user109336: How I can depend on a transaction to an unconfirmed transaction?
How much does it cost?
Do I need to use a specific API or application?
Thank you

user26873: 
How I can depend on a transaction to an unconfirmed transaction?

In order for a transaction to "depend" on an unconfirmed transaction is simply the act of creating and broadcasting a transaction that uses UTXOs that are unconfirmed and not yet in a block. Most wallets don't let you do this.

How much does it cost?

There are a lot of factors that can affect the cost of a transaction, but assuming you aren't doing anything weird the cost of the transaction should be roughly the same as any other transaction.

Do I need to use a specific API or application?

I don't believe API's will let you do this... The action you are describing is usually done by developers who build the raw transactions to test wallets and other cases.

109336: <p>How I can depend on a transaction to an unconfirmed transaction?</p>
<p>How much does it cost?
Do I need to use a specific API or application?</p>
<p>Thank you</p>
 26873: <blockquote>
<p>How I can depend on a transaction to an unconfirmed transaction?</p>
</blockquote>
<p>In order for a transaction to &quot;depend&quot; on an unconfirmed transaction is simply the act of creating and broadcasting a transaction that uses UTXOs that are unconfirmed and not yet in a block. Most wallets don't let you do this.</p>
<blockquote>
<p>How much does it cost?</p>
</blockquote>
<p>There are a lot of factors that can affect the cost of a transaction, but assuming you aren't doing anything weird the cost of the transaction should be roughly the same as any other transaction.</p>
<blockquote>
<p>Do I need to use a specific API or application?</p>
</blockquote>
<p>I don't believe API's will let you do this... The action you are describing is usually done by developers who build the raw transactions to test wallets and other cases.</p>
