Give your assistant a wallet

Add Coinbase's wallet to Claude Desktop, Claude Code, Codex, or Gemini CLI, and your assistant pays datasets per question in USDC, within your limits.

A paid dataset charges its price for each question, in USDC on Base. Your assistant can pay it from a wallet of its own: Coinbase's wallet adds itself to your assistant as a tool, holds your USDC, and pays for each question the assistant asks, within the spending limits you set. You need no quarry account, and payments are final: an answered question can't be refunded.

The wallet is Coinbase's service, under Coinbase's terms, and it sends each paid question through Coinbase's servers. quarry never holds the wallet, its keys, or its money.

The wallet runs on your computer, beside Claude Desktop, Claude Code, Codex, or Gemini CLI. ChatGPT and Claude on the web can't run it: there, use free datasets or a subscription.

Install the wallet

In a terminal, with Node.js 22 or later:

npx @coinbase/payments-mcp

The installer asks which assistant you use and adds the wallet to it. To skip the question, name the assistant: claude for Claude Desktop, claude-code, codex, or gemini.

npx @coinbase/payments-mcp --client claude-code --auto-config

Then restart your assistant, or start a new session, so it loads the wallet.

Ask your assistant to open your wallet. In the window that opens, sign in with your email address and the 6-digit code Coinbase sends you. Your first sign-in creates the wallet.

Add USDC

The wallet pays in USDC on Base and needs nothing else: the network fee of each payment is paid for you. Add USDC from the wallet window, or send USDC on Base to the wallet's address from an exchange or another wallet. Your assistant can tell you the address and the balance.

Set your limits

Set your spending limits in the wallet window. The wallet holds every payment to them, and your assistant has no tool to change them. The wallet can also send and trade what it holds when your assistant asks, so keep in it only what you're ready to spend.

Ask a paid dataset

Connect quarry to the same assistant: see Coding agents, or Chat assistants for Claude Desktop. Then ask as usual. When a dataset is paid per question, quarry gives your assistant its price and its address, and your assistant can pay there with the wallet.

When your assistant is connected to your quarry account, or sends one of your API keys, each question it pays this way is listed on your Purchases page: what quarry prepares for the wallet carries a code that names your account, for that question only. See Your purchases.

You can also name the dataset yourself. Its address is on its public page, in the HTTP tab under Connect:

Use my wallet to ask https://quarry.market/alice/market-outlook this question:
Which segment grew fastest?

Your assistant then pays without asking quarry first, so the question carries no account and isn't listed on your Purchases page.

Each question costs the dataset's price, and nothing when no passage answers it: see What you pay for.

If something goes wrong

Your assistant has no wallet tools: restart it after installing, or run the installer again.
The wallet says you're not signed in: ask your assistant to open the wallet, then sign in again.
The payment is refused: check that the wallet holds enough USDC on Base and that the price is within your spending limits.
quarry says no passage answers the question: nothing was charged. Rephrase it, or try another dataset.