules, connection and contract instance
const Web3 = require('web3');
let Tx = require('ethereumjs-tx').Transaction;
const web3 = new Web3(new Web3.providers.HttpProvider("https://ropsten.infura.io/v3/MYPROJECTID"));
const contract = new web3.eth.Contract(contractABI, contractAddress)

// Get the nonce
web3.eth.getTransactionCount(address, function (err, nonce) {
    if (err) throw err;
    // Get the current gas price
    web3.eth.getGasPrice().then((result) => {
        // Build the transaction object
        const txObject = {
            nonce: web3.utils.toHex(nonce),
            gasLimit: web3.utils.toHex(800000),
            gasPrice: web3.utils.toHex(web3.utils.fromWei(result, 'gwei')),
            to: contractAddress,
            data: contract.methods.someContractMethod().encodeABI()
        };

        let trx = new Tx(txObject, {'chain':'ropsten'});
        // Sign the transaction and serialize it
        trx.sign(privateKey);
        let serializedTx = trx.serialize();
        // Send it off
        web3.eth.sendSignedTransaction('0x' + serializedTx.toString("hex"), function (err, txHash) {
            if(err) throw err
            else console.log("Success!")
        });
      })
    })
  })

Thank you so much again, I really appreciate it!

4

Any news @Sean_Infura?

5

Sorry for the delay @Nicolas_Schapeler , digging into this more. It might be an issue with Ropsten whitelists…

Can you message me your specific whitelist settings and project key?

6

Sure Sean, thanks for the effort! I tried sending you a direct message with the info, but it says I can’t send a message to you. Is there some other way I could send it to you?

7

Ah, can you DM me on twitter? @seanwbren

8

Just sent you a DM :+1:

10

To any future readers:
Sean and the Infura dev team were super helpful over Twitter and sorted this out for me within two days - The issue was I needed to not only add the contract I’m interacting with to the whitelist, but also the address that was sending requests to the whitelisted contract.

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