---
title: "Upload Blob"
method: POST
path: "/blobs/upload"
tags: ["runtime_mutations", "blobs"]
---

# Upload Blob

`POST /blobs/upload`

Upload a file as a blob with streaming status updates.

Args:
    file: The file to upload

Returns:
    Server-Sent Events stream with upload progress and final UUID

## Response `200`

Successful Response

- unknown

## Other responses

- `422` — Validation Error

## Changes

- **2026-09-18** `abf76937a751` — 1 breaking, 3 info
  - the `file` request property contentMediaType changed from `` to `application/octet-stream`
  - the `file` request property format was generalized from `binary` to no format
  - added the optional property `detail/items/ctx` to the response with the `422` status
  - added the optional property `detail/items/input` to the response with the `422` status

[Change history](https://skmtc.dev/quadrillion/apis/quadrillion-cloud-api/changes/blobs/upload/post.md)

---

[API](https://skmtc.dev/quadrillion/apis/quadrillion-cloud-api.md) · [All operations](https://skmtc.dev/quadrillion/apis/quadrillion-cloud-api/llms.txt) · [OpenAPI document](https://skmtc.dev/quadrillion/apis/quadrillion-cloud-api/revisions/d7f2f3b8e82d?raw)