user46375: Suppose, I've dynamically -- via the command line/RPC -- created an address or payment_query in Electrum. And saved its details in a database along with the amount of bitcoins I expect to receive. 
How can then check/poll if that amount of bitcoins has arrived to that address? Also via the command line/RPC. 
I don't want to be notified by Electrum, rather I want to poll Electrum daemon myself. Hence an http request-callback which Electrum can send to a URL isn't an option I'm looking for. Also, at the moment, I don't have a blockchain locally. Maybe later I'll add it, though.

user58857: Just found out how to look for an address balance using Electrum RPC:
{"id":"myquery","method":"getaddressbalance","params":["14vuRY354EaxDu4WrgjtvoDEwntDNwMVbx"]}


user87207: Jirico's answer is the right one. Gotta make sure you put the address you're querying in params.
If you need more depth than just a balance, you can also getaddresshistory
{"id":"myquery","method":"getaddresshistory","params":["14vuRY354EaxDu4WrgjtvoDEwntDNwMVbx"]}

You can find a list of commands here: An Introduction to the Electrum Python Console

user57864: There are several ways depending on what you are using.  If you are wanting to query the daemon - one must assume you are running a Linux box or VPS
You do not want or need an " address balance " - you need YOUR wallet balance
This question has already been partially answered here =>  How would one monitor an address for a transaction and 1 confirmation in PHP?
The best way however is to use what the Electrum docs recommend - a curl call like this =>  curl --data-binary '{"id":"curltext","method":"getbalance","params":{"funded":true}}' http://127.0.0.1:7777
If you are using PHP - it would look something like this:
$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, "http://127.0.0.1:7777");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, "{\"id\":\"curltext\",\"method\":\"getbalance\",\"params\":{\"funded\":true}}");
curl_setopt($ch, CURLOPT_POST, 1);

$headers = array();
$headers[] = "Content-Type: application/x-www-form-urlencoded";
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

$result = curl_exec($ch);
if (curl_errno($ch)) {
    echo 'Error:' . curl_error($ch);
}
curl_close ($ch);

You could make this inside a try-catch and trigger it by a cron job running at whatever interval you want to check
What comes back is a JSON-RPC file which you can decode into an array
$result =  json_decode($response, true);

and plug that into another variable for the single thing or things you want to work on from there
$wanted = $result["result"]["xxxxxxxxx"];

any of the parameters can be passed as a variable to the curl call
for instance to add a request it would go like this:
curl_setopt($ch, CURLOPT_POSTFIELDS, "{\"id\":\"curltext\",\"method\":\"addrequest\",\"params\":{\"amount\":\"$how_much\",\"memo\":\"$your_memo->some_data_field\"}}");

You just need to run a  "getbalance " - or any - command see what it returns and adjust your code to pull the returned value from "result" - you just test for a greater than " 0 " and then empty the wallet by sending it to another wallet and wait for the next payment
You could then use that data to trigger a "do something" like the email example in the above link from the middle example there.

46375: <p>Suppose, I've dynamically -- via the command line/RPC -- created an address or payment_query in Electrum. And saved its details in a database along with the amount of bitcoins I expect to receive. </p>

<p>How can then check/poll if that amount of bitcoins has arrived to that address? Also via the command line/RPC. </p>

<p>I don't want to be notified by Electrum, rather I want to poll Electrum daemon myself. Hence an http request-callback which Electrum can send to a URL isn't an option I'm looking for. Also, at the moment, I don't have a blockchain locally. Maybe later I'll add it, though.</p>
 58857: <p>Just found out how to look for an address balance using Electrum RPC:</p>

<pre><code>{"id":"myquery","method":"getaddressbalance","params":["14vuRY354EaxDu4WrgjtvoDEwntDNwMVbx"]}
</code></pre>
 87207: <p>Jirico's answer is the right one. Gotta make sure you put the address you're querying in params.</p>

<p>If you need more depth than just a balance, you can also getaddresshistory</p>

<pre><code>{"id":"myquery","method":"getaddresshistory","params":["14vuRY354EaxDu4WrgjtvoDEwntDNwMVbx"]}
</code></pre>

<p>You can find a list of commands here: <a href="https://bitzuma.com/posts/an-introduction-to-the-electrum-python-console/" rel="nofollow noreferrer">An Introduction to the Electrum Python Console</a></p>
 57864: <p>There are several ways depending on what you are using.  If you are wanting to query the daemon - one must assume you are running a Linux box or VPS</p>

<p>You do not want or need an " address balance " - you need YOUR wallet balance</p>

<p>This question has already been partially answered here =>  <a href="https://bitcoin.stackexchange.com/questions/44373/how-would-one-monitor-an-address-for-a-transaction-and-1-confirmation-in-php/44398#44398">How would one monitor an address for a transaction and 1 confirmation in PHP?</a></p>

<p>The best way however is to use what the Electrum docs recommend - a curl call like this =>  <code>curl --data-binary '{"id":"curltext","method":"getbalance","params":{"funded":true}}' http://127.0.0.1:7777</code></p>

<p>If you are using PHP - it would look something like this:</p>

<pre><code>$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, "http://127.0.0.1:7777");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, "{\"id\":\"curltext\",\"method\":\"getbalance\",\"params\":{\"funded\":true}}");
curl_setopt($ch, CURLOPT_POST, 1);

$headers = array();
$headers[] = "Content-Type: application/x-www-form-urlencoded";
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

$result = curl_exec($ch);
if (curl_errno($ch)) {
    echo 'Error:' . curl_error($ch);
}
curl_close ($ch);
</code></pre>

<p>You could make this inside a try-catch and trigger it by a cron job running at whatever interval you want to check</p>

<p>What comes back is a JSON-RPC file which you can decode into an array</p>

<pre><code>$result =  json_decode($response, true);
</code></pre>

<p>and plug that into another variable for the single thing or things you want to work on from there</p>

<pre><code>$wanted = $result["result"]["xxxxxxxxx"];
</code></pre>

<p>any of the parameters can be passed as a variable to the curl call</p>

<p>for instance to add a request it would go like this:</p>

<pre><code>curl_setopt($ch, CURLOPT_POSTFIELDS, "{\"id\":\"curltext\",\"method\":\"addrequest\",\"params\":{\"amount\":\"$how_much\",\"memo\":\"$your_memo-&gt;some_data_field\"}}");
</code></pre>

<p>You just need to run a  "getbalance " - or any - command see what it returns and adjust your code to pull the returned value from "result" - you just test for a greater than " 0 " and then empty the wallet by sending it to another wallet and wait for the next payment</p>

<p>You could then use that data to trigger a "do something" like the email example in the above link from the middle example there.</p>
