# vaults.fyi

> The API for DeFi yield data, transaction payloads, and portfolio tracking.

vaults.fyi is a REST API covering 1,000+ vaults across 80+ protocols on 20+ networks (Ethereum, Base, Arbitrum, Optimism, Solana, and more). It normalizes onchain data into a single consistent schema so any product can integrate DeFi yield without building protocol-by-protocol.

## What it provides

- **Market data**: Live APY rates, TVL, supported tokens, and historical performance across 80+ protocols including Aave, Morpho, Compound, Euler, Lido, ether.fi, Sky, Yearn, Pendle, and Kamino.
- **Transactions**: Ready-to-sign calldata for deposit, redeem, and claim actions. Transactions go directly to protocol smart contracts with no intermediary.
- **Portfolio tracking**: Position balances, earned yield, and transaction history for any wallet address.
- **MCP server**: An MCP-compatible server for AI agents to query live yield data, compare rates across protocols, and generate transactions within LLM workflows. Server card: `/.well-known/mcp/server-card.json`. Endpoint: `https://mcp.vaults.fyi/mcp`.
- **x402 pay-per-call**: The same API surface is available over [x402](https://docs.vaults.fyi/ai-agents/x402) on `api.vaults.fyi`, with payment-protocol auth and no API key required. Built for autonomous agents.

## Who uses it

Used by Jumper, Kraken Wallet, Maple Finance, and Gauntlet to power earn, yield comparison, and portfolio features.

## Use cases

- Wallets adding DeFi earn features
- Fintechs embedding yield into consumer or institutional apps
- Yield aggregators and portfolio managers
- AI agents and LLM tools querying live onchain yield data

## Resources

- Homepage: https://vaults.fyi
- API docs: https://docs.vaults.fyi
- API reference: https://docs.vaults.fyi/api-reference
- MCP server docs: https://docs.vaults.fyi/mcp
- x402 endpoint docs: https://docs.vaults.fyi/ai-agents/x402
- Pricing: https://vaults.fyi/api
- Blog: https://blog.vaults.fyi
- Case studies: https://docs.vaults.fyi/resources/case-studies