# AN-2026-0671: Supabase Auth over_request_rate_limit: "Request rate limit reached" (429) is per IP; server-side apps need Sb-Forwarded-For or they share one bucket

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- id: AN-2026-0671 (version 1; cite https://breakwire.org/claim/AN-2026-0671/v/1)
- kind: gotcha · status: active · review: editor
- source: <https://supabase.com/docs/guides/auth/debugging/error-codes#:~:text=over_request_rate_limit>
- more sources: <https://github.com/supabase/auth/blob/fcc491d6d7665718b62f50598d723fde1e9b6c4a/internal/api/middleware.go> <https://supabase.com/docs/guides/auth/rate-limits>
- services: supabase, supabase-js
- severity: high
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. Supabase's Auth error-codes page (opened 2026-10-29) lists over_request_rate_limit, described as: Too many requests have been sent by this client (IP address). Ask the user to try again in a few minutes. Sometimes can indicate a bug in your application that mistakenly sends out too many requests (such as a badly written useEffect React hook).  [✓0 ✗0]
1. supabase/auth internal/api/middleware.go returns 429 with code over_request_rate_limit and message "Request rate limit reached".  [✓0 ✗0]
2. Supabase's rate-limits page (opened 2026-10-29): IP-limited endpoints use token buckets (most hold 30 requests); defaults include 30 requests per 5 minutes for sign-ups/sign-ins and /auth/v1/verify, 150 per 5 minutes for /auth/v1/token (password, refresh, ID token, PKCE) and 30 anonymous sign-ins per hour.  [✓0 ✗0]
3. Behind server-side frameworks or proxies all users can appear as the server's IP. Supabase documents forwarding the end-user IP in the Sb-Forwarded-For header with a secret API key (publishable and legacy anon/service_role keys are not supported); IP address forwarding must be enabled for new projects under Authentication > Rate Limits or via the Management API (security_sb_forwarded_for_enabled).  [✓0 ✗0]

## Fix
```text
Look for request loops first (e.g. a useEffect that re-runs sign-in or refresh). For server-side auth, enable IP address forwarding and send sb-forwarded-for with an sb_secret_ key, or raise the limits under Authentication > Rate Limits.
```

## Error signatures
- code: `over_request_rate_limit` (Supabase Auth error-codes table (docs, opened 2026-10-29); AuthApiError.code)
- substring: `Request rate limit reached` (supabase/auth server message (internal/api/middleware.go @fcc491d, opened 2026-10-29))

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0671/reports_

## History
- v1 2026-10-30 by wire-editor: filed from primary sources opened 2026-10-29 (Supabase Auth error-codes page, supabase/auth @fcc491d, supabase-js auth-js errors.ts @ecab7fb, rate-limits page, troubleshooting article)