Lulo Development Guide

A comprehensive guide for integrating Lulo, Solana's only lending aggregator, into your applications. Lulo automatically routes deposits to the highest-yielding DeFi protocols while providing optional smart contract protection.

What is Lulo?

Lulo (formerly FlexLend) is a DeFi savings platform for stablecoins on Solana. It automatically allocates deposits across integrated protocols to maximize yields while maintaining desired risk exposure.

Key Features

Why Use Lulo?

• Automated Rebalancing: Checks rates hourly, automatically moves funds to better yields
• Risk Management: Choose between Protected (insured), Boosted (higher yield), or Custom deposits
• Zero Management Fees: Only 0.005 SOL one-time initialization fee
• Multi-Reward Accrual: Earn rewards from multiple protocols from a single deposit
• 9,400+ Lifetime Depositors with $34M+ in directed liquidity

Overview

Lulo provides three deposit types:

• Protected Deposits: Stable yields with automatic coverage against protocol failures
• Boosted Deposits: Higher yields by providing insurance for Protected deposits
• Custom Deposits: Direct control over which protocols receive your funds

Integrated Protocols

Supported Tokens

• Stablecoins: USDC, USDT, USDS, PYUSD
• Native: SOL
• LSTs: bSOL, JitoSOL, mSOL
• Other: BONK, JUP, ORCA, COPE, CASH

Minimum Deposits: $100 for stablecoins, 1 SOL for native token

Quick Start

API Authentication

All API requests require a valid API key. Get your key from the Lulo Developer Dashboard.

const headers = {
  'Content-Type': 'application/json',
  'x-api-key': process.env.LULO_API_KEY,
};

Base URLs

API Reference

Generate Deposit Transaction

Creates a serialized transaction for depositing tokens into Lulo.

Endpoint: POST /v1/generate.transactions.deposit

Query Parameters:

Request Body:

{
  "owner": "YourWalletPublicKey",
  "mintAddress": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
  "depositType": "protected",
  "amount": 100000000
}

Response:

{
  "transaction": "base64EncodedSerializedTransaction",
  "lastValidBlockHeight": 123456789
}

Generate Withdrawal Transaction

Creates a serialized transaction for withdrawing tokens from Lulo.

Endpoint: POST /v1/generate.transactions.withdraw

Query Parameters:

Request Body:

{
  "owner": "YourWalletPublicKey",
  "mintAddress": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
  "withdrawType": "protected",
  "amount": 50000000
}

Get Account Data

Retrieves user balances, interest earned, and APY metrics.

Endpoint: GET /v1/account/{walletAddress}

Response:

{
  "totalDeposited": 1000000000,
  "totalInterestEarned": 5000000,
  "currentApy": 8.5,
  "positions": [
    {
      "mint": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "depositType": "protected",
      "balance": 500000000,
      "interestEarned": 2500000,
      "apy": 7.2
    }
  ]
}

Get Pool Data

Returns current APY rates, liquidity amounts, and capacity metrics.

Endpoint: GET /v1/pools

Response:

{
  "pools": [
    {
      "mint": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "symbol": "USDC",
      "protectedApy": 6.5,
      "boostedApy": 9.2,
      "totalDeposited": 34000000000000,
      "availableCapacity": 10000000000000
    }
  ]
}

Get Pending Withdrawals

Lists active withdrawal requests with cooldown periods.

Endpoint: GET /v1/account/{walletAddress}/pending-withdrawals

Initialize Referrer

Sets up a referrer account for earning referral fees.

Endpoint: POST /v1/referrer/initialize

Claim Referral Rewards

Processes referral fee claims.

Endpoint: POST /v1/referrer/claim

Deposit Types Explained

Protected Deposits

Designed for risk-averse users seeking stable yields with automatic coverage.

How it works:

1. Deposits earn interest from lending across integrated protocols
2. A portion of interest is shared with Boosted depositors (protection fee)
3. If a protocol fails, Boosted deposits cover Protected losses automatically

Benefits:

• Lower risk with priority coverage
• Stable, predictable yields
• No claims to file - protection is automatic
• Instant withdrawals

Coverage includes: Smart contract exploits, oracle failures, bad debt events

Not covered: Solana network failures, USDC depegging, Lulo contract failures

Boosted Deposits

Higher yields in exchange for providing insurance to Protected depositors.

How it works:

1. Earn lending yields from integrated protocols
2. Receive additional yield from Protected deposit interest sharing
3. Act as first-loss layer if a protocol fails

Benefits:

• Higher APY (typically 1-2% more than Protected)
• Dual income streams (lending + protection fees)

Risks:

• First-loss position in case of protocol failures
• 48-hour withdrawal cooldown

Custom Deposits

Full control over protocol allocation and risk parameters.

Features:

• Select specific protocols (Kamino, Drift, MarginFi, Jupiter)
• Set maximum exposure caps per protocol
• Automatic reallocation when yields change
• No protection coverage (direct protocol exposure)

Example: 50% max exposure with 3 protocols means no more than half your funds in any single protocol.

Integration Examples

TypeScript: Deposit to Lulo

import { Connection, Transaction, VersionedTransaction, Keypair } from '@solana/web3.js';

const LULO_API_URL = 'https://api.lulo.fi';

interface DepositParams {
  owner: string;
  mintAddress: string;
  amount: number;
  depositType: 'protected' | 'boosted' | 'regular';
  priorityFee?: number;
}

async function generateDepositTransaction(params: DepositParams): Promise<string> {
  const { owner, mintAddress, amount, depositType, priorityFee = 500000 } = params;

  const response = await fetch(
    `${LULO_API_URL}/v1/generate.transactions.deposit?priorityFee=${priorityFee}`,
    {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'x-api-key': process.env.LULO_API_KEY!,
      },
      body: JSON.stringify({
        owner,
        mintAddress,
        depositType,
        amount,
      }),
    }
  );

  if (!response.ok) {
    throw new Error(`Deposit failed: ${response.statusText}`);
  }

  const data = await response.json();
  return data.transaction;
}

async function deposit(
  connection: Connection,
  wallet: Keypair,
  mintAddress: string,
  amount: number,
  depositType: 'protected' | 'boosted' | 'regular' = 'protected'
): Promise<string> {
  // Generate deposit tr