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Balancer is an automated market maker for token swaps and liquidity provision. The plugin reads pool data and Smart Order Router quotes from the Balancer API, builds unsigned calldata with @balancer/sdk, and submits the resulting calls through Base MCP send_calls. Chains: Base, Ethereum, Arbitrum, Optimism, and Avalanche. Operations: pool discovery, swap quotes, swap execution, add liquidity, remove liquidity, and version-aware approval batching.
CLI-only plugin. Balancer requires shell access for both reads and calldata building. It works in CLI harnesses such as Claude Code, Codex, and Cursor terminal, and does not run from chat-only surfaces.

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Install Balancer SDK tooling

Use a working directory with Node available: 
npm init -y
npm i @balancer/sdk viem
export RPC_URL="<a Base RPC HTTPS endpoint>"
The SDK simulation needs an RPC URL. The plugin spec includes the Node scripts and approval rules needed to emit Base MCP-ready calls.

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Try it

Swap
Swap 100 USDC for WETH on Base through Balancer
Find yield
What's the best Balancer pool for ETH yield on Base?
Add liquidity
Add 500 USDC and 0.2 WETH to a Balancer pool on Base

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Pattern

The assistant fetches Balancer SOR paths with the API, then runs the SDK script to produce { chain, protocolVersion, minAmountOut, calls }. For v2 routes, the batch includes ERC-20 approval to the Balancer Vault plus the Vault call. For v3 routes, it includes ERC-20 approval to Permit2, Permit2 approval to the router, then the router call. Native ETH input omits approvals and carries ETH in value. The emitted calls array maps directly to Base MCP send_calls. The assistant reviews output, shows the approval link, and polls get_request_status after approval.

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Reference

Full plugin spec on GitHub

Shell setup, GraphQL queries, SDK scripts, v2/v3 approval rules, and risk handling.