create
One form, no card, no KYB. You get a workspace with a simulated EUR balance, an admin key and a first agent.
sandbox · simulated money · real tools
try nostro
in 30 seconds
Enter a work email. You get a workspace, an agent with its key and a balance of fake euros. Plug it into Claude or any MCP client and make a payment.
0workspaces
0agents
0payments
0simulated volume
live sandbox counters
sandbox only · no real funds · no kyb · privacy
your sandbox
is ready
workspace · balance
admin key
For you. Manages the workspace over MCP: create agents, set limits, approve payments. Never give it to an agent.
agent key ·
For the agent. It can only spend inside its policy. This is the one you paste into Claude.
connect your agent
how it works
connect
Paste one line into Claude Code, or the mcp.json block into any MCP client. Auth is a Bearer key: nst_…
spend
Your agent calls get_wallet, then pay. Every call is checked against its policy: settled, refused or sent to you for approval.