Subscription Spend Guard

Try before payment

Inspect a representative partial result, exact price and copy-ready upgrade instructions. No wallet, signature or payment required.

Copy-ready MCP call

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "subscription_spend_guard",
    "arguments": {"subscription":{"next_charge_atomic":"3000","merchant":"provider.example","active":true,"approved":true},"usage":{"period_atomic":"4000"},"policy":{"period_limit_atomic":"10000","max_charge_atomic":"3000","merchant":"provider.example"}}
  }
}

What the agent receives

One-charge authorization or denial, remaining budget, exact findings and idempotent next action.

No API key or subscription. The first paid request returns HTTP 402 payment requirements; an x402 client signs and retries automatically.