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

# YO

> View YO vaults, check positions, deposit, and request redeems through onchain reads and Base MCP send_calls.

YO Protocol is an ERC-4626 yield aggregator with async redemption. The plugin uses only onchain reads through `chain_rpc_request` and unsigned calldata submitted through Base MCP `send_calls`; no HTTP API, CLI, or allowlist is required.

**Chains:** Base, Ethereum, and Arbitrum.

**Operations:** vault listing, TVL reads, share-price reads, position checks, pending redeem checks, deposits, and redeems.

<Tip>
  YO APY is not available from onchain data. The plugin reports onchain TVL and share price, and points users to the YO dapp when they need offchain yield data.
</Tip>

## Try it

```text Vaults theme={null}
Show me the YO vaults
```

```text Position theme={null}
What's my position in yoUSD?
```

```text Deposit theme={null}
Deposit 1 USDC into yoUSD on Base
```

## Pattern

Reads use `chain_rpc_request` with `eth_call` against the vault registry. Deposits batch `approve(underlying -> Gateway, amountIn)` before `Gateway.deposit(...)`. Redeems batch a share-token approval when needed before `Gateway.redeem(...)`.

All calls use `chain` as `base`, `ethereum`, or `arbitrum`, and `value` is `0x0`. The assistant shows expected shares or assets and slippage-derived minimums before submitting `send_calls`.

## Reference

<Card title="Full plugin spec on GitHub" icon="github" href="https://github.com/base/skills/blob/master/skills/base-mcp/plugins/yo.md">
  Vault registry, calldata selectors, position aggregation, deposit and redeem mapping, and onchain-read notes.
</Card>