Flash Loan Simulator

Simulate and analyze flash loan strategies including arbitrage, liquidations, and collateral swaps across major DeFi protocols.

Features

• Strategy Simulation - Model complex multi-step flash loan transactions
• Profitability Analysis - Calculate net profit after all fees and costs
• Risk Assessment - Identify execution risks and competition levels
• Protocol Support - Aave V3, dYdX, Balancer, Uniswap V3
• Gas Optimization - Estimate gas costs and optimize strategies
• Historical Testing - Backtest strategies against historical data

Installation

/plugin install flash-loan-simulator@claude-code-plugins-plus

FREE RPC Endpoints: No Alchemy Required

Run flash loan simulations using free public RPC endpoints - no Alchemy subscription needed.

Quick Comparison

Annual Savings: $588-2,388 for flash loan development.

Why Free RPCs Work for Flash Loan Simulations

Simulation Requirements:

• Read blockchain state (getBlock, getTransaction, call)
• Query DeFi protocol data (Aave, Uniswap, Balancer)
• Gas estimation (estimateGas)
• Historical data for backtesting

Free RPCs provide:

• 25-100 requests/second (more than enough for simulations)
• Archive node access (historical data)
• Multi-chain support (Ethereum, Polygon, Arbitrum)
• 99.9% uptime

You DON'T need Alchemy's premium features for simulations (webhooks, NFT API, trace API are for production, not testing).

Free RPC Provider Catalog

1. Ankr (Best for Multi-Chain)

What: Public RPC endpoints for 15+ chains

Limits:

• Ethereum: 30 requests/second
• No rate limits on queries
• Archive data available

Setup:

{
  "rpcEndpoint": "eth"
}

Cost: $0 (no API key required)

Chains: Ethereum, Polygon, Arbitrum, Optimism, BSC, Avalanche

2. Infura Free Tier

What: Free tier with 100K requests/day

Limits:

• 100,000 requests/day (sufficient for development)
• 10 requests/second
• Requires free account (no credit card)

Setup:

{
  "rpcEndpoint": "https://mainnet.infura.io/v3/YOUR_FREE_KEY"
}

Get Free Key: infura.io/register (no payment required)

Cost: $0 (free tier)

3. Chainstack Free Plan

What: 3M requests/month free

Limits:

• 3,000,000 requests/month
• 25 requests/second
• Free account (no card)

Setup:

{
  "rpcEndpoint": "https://nd-XXX-XXX-XXX.p2pify.com/YOUR_FREE_KEY"
}

Get Free Key: chainstack.com/pricing

Cost: $0 (free plan)

4. Public Ethereum RPC (Fastest Setup)

What: Community-run public endpoints

Limits:

• Variable rate limits
• May be slower during peak times
• No signup required

Setup:

{
  "rpcEndpoint": "https://eth.llamarpc.com"
}

Cost: $0 (completely free)

Alternatives:

• https://ethereum.publicnode.com
• https://cloudflare-eth.com
• https://rpc.flashbots.net (MEV-protected)

Configuration with Free RPCs

Option 1: Ankr (Recommended - No Signup)

{
  "protocols": {
    "aave": { "enabled": true, "fee": 0.0009 },
    "dydx": { "enabled": true, "fee": 0 },
    "balancer": { "enabled": true, "fee": 0.001 }
  },
  "simulation": {
    "slippageTolerance": 0.01,
    "gasPrice": "auto",
    "minProfitUSD": 50
  },
  "rpcEndpoint": "eth"
}

Cost: $0 (vs Alchemy $49/mo)

Option 2: Infura Free Tier (Best Features)

{
  "rpcEndpoint": "https://mainnet.infura.io/v3/YOUR_FREE_KEY"
}

Setup Steps:

1. Sign up at infura.io (free, no card)
2. Create project
3. Copy API key
4. Paste into config

Cost: $0 for 100K requests/day

Option 3: Multi-Chain Setup (All Free)

{
  "networks": {
    "ethereum": "eth",
    "polygon": "polygon",
    "arbitrum": "arbitrum",
    "optimism": "optimism"
  }
}

Cost: $0 across all chains

Cost Comparison: Flash Loan Development

Paid Approach (Alchemy)

Annual Subscriptions:

• Alchemy Growth: $49/mo → $588/year
• Alchemy Scale: $199/mo → $2,388/year (if high usage)

Advantages:

• 660 requests/second
• Advanced analytics dashboard
• Dedicated support

Free Approach (Public RPCs)

Annual Subscriptions:

• Ankr: $0
• Infura free tier: $0
• Public RPCs: $0
• Total: $0/year

Advantages:

• 25-100 requests/second (sufficient for simulations)
• Archive data for backtesting
• No rate limit concerns for development

Savings: $588-2,388/year with identical simulation quality.

Real Use Case Examples

Flash Loan Arbitrage Simulation

const { ethers } = require('ethers');

// Before (Alchemy - Paid)
const provider = new ethers.providers.JsonRpcProvider(
  `https://eth-mainnet.g.alchemy.com/v2/${ALCHEMY_KEY}`  // $49-199/mo
);

// After (Ankr - FREE)
const provider = new ethers.providers.JsonRpcProvider(
  'eth'  // $0/mo
);

// Same simulation capability, zero cost
const uniswapPrice = await uniswapContract.getAmountsOut(...);
const sushiswapPrice = await sushiswapContract.getAmountsOut(...);
const profit = calculateArbitrage(uniswapPrice, sushiswapPrice);