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Fast SDXL Text-to-Image via PaySponge x402
x402
Fast SDXL Text-to-Image via PaySponge x402 is a paid API for AI agents from fal.x402.paysponge.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-12).
Submits a Fast SDXL text-to-image generation job to fal.ai through the PaySponge x402 payment wrapper, returning a request ID and polling URLs.
Price / call$0.01
Success—
StatusUnknown
How this service works
POST /fal-ai/fast-sdxl
Output
Returns a JSON object containing a request_id string, a response_url to fetch the final generated image(s), a status_url to poll job progress, a cancel_url to abort the job, and an integer queue_position indicating where the job sits in the fal.ai processing queue.
Example use cases
Example prompt
“Generate an image of a misty mountain range at sunrise with golden light using Fast SDXL — landscape 16:9 format, 30 inference steps, guidance scale 7.5, no people, and give me 1 image as a PNG.”
Technical details
Endpoint
POSThttps://fal.x402.paysponge.com/fal-ai/fast-sdxl?utm_source=zero.xyzWhen to prefer
Prefer this endpoint when you need fast, asynchronous SDXL image generation with support for LoRA customization and custom embeddings, paid per-call via x402 USDC micropayments. Choose Fast SDXL over FLUX variants when you want the classic SDXL architecture, LoRA/embedding support, or when cost per image matters at $0.01 USDC. Use when you need an async queue-based workflow with polling rather than synchronous response.
Side effects
- Missing required 'prompt' field returns a validation error
- Invalid image_size enum value causes a 400 bad request
- Payment failure via x402 protocol returns a 402 Payment Required response
- Invalid LoRA path URL causes job failure detectable via status_url
- Exceeding fal.ai rate limits returns a 429 Too Many Requests
- Job timeout or fal.ai backend error detected when polling status_url returns error state
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| seed | integer | |
| loras | array | |
| format | string | |
| promptrequired | string | Prompt used for generation. |
| sync_mode | boolean | |
| embeddings | array | |
| image_size | — | |
| num_images | integer | |
| request_id | string | Optional caller-supplied identifier echoed by fal. |
| expand_prompt | boolean | |
| guidance_scale | number | CFG scale. Default 7.5. |
| negative_prompt | string | |
| num_inference_steps | integer | |
| enable_safety_checker | boolean | |
| safety_checker_version | string |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| cancel_urlrequired | string | |
| request_idrequired | string | |
| status_urlrequired | string | |
| response_urlrequired | string | |
| queue_positionrequired | integer |
Tags
x402
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