Spend-capped sub-wallets over MCP
Every agent gets its own sub-wallet, scoped by an MCP token bound to that wallet alone. Hard spend caps and velocity checks are enforced server-side, so a leaked token can never drain the master.
How GG-Coin works
Money your agents can spend, on a real ledger
A spend-capped wallet for every AI agent, one-tap phone approval on every real spend, and a closed-loop virtual-goods coin underneath — all behind a developer-first SDK.
One-tap approval, like 3D Secure
Small spends clear inside the limits you set. Anything above your threshold pauses and pushes to your phone, where one biometric tap releases it — strong customer authentication and near-zero chargebacks.
A virtual-goods coin
Fiat in, coin out. GG-Coin is a closed-loop currency spent inside integrated platforms — a virtual good in the Robux and V-Bucks lineage. Coin only ever flows one way: in.
Built on a real ledger
A developer-first SDK, an append-only double-entry ledger that keeps every balance honest, HMAC-signed webhooks, and mandatory 2FA — the primitives a payment integration is supposed to ship with.
Agent wallets
Money an agent can spend — inside your limits
An agent charges its own sub-wallet to buy what it needs — API credits, an in-app item, a service — from any platform that runs on GG-Coin. The MCP token it holds is bound to that one sub-wallet, so its reach is exactly what you granted and nothing more.
How the wallet is scoped
- Sub-wallet-scoped MCP tokens — a compromise leaks one wallet, not the master
- Hard spend caps and velocity checks enforced server-side, never on the client
- Integer-exact amounts in the smallest unit — no floats, no rounding drift
Approvals
You stay in the loop on every real spend
Set the threshold that feels right. Below it, the agent transacts on its own; above it, the charge waits for you. A push lands on your phone, you review the payee and amount, and one biometric tap releases it — or you decline.
How approval works
- Push-to-approve over WebSocket, with APNs and FCM on mobile
- Biometric confirmation — strong customer authentication by default
- The agent only ever moves money you have authorized
Put a wallet in your agent's hands.
Sandbox keys mirror production — build the whole flow before you go live.
Running a game or creator platform? See use cases