Stream pending transactions

[destine10]

Hi Guys,
I am able to stream pending transactions using this guide https://www.quicknode.com/guides/defi/how-to-stream-pending-transactions-with-ethers-js

Is it possible to do this with a HTTPS endpoint instead of WSS?

[zemse]

Yeah if the RPC API supports pending filters, it should definitely work. Are you facing any problems?

const provider = new ethers.providers.JsonRpcProvider('https://url')
provider.on('pending', console.log)

[destine10]

Hi Zemse - yeah it doesn't seem to work with any RPC APIs I try.
Is it common for them to not support pending?

[zemse]

Just tried to reproduce and I can see that it works:

p = new ethers.providers.JsonRpcProvider('https://eth-mainnet.alchemyapi.io/v2/api-key')
p.on('pending', console.log)

[Log] {hash: "0xcb8c183a87734ec12842a24c88d041e83de8b74cc8ebb5cb980b3b7699256174", type: 0, accessList: null, blockHash: null, blockNumber: null, …} (2.f662a2ed.chunk.js, line 2)
[Log] {hash: "0x8f90e41033f155402afb51362700e07483a39238f7189f0ad607c165a3913ba5", type: 2, accessList: [], blockHash: "0x87fa4ece40239a1b6501859923a1ac351bd5617570480c08156eee1b11524c08", blockNumber: 13678013, …} (2.f662a2ed.chunk.js, line 2)

If you use InfuraProvider or AlchemyProvider, then it doesn't work, but if you directly use JsonRpcProvider then it works. This is the particular code for pending filter in JsonRpcProvider, while it is overriden for UrlJsonRpcProvider. cc: @ricmoo

[destine10]

OK awesome thanks for that. Do I need to install anything in addition to the core npm install?

[zemse]

Nope JsonRpcProvider is included in ethers umbrella package, as long as you npm install ethers, that should be enough.