# Primary Lottery Mechanics

### **Participation:**

* **Entry Requirements:** Users must have 10 USDC to participate.
* **Approval Process:** Users need to approve the lottery contract to access their USDC.
* **Lottery Entry:** After approval, users click the "Enter with 10 USDC" button. This sends 10 USDC to the lottery contract, increasing the number of participants in the lottery.

<figure><img src="/files/hkO54B2yGMJNVwnYXIqo" alt=""><figcaption></figcaption></figure>

### **Winner Selection:**

* **ChainLink VRF Integration:** Once the final participant enters the lottery, the ChainLink VRF (Verifiable Random Function) is triggered to select the winner randomly.
* **Settlement:** The `settleLottery()` function is automatically called by an in-house bot. This function finalizes the lottery and transfers the winnings to the winner's wallet.\
  \- **Manual Settlement:** If the bot fails to execute the settlement, any user can manually settle the lottery by invoking the `settleLottery()` function through the smart contract interface on PolygonScan.

### **Rewards Distribution:**

* **Winners:** The selected winner receives the total prize in USDC.
* **Losers:** Participants who do not win are minted loserUSDC tokens, which are non-transferable and can only be used for entry into the Second Chance Lottery.


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