# On-Chain Costs

The **APRO VRF random number request fee** consists of **off-chain service costs** and **target chain gas fees**. Payment is made using **Valueless\_Test tokens** (a purely functional settlement unit).

The system dynamically optimizes fees based on the **real-time status of each blockchain network** and may offer **temporary gas subsidies or service discounts**.

All **fee details are publicly verifiable on-chain**.

**For more information on on-chain costs, please contact us via:**

* Email: <bd@apro.com>
* Telegram: [Head of Business Development](https://t.me/Annie_LLLEEE)

**You can pay service fees using the following tokens:**&#x20;

* **Native blockchain gas tokens** and their **ERC20-wrapped** versions.