We can build polling services in OSB

OSB is fundamentally designed for request/response and publish-subscribe messaging patterns. While it can consume services from polling endpoints, OSB itself is not a polling framework - it is primarily invoked synchronously or asynchronously. True polling services (where OSB actively polls external sources on a schedule) typically require external triggers or require the use of a separate scheduling mechanism. The framework is event/message-driven, not poll-driven, making the statement that polling services can be built directly in OSB incorrect.