Check username availability

documented

Check whether a proposed username is valid and available for registration.

GET /auth/username-checkAuthno implementation yet0 runs

Runs (30 d)

Success rate

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p50 latency

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p95 latency

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Distinct callers

Runs per day

No run in the last 30 days.

Every run is logged with a redacted input and an anonymised output shape. Stages promote automatically: developed after one good run, tested when benchmarks pass, reliable at ≥97% over 30 days across several callers.