> ## 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.

# Hydrex

> Swaps and concentrated-liquidity position management on Hydrex via prepare-server calldata and Base MCP send_calls.

Hydrex is an Omni-Liquidity MetaDEX on Base. The plugin calls the Hydrex prepare server for quotes, portfolio state, pool data, and unsigned transaction calldata, then submits swaps and liquidity actions through Base MCP `send_calls`.

**Chain:** Base mainnet.

**Operations:** swap quotes, swaps, position reads, pool discovery, add liquidity, remove liquidity, and portfolio summaries.

<Tip>
  On chat-only surfaces, the Hydrex prepare server may require a user-paste fallback: the assistant constructs a full GET URL, the user opens it, and the pasted JSON is mapped into `send_calls`.
</Tip>

## Try it

```text Swap theme={null}
Swap 5 USDC for ETH on Hydrex
```

```text Positions theme={null}
Show my Hydrex liquidity positions
```

```text Add liquidity theme={null}
Add liquidity to the USDC/ETH pool on Hydrex: 100 USDC and 0.04 ETH
```

## Pattern

Prepare endpoints return a `transactions[]` array. The assistant maps every transaction into one Base MCP `send_calls` batch with `{ to, value, data }` and `chain: "base"`. Approvals and actions stay in response order so the batch executes atomically.

Reads and prepare calls need the user's wallet address as `from` or `recipient`. For liquidity actions, the assistant shows tick range, amounts, and position details before asking for approval.

## Reference

<Card title="Full plugin spec on GitHub" icon="github" href="https://github.com/base/skills/blob/master/skills/base-mcp/plugins/hydrex.md">
  State endpoints, prepare endpoints, position handling, transaction mapping, and chat-only fallback.
</Card>