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

# aPriori

> aprMON liquid staking - ERC4626 vault with auto-compounding staking rewards

<Info>
  **TVL:** \~\$48M | **Type:** Liquid Staking | **Docs:** [apr.io](https://apr.io)
</Info>

## Overview

aPriori is the largest liquid staking protocol on Monad by TVL. Users deposit MON and receive **aprMON**, an ERC4626 vault token whose exchange rate increases continuously as staking rewards accrue. There is no manual claim step - rewards are automatically reflected in the aprMON/MON rate.

The aPriori pool contract acts as both the ERC4626 vault and the staking manager. The `previewRedeem` function gives the current redemption rate without any gas cost.

## Functions

### getAPrioriLST()

Returns the full `LSTStats` snapshot for aprMON.

```typescript theme={null}
import { Rampart } from 'rampart-monad'

const sdk = new Rampart()
const lst = await sdk.getAPrioriLST()
// → LSTStats

console.log(`aprMON APR: ${(lst.apr * 100).toFixed(2)}%`)
console.log(`Exchange rate: 1 MON = ${lst.exchangeRate} aprMON`)
console.log(`TVL: $${(lst.tvl / 1e6).toFixed(1)}M`)
```

### getAPrioriExchangeRate()

Returns the current aprMON/MON exchange rate as a plain number. This is derived from `previewRedeem(1e18)` on the pool contract.

```typescript theme={null}
const rate = await sdk.getAPrioriExchangeRate()
// → number, e.g. 1.082

console.log(`1 aprMON redeems for ${rate.toFixed(4)} MON`)
```

### getAPrioriTVL()

Returns the total MON deposited into the aPriori pool, denominated in USD using the current MON price.

```typescript theme={null}
const tvl = await sdk.getAPrioriTVL()
// → number (USD)

console.log(`aPriori TVL: $${(tvl / 1e6).toFixed(1)}M`)
```

### getStakingAPR()

Returns a `StakingAPR` object with the annualized percentage rate for aprMON computed from the exchange rate delta over the last 500k blocks (\~56 hours on Monad).

```typescript theme={null}
import { getStakingAPR } from 'rampart-monad'

const apr = await getStakingAPR('apriori')
// → { token: 'aprMON', apr: 0.08, basis: 'exchange-rate-delta', protocol: 'apriori' }

console.log(`APR: ${(apr.apr * 100).toFixed(2)}%`)
```

## Contract Addresses

| Contract                   | Address                                      |
| -------------------------- | -------------------------------------------- |
| aprMON token / aPrioriPool | `0xb2f82D0f38dc453D596Ad40A37799446Cc89274A` |

<Note>
  The aprMON token address and the aPriori pool address are the same contract - it is a unified ERC4626 vault.
</Note>