> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ranger.finance/llms.txt
> Use this file to discover all available pages before exploring further.

# DeFi Protocol Overview

> The Ranger Earn protocol architecture — vaults, adaptors, and fund flow

The Ranger Earn protocol consists of two main programs that enable customizable yield strategies.

## Vault (`voltr-vault program`)

Vaults are the primary user interface, managing deposits and handling the accounting of user shares. When a vault manager allocates funds to a strategy, the vault program calls the adaptor via CPI.

## Adaptor (custom on-chain program)

An adaptor is a Solana program that bridges a Voltr vault with a DeFi protocol. The vault program calls into the adaptor, and the adaptor routes those calls to the target protocol via CPI.

Adaptors:

* Implement three standardized instructions: **initialize**, **deposit**, and **withdraw**
* Act as a CPI translation layer between the vault and the target protocol
* Report position values back to the vault (deposit/withdraw return `u64`)
* Handle protocol-specific account setup and token conversions

## Fund Flow

```
User deposits → Vault holds idle assets
                  ↓ (manager allocates)
              Vault calls Adaptor via CPI
                  ↓
              Adaptor calls Target Protocol via CPI
                  ↓
              Protocol holds assets, issues receipt tokens
                  ↓
              Adaptor reports position value back to Vault
```

## Integration Paths

<CardGroup cols={2}>
  <Card title="Build an Adaptor" icon="puzzle-piece" href="/protocols/adaptor-creation/index">
    Build a custom adaptor to connect your protocol to Voltr vaults
  </Card>

  <Card title="CPI Integration" icon="code" href="/protocols/cpi-integration/index">
    Deposit into and withdraw from Voltr vaults on-chain via CPI
  </Card>
</CardGroup>