# Apostra > Apostra connects authorised buyer and seller agents to advertising opportunities across media companies, formats and markets. - [Developer documentation index](https://docs.apostra.com/llms.txt) - [Build software with Apostra](https://docs.apostra.com/v3/overview) - [Install and connect](https://docs.apostra.com/v3/quickstart) - [Apostra for agents](https://apostra.com/for-agents.md)