[jkarneges]

There are certainly "client oriented" (as opposed to webhooks) push APIs out there. However, such APIs that let you specify a starting position to read from are rare.

Sometimes APIs will give you tokens to use for resumption (e.g. SSE event IDs, or any long-polling API), but typically these are for a time-limited session rather than a stateless query against any point in a long-lived log.

Years ago, services like Friendfeed, Livefyre, and Convore had stateless long-polling APIs that returned a log of data, I believe. These kinds of APIs seem to have fallen out of fashion, though. There are still stateless long-polling APIs, but most of the ones I'm aware of don't return logs of data. For example, Dropbox and Box will let you query for a change notification against a starting position, but then you have to fetch the actual data separately.

That said, just because streaming APIs that let you set a starting position are rare doesn't mean they're impossible to make. My company (https://fanout.io) has built tools to help with this.

Edit: since you asked for a real example, Superfeedr is one such API: https://documentation.superfeedr.com/subscribers.html#stream...