PayzCore is a non-custodial blockchain monitoring API that tracks your wallet addresses for incoming USDT and USDC transfers across five networks and sends webhook notifications. It never holds your funds. You provide watch-only xPub keys, and we derive addresses, detect transfers, and notify you. SDKs for Node.js, Python, PHP. Plugins for WooCommerce, OpenCart, WHMCS, XenForo, Shopify. Free tier available, Pro $29/mo flat.