Watch Mempool for a transaction with a Token

In this example we will use Adder to get a log notification when there is a transaction in our mempool that includes a certain token or asset that we want to track.

⚠️ Mempool is used for pre-accepted transactions. If higher assurance is needed, use input-chainsync.

✅ For this guide we assume you are running Adder on same machine as your node. If not see our Adder Linux Guide.

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Let us start by picking an asset that we want to follow.

Step 1 - Get Asset ID / Fingerprint

In order to filter by a Token that we want to watch we need the asset id also known as the asset fingerprint. We can use tools like cexplorer.io to search by a token name so we can get the asset id / asset fingerprint.

📝 Make note of the asset fingerprint, we will need it later. For this example, we used the following asset id / asset fingerprint:

asset1uaxup2yv695uat3chgwqtpg9xvau55pd5z6r46

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Step 2 - Selecting Adder Commands

Now that we have our asset id / fingerprint that we want to monitor, we are ready to look at the filters and commands we will use. For this example, we will use:

• Input Mempool
• Input Mempool Socket Path
• Filter Asset
• Filter Type
• Output

Input Mempool

We need to specifiy that the input we want to use is our mempool by using the following flag:

--input mempool

Input Mempool Socket Path

We need to specifiy socket path for the mempool of a Cardano Node that we are running Adder on.

⚠️ Adjust the file path below to match your path

--input-mempool-socket-path /home/user/cardano-my-node/db/socket

💡 Tip: To find the path to your node socket run the following command:

echo $CARDANO_NODE_SOCKET_PATH

Filter Asset

We can use the asset fingerprint from above for cTOSI to have Adder track transactions with that fingerprint by using the following filter:

--filter-asset asset1uaxup2yv695uat3chgwqtpg9xvau55pd5z6r46

Filter Type - Transaction

For this example, we want to get alerts when a transaction occurs using the cTOSI asset id / fingerprint. To do this we will add the following filter:

--filter-type input.transaction

Output

We want the output events to console using logger. So that when a transaction that contains cTOSI occurs, we will receive log to console. To do this we will add the following flag:

--output log

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Step 3 - Putting it All Together

To get a log notification when a transaction includes the Tosidrop token cTOSI, we will run the following command in our command prompt:

⚠️ Please adjust socket path

./adder --input mempool --input-mempool-socket-path /home/user/cardano-my-node/db/socket --filter-type input.transaction --filter-asset asset1uaxup2yv695uat3chgwqtpg9xvau55pd5z6r46 --output log

Congratulations!

Anytime a transaction appears in our mempool containing cTOSI you will get a log event.

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💡 TIP: You can get a list of all available commands by using the -h or --help flag.

See our other examples to see what else Adder can do and unlock the power of Adder 💪

1. Example 1 - Watch My Wallet and get a Desktop Notification
2. Example 2 - Watch a Token and get a Desktop Notification
3. Example 3 - Watch an SPO and get an Alert in Discord
4. Example 4 - Watch a Smart Contract for a Specific Asset ID and get a Desktop Notification
5. Example 5 - Watch an DRep and get an Alert in Telegram
6. Example 6 - Watch Mempool for a Transaction with a Token