---
title: "Execute Workflow Async (External)"
method: POST
path: "/workflow/execute/external/{workflowId}/async"
tags: ["external", "Workflows"]
---

# Execute Workflow Async (External)

`POST /workflow/execute/external/{workflowId}/async`

Triggers an asynchronous workflow execution using external API key authentication. Returns immediately with an execution ID that can be used to poll for status and retrieve results. Use GET /workflow/external/{id}/executions/{executionId} to check status.

## Path parameters

- `workflowId` string, required

## Query parameters

- `api_key` string
- `configuration_id` string
- `start_from_step` integer
- `end_at_step` integer
- `callback_url` string

## Headers

- `X-API-KEY` string

## Response `202`

Workflow execution started

## Other responses

- `400` — Invalid parameters
- `401` — Unauthorized

---

[API](https://skmtc.net/laminar/apis/laminar-api.md) · [All operations](https://skmtc.net/laminar/apis/laminar-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/laminar/laminar-api/versions/f0b9f895fdd8/schema)