wallet_balance

What your wallet holds in USDC on Base. Says so plainly when the chain could not be reached, because that is not the same as holding nothing

Free. This one only touches this instance's own storage, so there is nothing to charge for.

Runs on Wallet — A key of your own on Base: an address to hold USDC, what it holds, and paying for a tool on another server with it.

Calling it

Three doors onto the same method. MCP is what an agent speaks, REST is what a program speaks, and the answer is identical.

{"id":1,"jsonrpc":"2.0","method":"tools/call","params":{"arguments":{},"name":"wallet_balance"}}

Try it in the playground.