# Chat ## Determine if an address is marked as source of spam - [GET /xmtp/spam/{address}](https://docs.unstoppabledomains.com/apis/messaging-v1/openapi/chat/paths/~1xmtp~1spam~1%7Baddress%7D/get.md): The provided address is cross referenced against algorithms to suggest whether it has generated spam messages ## Accept an XMTP chat request - [POST /xmtp/topics/accept](https://docs.unstoppabledomains.com/apis/messaging-v1/openapi/chat/paths/~1xmtp~1topics~1accept/post.md): New XMTP chats are not show in the Unstoppable Messaging inbox by default. After a topic is accepted by the user, it is shown in the default view. ## Block an XMTP conversation - [POST /xmtp/topics/block](https://docs.unstoppabledomains.com/apis/messaging-v1/openapi/chat/paths/~1xmtp~1topics~1block/post.md): Block the specified XMTP topics and report as spam ## Register an XMTP topic for mobile push notifications - [POST /xmtp/topics/register](https://docs.unstoppabledomains.com/apis/messaging-v1/openapi/chat/paths/~1xmtp~1topics~1register/post.md): Handles registration of XMTP topics to associate with mobile device tokens to receive push notifications