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I want to monitor the mempool for my pending transactions. I understand one can monitor pending transactions by eth_subscribe (e.g. answered here). But some of my transactions have been stuck in the txpool, and they don't seem to show up in the result ofeth_subscribe`.

I'm confused by the difference between mempool, txpool, and pending transactions returned from eth_subscribe.

  1. how to retrieve transactions that are already in txpool?
  2. eth_subscribe only returns txid. Some of them can't be found by eth.getTransaction. What does that mean?
  3. Transactions returned from eth_subscribe are different from what are in txpool. It's unclear whether they form a superset of txpool or not.
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If you are getting confused, I suggest you use JSON-RPC

curl -X POST -d '{"jsonrpc":"2.0","method":"txpool_status","params":[],"id":1}' http://ip:port
curl -X POST -d '{"jsonrpc":"2.0","method":"txpool_content","params":[],"id":1}' http://ip:port
curl -X POST -d '{"jsonrpc":"2.0","method":"txpool_inspect","params":[],"id":1}' http://ip:port

If you are familiar with creating POST requests in the language you are using, change the above curl commands to them and use.

  • I'm not confused about the tools. I'm curious about the difference between txpool and transactions filtered by eth_subscribe('pending'). – qweruiop Nov 1 '18 at 4:20

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