Idempotency Replay 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": "idempotency_replay_guard",
    "arguments": {"idempotency_key":"order-123","action":{"tool":"purchase","amount":"1000"},"prior_records":[]}
  }
}

What the agent receives

Allow-new, return-prior-result or deny decision with action hash and record template.

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