One key works in Claude, Cursor, VS Code and any MCP client. Priced calls are paid from a prepaid balance, with no wallet step per call.
First time here? A 5-minute lesson: from a free call to paying with a key ↗
No email, no password. The key starts at $0; while the balance is empty, the free calls still apply.
Save it now: it is shown only once. Anyone with this key can spend its balance.
Paste the line for your client. The key travels in the connection header, so the model never sees it.
Then ask: “What is the weather in Berlin right now?”
No key yet? The same URL without the header works on the free calls.
From a browser wallet (MetaMask, Coinbase Wallet, Rabby…) holding USDC on Base and a few cents of ETH for gas. Two prompts: sign, then send. The credit lands on this key seconds after the transaction.
The balance is prepaid credit on this hub and is spent only on calls made with your key. Every movement: GET /ai-market/v2/account/ledger with the same key. Unused credit is not refunded automatically.