curl --request POST \
--url https://api.poyo.ai/api/generate/submit \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"model": "flux-dev",
"callback_url": "https://your-domain.com/callback",
"input": {
"prompt": "A cinematic product photo of a matte black smart speaker on a marble table, soft studio lighting",
"size": "4:3",
"n": 1,
"output_format": "png"
}
}
'{
"code": 200,
"data": {
"task_id": "task-unified-1757165031-uyujaw3d",
"status": "not_started",
"created_time": "2026-06-26T10:30:00"
}
}{
"code": 400,
"error": {
"message": "Invalid request parameters",
"type": "invalid_request_error"
}
}{
"code": 400,
"error": {
"message": "Invalid request parameters",
"type": "invalid_request_error"
}
}Flux Dev
The FLUX.1 Dev API generates images from a prompt or edits exactly one reference image. Text-to-image accepts preset ratios, a high-definition square, or a custom WIDTHxHEIGHT size.
curl --request POST \
--url https://api.poyo.ai/api/generate/submit \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"model": "flux-dev",
"callback_url": "https://your-domain.com/callback",
"input": {
"prompt": "A cinematic product photo of a matte black smart speaker on a marble table, soft studio lighting",
"size": "4:3",
"n": 1,
"output_format": "png"
}
}
'{
"code": 200,
"data": {
"task_id": "task-unified-1757165031-uyujaw3d",
"status": "not_started",
"created_time": "2026-06-26T10:30:00"
}
}{
"code": 400,
"error": {
"message": "Invalid request parameters",
"type": "invalid_request_error"
}
}{
"code": 400,
"error": {
"message": "Invalid request parameters",
"type": "invalid_request_error"
}
}- After submission, a
task_idwill be returned. If you provided acallback_url, when the task status becomesfinishedorfailed, a POST request will be sent to thecallback_url. - Regardless of whether
callback_urlis provided, you can retrieve the result through the unified Query Task Status endpoint.
flux-dev from a prompt, or provide one input.image_urls item to edit an existing image.
Use input.size for text-to-image output size, input.n for the output image count, and input.output_format for the returned image format. Supported size values are 1:1, 1:1 HD, 4:3, 3:4, 16:9, and 9:16; 1:1 HD is the high-definition square option. Custom WIDTHxHEIGHT values such as 1024x1536 are also supported. For image-to-image tasks, the source image guides the output and input.size is ignored.
Models
- flux-dev - Text-to-image generation and single-image editing
Authorizations
All API endpoints require Bearer Token authentication.
Create an API key: sign in to PoYo, open Dashboard → API Key at poyo.ai/dashboard/api-key, and click to create a key.
Add it to the request header:
Authorization: Bearer YOUR_API_KEY
Body
Flux Dev model identifier
flux-dev Input parameters. Omit image_urls for text-to-image generation, or provide one image URL for image-to-image editing.
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Webhook callback URL for result notifications
"https://your-domain.com/callback"
Response
Task submitted successfully
Business status code. 200 means success; any other value means the request failed. Always check this field: some validation errors return HTTP 200 with code: 400 in the body.
200: Success400: Invalid request parameters401: Missing or invalid API key402: Insufficient credits403: Permission denied404: Resource not found408: Request timeout429: Rate limit exceeded500: Internal server error502: Upstream service error503: Service unavailable
See Error Codes for details.
200, 400, 401, 402, 403, 404, 408, 429, 500, 502, 503 200
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