Monitoring of pending transactions

Question

I'm using Web3.py with Infura

Is it possible to see in real time the last pending transactions ? And have all the informations about it like who send it, who received it and more.

The idea is to do a specific action when a specific transaction is seen in the mempool

Answer 1

Yeah it is possible. Web3.py has this already implemented nicely.

w3 = Web3(HTTPProvider("http://provider.com"))
w3.geth.txpool.content()

This gets you the dictionary containig queued and pending transactions.

    {
'pending': {
    '0x0216d5032f356960cd3749c31ab34eeff21b3395': {
    806: [{
        'blockHash': "0x0000000000000000000000000000000000000000000000000000000000000000",
        'blockNumber': None,
        'from': "0x0216d5032f356960cd3749c31ab34eeff21b3395",
        'gas': "0x5208",
        'gasPrice': "0xba43b7400",
        'hash': "0xaf953a2d01f55cfe080c0c94150a60105e8ac3d51153058a1f03dd239dd08586",
        'input': "0x",
        'nonce': "0x326",
        'to': "0x7f69a91a3cf4be60020fb58b893b7cbb65376db8",
        'transactionIndex': None,
        'value': "0x19a99f0cf456000"
    }]
    },
    '0x24d407e5a0b506e1cb2fae163100b5de01f5193c': {
    34: [{
        'blockHash': "0x0000000000000000000000000000000000000000000000000000000000000000",
        'blockNumber': None,
        'from': "0x24d407e5a0b506e1cb2fae163100b5de01f5193c",
        'gas': "0x44c72",
        'gasPrice': "0x4a817c800",
        'hash': "0xb5b8b853af32226755a65ba0602f7ed0e8be2211516153b75e9ed640a7d359fe",
        'input': "0xb61d27f600000000000000000000000024d407e5a0b506e1cb2fae163100b5de01f5193c00000000000000000000000000000000000000000000000053444835ec580000000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
        'nonce': "0x22",
        'to': "0x7320785200f74861b69c49e4ab32399a71b34f1a",
        'transactionIndex': None,
        'value': "0x0"
    }]
    }
},
'queued': {
    '0x976a3fc5d6f7d259ebfb4cc2ae75115475e9867c': {
    3: [{
        'blockHash': "0x0000000000000000000000000000000000000000000000000000000000000000",
        'blockNumber': None,
        'from': "0x976a3fc5d6f7d259ebfb4cc2ae75115475e9867c",
        'gas': "0x15f90",
        'gasPrice': "0x4a817c800",
        'hash': "0x57b30c59fc39a50e1cba90e3099286dfa5aaf60294a629240b5bbec6e2e66576",
        'input': "0x",
        'nonce': "0x3",
        'to': "0x346fb27de7e7370008f5da379f74dd49f5f2f80f",
        'transactionIndex': None,
        'value': "0x1f161421c8e0000"
    }]
    },
    '0x9b11bf0459b0c4b2f87f8cebca4cfc26f294b63a': {
    2: [{
        'blockHash': "0x0000000000000000000000000000000000000000000000000000000000000000",
        'blockNumber': None,
        'from': "0x9b11bf0459b0c4b2f87f8cebca4cfc26f294b63a",
        'gas': "0x15f90",
        'gasPrice': "0xba43b7400",
        'hash': "0x3a3c0698552eec2455ed3190eac3996feccc806970a4a056106deaf6ceb1e5e3",
        'input': "0x",
        'nonce': "0x2",
        'to': "0x24a461f25ee6a318bdef7f33de634a67bb67ac9d",
        'transactionIndex': None,
        'value': "0xebec21ee1da40000"
    }],
    6: [{
        'blockHash': "0x0000000000000000000000000000000000000000000000000000000000000000",
        'blockNumber': None,
        'from': "0x9b11bf0459b0c4b2f87f8cebca4cfc26f294b63a",
        'gas': "0x15f90",
        'gasPrice': "0x4a817c800",
        'hash': "0xbbcd1e45eae3b859203a04be7d6e1d7b03b222ec1d66dfcc8011dd39794b147e",
        'input': "0x",
        'nonce': "0x6",
        'to': "0x6368f3f8c2b42435d6c136757382e4a59436a681",
        'transactionIndex': None,
        'value': "0xf9a951af55470000"
    }, {
        'blockHash': "0x0000000000000000000000000000000000000000000000000000000000000000",
        'blockNumber': None,
        'from': "0x9b11bf0459b0c4b2f87f8cebca4cfc26f294b63a",
        'gas': "0x15f90",
        'gasPrice': "0x4a817c800",
        'hash': "0x60803251d43f072904dc3a2d6a084701cd35b4985790baaf8a8f76696041b272",
        'input': "0x",
        'nonce': "0x6",
        'to': "0x8db7b4e0ecb095fbd01dffa62010801296a9ac78",
        'transactionIndex': None,
        'value': "0xebe866f5f0a06000"
    }],
    }
}
}

Docs: https://web3py.readthedocs.io/en/latest/web3.geth.html?highlight=txpool#web3.geth.txpool.TxPool.content

Answer 2

Here's 2 way of doing that, check it out in Quicknode's blog: https://www.quicknode.com/guides/defi/how-to-access-ethereum-mempool Get txpool.content is usually quite slow as you have to fetch and wait all content, then remove the duplicated ones. Best way is to build your own node, modify the code of geth and filter the transaction in node side.