defi-mcp
An MCP (Model Context Protocol) server that gives AI agents direct, on-chain access to DeFi data on EVM chains — wallet balances, Aave v3 lending positions, and live token prices, with no centralized API in the middle.
Status: Live and functional. 5 tools available today, more on the roadmap.
Why
Most "DeFi + AI" integrations route through a centralized API that can rate-limit, paywall, or simply disappear. defi-mcp talks directly to the chain (via your own RPC provider) and to first-party oracles (Chainlink), so the data your AI agent gets is exactly what's on-chain — verifiable, and not dependent on a third-party API staying online.
get_token_balance
Reads the ERC-20 balance of any wallet address for a supported token.
Supported tokens:
- Polygon:
USDC, USDC.e, USDT, WETH, WMATIC, WBTC, DAI, AAVE
- Arbitrum:
USDC, USDC.e (bridged), USDT, WETH, WBTC, ARB
{
"address": "0x...",
"token": "USDC",
"chain": "polygon",
"balance": 268.21,
"raw_balance": "268210000",
"decimals": 6
}
get_aave_position
Reads a user's full Aave v3 lending/borrowing position: collateral, debt, available borrowing power, and health factor — straight from the Aave v3 Pool contract.
{
"address": "0x...",
"chain": "polygon",
"total_collateral_usd": 969.78,
"total_debt_usd": 288.16,
"available_borrows_usd": 484.86,
"liquidation_threshold_pct": 82.79,
"ltv_pct": 79.71,
"health_factor": 2.79,
"has_active_position": true
}
A health_factor below 1.0 means the position is at risk of liquidation. A null health factor means the user has no outstanding debt.
get_token_price
Reads the current USD price of a token directly from a Chainlink price feed — the same oracle DeFi protocols use internally, so the price is consistent with what get_aave_position reports.
Supported feeds:
- Polygon:
ETH/WETH, MATIC/WMATIC, WBTC, USDC, USDT
- Arbitrum:
ETH/WETH, WBTC, ARB, USDC, USDT
{
"token": "WBTC",
"chain": "polygon",
"price_usd": 63835.77,
"decimals": 8,
"updated_at": 1782032816
}
simulate_swap
Simulates a Uniswap v3 swap on-chain via the QuoterV2 contract — no transaction submitted, no wallet needed. Tries all four fee tiers (0.01%, 0.05%, 0.3%, 1%) and returns the best available output amount.
Supported tokens:
- Polygon:
USDC, USDC.e, USDT, WETH, WMATIC, WBTC, DAI, AAVE
- Arbitrum:
USDC, USDC.e (bridged), USDT, WETH, WBTC, ARB
{
"chain": "polygon",
"token_in": "WMATIC",
"token_out": "USDC",
"amount_in": 100.0,
"amount_out": 7.990547,
"fee_tier_used_pct": 0.05,
"fee_tier_used_bps": 500,
"gas_estimate": 122770
}
If no pool exists for the pair at any fee tier, returns {"error": "No liquidity found for this pair on any fee tier"}.
hello
Simple connectivity check — confirms the MCP server is reachable and responding.
Supported chains
| Chain | get_token_balance | get_aave_position | get_token_price | simulate_swap |
|---|
| Polygon | ✅ | ✅ | ✅ | ✅ |
| Arbitrum | ✅ | ✅ | ✅ | ✅ |
Installation
Requires Python 3.10+ and an RPC provider API key (e.g. Alchemy, free tier works).
Create a .env file in your working directory (see .env.example):
POLYGON_RPC_URL=https://polygon-mainnet.g.alchemy.com/v2/YOUR_API_KEY
ARBITRUM_RPC_URL=https://arb-mainnet.g.alchemy.com/v2/YOUR_API_KEY
Each chain only needs its RPC URL configured. Tools called with chain="arbitrum" will fail gracefully if ARBITRUM_RPC_URL is not set.
Usage with Claude Desktop
Add this to your Claude Desktop MCP config (claude_desktop_config.json):
{
"mcpServers": {
"defi-mcp": {
"command": "uvx",
"args": ["defi-mcp"],
"env": {
"POLYGON_RPC_URL": "https://polygon-mainnet.g.alchemy.com/v2/YOUR_API_KEY",
"ARBITRUM_RPC_URL": "https://arb-mainnet.g.alchemy.com/v2/YOUR_API_KEY"
}
}
}
}
Restart Claude Desktop, and the tools above will be available to the model.
Testing locally
You can test the server directly with the official MCP Inspector:
npx @modelcontextprotocol/inspector uvx defi-mcp
Roadmap
Architecture
Open-core model: this repository (MIT licensed) covers standard on-chain read tools. A separate defi-mcp-cloud will offer a hosted version with MEV-related tools, request caching, and managed RPC access for users who don't want to run their own infrastructure.
Resources
- defi-storage-cheatsheet — verified EVM storage slot layouts for Aave v3 and Uniswap v3, with
web3.py snippets. Useful if you want to read on-chain state directly via eth_getStorageAt instead of calling view functions — the lower-level approach behind some of what this server does under the hood.
Contributing
Issues and PRs welcome. This is an early-stage project — feedback on what tools would actually be useful to you is especially valuable.
License
MIT