Execute Contract Calls

Batch multiple contract interactions into a single user approval using send_calls and Base MCP

What It Does

send_calls submits a batch of raw contract calls for a single Base Account approval. Use it for DeFi interactions, multi-step operations, and NFT mints that go beyond simple send or swap.

The most common use case: protocol plugins like Moonwell prepare a calls array (including token approvals and deposits), and you pass it directly to send_calls — everything executes atomically in one approval. Moonwell works entirely via web_request, with no additional MCP server required.

What You Can Ask

With the Moonwell plugin:

Find the best USDC market on Base and supply 100 USDC

Borrow 500 USDC against my collateral on Moonwell

Repay all my Moonwell debt

How It Works

1. A Plugin Prepares the Calls

   Protocol plugins like Moonwell return a calls array, often with a chain ID from their prepare endpoints. The calls include any required token approvals and the protocol interaction itself.

2. Your Assistant Calls send_calls()

   Passes the calls array and Base MCP chain name to Base MCP.

3. You Review and Approve

   Open the approval link to review all calls in Base Account before signing.

4. Calls Execute Onchain

   All calls in the batch execute atomically — if one fails, none go through.

Parameters

Parameter	Required	What it does
chain	Yes	Chain name, e.g. base, base-sepolia, ethereum, optimism, polygon, arbitrum, bsc, or avalanche
calls	Yes	Array of { to, value?, data? } objects

Related Guides

Native Plugins

Overview of the native plugins that prepare calls for Base MCP.

Sign Messages

Sign individual messages and typed data.