user26876: Is there any API where I can create some addresses and making a transaction beetween them just once a month without paying fees?
Or if you can recommend me somewhere with a fee under 5000 satoshis it would be great.

user4334: You could setup a cronjob to run createrawtransaction, sendrawtransaction, etc. commands monthly. Cf. "Creating, Signing, and Submitting Transactions Based on Unspent Outputs" of Mastering Bitcoin.

user26913: The Blockcypher Microtransaction API is free, they eat the transaction fee's for you if you're looking to send small and free transactions.
http://dev.blockcypher.com/

26876: <p>Is there any API where I can create some addresses and making a transaction beetween them just once a month without paying fees?<br />
Or if you can recommend me somewhere with a fee under 5000 satoshis it would be great.</p>
 4334: <p>You could setup a <a href="https://en.wikipedia.org/wiki/Cron" rel="nofollow">cronjob</a> to run <a href="https://bitcoin.org/en/developer-reference#createrawtransaction" rel="nofollow"><code>createrawtransaction</code></a>, <a href="https://bitcoin.org/en/developer-reference#sendrawtransaction" rel="nofollow"><code>sendrawtransaction</code></a>, etc. commands monthly. Cf. "<a href="http://chimera.labs.oreilly.com/books/1234000001802/ch03.html#_creating_signing_and_submitting_transactions_based_on_phrase_role_keep_together_unspent_outputs_phrase" rel="nofollow">Creating, Signing, and Submitting Transactions Based on Unspent Outputs</a>" of <em><a href="http://chimera.labs.oreilly.com/books/1234000001802/index.html" rel="nofollow">Mastering Bitcoin</a></em>.</p>
 26913: <p>The Blockcypher Microtransaction API is free, they eat the transaction fee's for you if you're looking to send small and free transactions.</p>

<p><a href="http://dev.blockcypher.com/" rel="nofollow">http://dev.blockcypher.com/</a></p>
