As someone who spent five minutes writing a pinboard client for my own personal use [1], it was frustrating that there was no way of testing these kinds of cases since even a test account would require extra payment. If pinboard were to pivot to a more api-friendly service, having some kind of test account(s) would be high on my wishlist.

[1] Almost the only feature is to prefill things like title, description, etc. because I wasted so much time, when using pinboard, viewing source and copying these manually.

Thanks for this good idea. I'll think up some way to have test accounts for devs when the new API drops.

37000 should be fine. Try changing the device’s auto-lock setting to 5 mins and leave it undisturbed for that amount of time for the initial download to go through. I’ve got a few users with 100000 bookmarks.

This support article for Pins would give a bit more detail: https://get-pins.app/posts/pinboard-sync-v1/