How to get pending transactions?

[Gabriel1590]

I'm trying to display an state of "pending" when the transaction is incomplete.

I use the Etherscan Provider. I read that you can see this with web3 with a filter method, but I wonder ¿There is any way to do this with ethersjs?

[ricmoo]

Etherscan does not provide access to the pending transaction pool.

You can do this if you run your own node, and also, as I recently discovered by using an INFURA provider connected to their WebSocket API: InfuraProvider.getWebSocketProvider(Network).

I’ve been using it for a gas station script I’ll be releasing soon and it’s worked quite well. :)

[Gabriel1590]

@ricmoo it seems like 'getWebSocketProvider(network)' doesnt exist in ethers.providers.InfuraProvider, how can I access this, and how can I do this with just an address, I dont see anything like that in the documentation of Infura Websocket API

[ricmoo]

What version are you using? It was added in v5.

You unfortunately cannot subscribe to an individual address. The "pending" filter only provides the transaction hash.

[Gabriel1590]

^4.0.47 How can I update to v5?
And there is some way to get the pending transactions for an address using ethersjs?

[ricmoo]

Just change your package.json to use "^5.0.0". :)

That isn’t a feature that exists in Ethereum in general. You would likely need to build your own service to expose the pending transaction memory pool, you would also probably need to run your own node for this purpose.

I’ll be posting my gas station code soon, which would be a good starting point to build this type of service. But you will basically require a reliable server to host it, which implies non-trivial upkeep costs, so it isn’t for a casual project. :s

[Gabriel1590]

@ricmoo okay okay, thanks for the help. Also I notice something, when I use any method in the InfuraProvider with an projectID, it doesnt seem to update the dashboard in the Infura page of that project. you know why?

The methods I use are:
.getTransactionCount (in mainnet and ropsten testnet)
wallet.sendTransaction(in ropsten testnet)

[Gabriel1590]

@ricmoo I just update to vrs 5, it seems like utils.bigNumberify doesnt exists anymore, but in the documentation remains the same. The exact same thing happends to ocurr with the type ethers.utils.BigNumber.

edit: for the type ethers.utils.BigNumber i just pointed like ethers.BigNumber and it seems to work, but bigNumberify doesnt

[ricmoo]

This should help: https://docs.ethers.io/v5/migration/ethers-v4/#migration-v4--bignumber

Basically, it’s now BigNumber.from(value) now. :)

[zemse]

@Gabriel1590 in infura dashboard, the data doesn’t update immediately. I have seen data after 1-2 hours.

[ricmoo]

I forgot to post this link here: https://github.com/ricmoo/gas-ticker

You can retro-fit that into a simple service that will track a pending transaction pool, which I will also add a package for at some point to better demonstrate it, but for now that should get you started.

I think the OP has been answered though, no? If so I'll close this issue.