bb84 Wallet

MCP server of the bb84 wallet (post-quantum hash-chain accounts on the bb84 L2, eip155:42069000; assets USDC and EURC). With the user's consent an AI assistant can read balances and transactions, propose payments the user confirms in the bb84 app, pay x402 requests, and spend from an AI budget whose size and number of payments are capped on-chain. Sign-in: OAuth 2.1 (PKCE) with confirmation in the app. x402 facilitator for the bb84-prepaid scheme: https://bb84.com/api/x402/supported