# What is the VARTA API and what can I build with it?

The VARTA HTTP API lets your application load a voice agent, hold a conversation, place telephone calls and read back what every turn decided and cost.


The VARTA API lets your own application load a conversational agent, exchange turns
with it, place and monitor telephone calls, and read an itemised record of what each
turn decided and what it cost. You author the agent once in the studio; your code
loads it and talks.

Everything here runs against **your own VARTA instance**. Set `VARTA_BASE_URL` to
your host — every example on this site reads it.