---
title: "Start Sign in with Supabase"
method: POST
path: "/storage/supabase/start"
tags: ["Storage"]
---

# Start Sign in with Supabase

`POST /storage/supabase/start`

Returns the Supabase authorization URL to send the person to. When they return, list the projects the sign-in can see with the state, then finish one as a connection. The grant is read twice and forgotten; the vault keeps the project's own S3 session credential.

## Response `200`

Where to send the person

- object
  - `data` object, required
    - `url` string, uri, required
    - `state` string, required

## Other responses

- `401` — Unauthorized
- `403` — Missing scope or role
- `503` — Sign in with Supabase is not set up on this deployment

## Changes

- **2026-09-13** `e2df91eff7a2` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/rendobar/apis/rendobar-api/changes/storage/supabase/start/post.md)

---

[API](https://skmtc.dev/rendobar/apis/rendobar-api.md) · [All operations](https://skmtc.dev/rendobar/apis/rendobar-api/llms.txt) · [OpenAPI document](https://skmtc.dev/rendobar/apis/rendobar-api/revisions/e2df91eff7a2?raw)