---
title: "Look up a mutation receipt by caller key"
method: GET
path: "/mutations/lookup"
tags: ["Platform"]
---

# Look up a mutation receipt by caller key

`GET /mutations/lookup`

## Request

- Base URL: `https://blitzreels.com/api/v1`
- URL: `https://blitzreels.com/api/v1/mutations/lookup`
- Auth: API key in header `Authorization`

Read the receipt for this API key, workspace, operation and idempotency key. No mutation is retried. A null receipt means no receipt was found at read time; it does not prove that an outstanding request cannot still be accepted. Receipt status describes request execution, not background job completion.

## Query parameters

- `operation` string, required
- `idempotency_key` string, required

## Response `200`

Successful response

- object
  - `receipt` object, nullable, required
    - `receipt_id` string, required
    - `operation` string, required
    - `idempotency_key` string, required
    - `status` 'in_progress' | 'applied' | 'completed' | 'failed', required
    - `created_at` string, required
    - `updated_at` string, required
    - `completed_at` string, nullable, required
    - `resources` object, required
      - `project_id` string, nullable, required
      - `job_id` string, nullable, required
      - `media_id` string, nullable, required
      - `export_id` string, nullable, required

## Other responses

- `400`: Invalid input data
- `401`: Authorization not provided
- `403`: Insufficient access
- `404`: Not found
- `500`: Internal server error

---

[API](https://skmtc.dev/blitzreels/apis/blitzreels-api.md) · [All operations](https://skmtc.dev/blitzreels/apis/blitzreels-api/llms.txt) · [OpenAPI document](https://skmtc.dev/blitzreels/apis/blitzreels-api/revisions/35608b12471d?raw)