# 📊 Usage and Cost

Usage is measured in **Compute Units (CU)**.\
Each **user action** parsed and returned by the API is counted as **1 CU**.

* **What is a user action?**\
  A decoded on-chain activity such as:
  * `swap`
  * `add_liquidity`
  * `supply`
  * `borrow`
  * `stake`
  * …

### API/Websocket Usage & Cost

API/Websocket usage is measured in **Compute Units (CU)**.

* **1 user action = 1 CU**
* For API called, if transaction/block has 0 decoded user action, **1 CU is deducted**

**Examples:**

* A decoded transaction with **3 user actions = 3 CUs**
* A decoded block with **150 user actions = 150 CUs**
* Receiving an event message via Websocket including **100 actions = 100 CUs**

###

**Examples:**

* Block with 150 actions (last 30 days) = **150 CU**


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