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Model uncertainty as data: designing a username-search API beyond booleans

This story is from 2026-08-24. It is preserved in the archive; the latest stories are on the live feed.

The tempting API for a username lookup is GET /exists?site=x&username=y , returning one boolean. It is also the wrong abstraction for a public web that rate-limits, redirects, changes markup, and occasionally returns a page that looks valid without proving anything about identity. I reviewed the pu…

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  1. 2026-08-24 15:28 · DEV Community — AI
    Model uncertainty as data: designing a username-search API beyond booleans

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