{"ok":true,"method":"POST","path":"/v0/monitor/interest","free":true,"sku":"monitor_10_usd_mo","price_usd":10,"term_days":30,"body":{"url":"https://your-endpoint.example/x402","contact":"optional@email","payto":"0x… optional listing wallet"},"paid_activate":"POST /v0/monitor/subscribe ($10 x402 USDC Base)","example":"curl -s -X POST https://api.robotsshop.io/v0/monitor/interest -H 'content-type: application/json' -d '{\"url\":\"https://example.com/x402\",\"contact\":\"ops@example.com\"}'"}