POST/api/v1/imagine1 creditAsynchronous

Flux Schnell

Provider · Black Forest LabsType · T2IModel ID · flux-schnellUpstream ID · flux-schnell (BFL direct)

Flux.1 Schnell by Black Forest Labs. The fastest Flux.1 model at 1 credit. Designed for speed over quality — useful for quick previews or high-volume pipelines where latency matters. Asynchronous despite being fast.

Request Parameters

Parameter	Type	Required	Description
prompt	`string`	Required	The text prompt describing the image to generate.
model	`string`	Optional	Set to `flux-schnell` to use this model.Default: `flux-schnell`
aspect_ratio	`string`	Optional	Output aspect ratio. Allowed: 1:1 · 16:9 · 9:16 · 4:3 · 3:4 · 3:2 · 2:3.Default: `1:1`
negative_prompt	`string`	Optional	What to avoid in the generation. Max 4000 characters.
webhook_url	`string`	Optional	URL where we POST the completed task result.
webhook_secret	`string`	Optional	Sent as x-webhook-secret header in webhook delivery for verification.

Example Request

cURL

curl -X POST https://api.journeyapi.com/api/v1/imagine \
  -H "Authorization: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "flux-schnell",
    "prompt": "quick sketch of a tabby cat",
    "aspect_ratio": "1:1"
  }'

Immediate Response

Returns immediately with a task ID. Poll /fetch or set a webhook_url to receive the result.

200 OK

{
  "task_id": "550e8400-e29b-41d4-a716-446655440000"
}

Tips

1Same 1 credit as Flux.2 Dev but uses BFL direct polling (async). Use Flux.2 Dev instead if you prefer synchronous responses.

Quirks & Gotchas

Asynchronous: requires polling /fetch or a webhook, even though generation is fast.