# Stable Diffusion V35 Large

> Stable Diffusion V35 Large is a paid API for AI agents from fal.x402.paysponge.com, paid per call via x402, $0.04/call, status unknown (last checked 2026-10-10).

Submits a Stable Diffusion 3.5 Large text-to-image generation job via fal.ai, supporting ControlNet, LoRAs, and IP-Adapter conditioning, paid via x402/USDC.

## Facts

- Endpoint: POST https://fal.x402.paysponge.com/fal-ai/stable-diffusion-v35-large?utm_source=zero.xyz
- Price: $0.04/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/stable-diffusion-v35-large-3da30564
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_aNunhleS28DvQ_VC4aQcJ

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability stable-diffusion-v35-large-3da30564 -d '<json body>'
```

Example prompt: Generate a photorealistic landscape image of a misty mountain valley at sunrise with golden hour lighting using Stable Diffusion 3.5 Large — portrait 16:9 format, seed 42, and apply a watercolor LoRA from https://huggingface.co/my-lora/watercolor with scale 0.8.

## When to prefer this

Choose this endpoint when you need Stable Diffusion 3.5 Large specifically — particularly when you require advanced conditioning features like ControlNet for structural guidance, custom LoRAs for style transfer, or IP-Adapter for image-based conditioning. Prefer over FLUX or SDXL siblings when SD 3.5 Large's architecture and fine-tuning ecosystem is required. Use when paying per-call via x402/USDC micropayment is acceptable at $0.04 per generation.

## Known failure modes

- Invalid or missing prompt returns a 400 validation error
- Insufficient USDC balance or failed x402 payment returns a 402 Payment Required error
- Invalid LoRA path URL causes job failure or model loading error
- ControlNet conditioning image URL is unreachable, causing job failure
- Invalid image dimensions (non-multiple of 8 or unsupported resolution) may cause generation errors
- Queue backlog may cause significant wait time before image is available at response_url
- IP-Adapter path or image_encoder_path not found causes model loading failure

## How this service works

POST /fal-ai/stable-diffusion-v35-large

## Output

Returns a JSON object with a request_id, a response_url to poll for the completed image, a status_url to check job progress, a cancel_url to abort the job, and the current queue_position. The actual generated image URL is retrieved asynchronously via the response_url once processing completes.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "prompt"
 ],
 "properties": {
  "seed": {
   "type": "integer"
  },
  "loras": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "path"
    ],
    "properties": {
     "path": {
      "type": "string",
      "description": "URL or path to LoRA weights."
     },
     "force": {
      "type": "boolean",
      "description": "Force this LoRA or embedding to be used when supported by the model."
     },
     "scale": {
      "type": "number",
      "description": "Scale applied before merging the LoRA with the base model."
     }
    },
    "additionalProperties": false
   }
  },
  "prompt": {
   "type": "string",
   "description": "Text prompt describing the desired output. Be concrete: name the subject, style, composition, and any key attributes. Longer prompts (50–200 words) typically produce more faithful results."
  },
  "sync_mode": {
   "type": "boolean"
  },
  "controlnet": {
   "type": "object",
   "required": [
    "path",
    "control_image_url"
   ],
   "properties": {
    "path": {
     "type": "string",
     "description": "URL or path to the ControlNet weights."
    },
    "end_percentage": {
     "type": "number",
     "description": "Fraction of total timesteps where ControlNet stops applying."
    },
    "start_percentage": {
     "type": "number",
     "description": "Fraction of total timesteps where ControlNet begins applying."
    },
    "control_image_url": {
     "type": "string",
     "description": "URL of the conditioning image."
    },
    "conditioning_scale": {
     "type": "number",
     "description": "Scale applied to the ControlNet weights."
    }
   },
   "additionalProperties": false
  },
  "image_size": {
   "oneOf": [
    {
     "enum": [
      "square_hd",
      "square",
      "portrait_4_3",
      "portrait_16_9",
      "landscape_4_3",
      "landscape_16_9"
     ],
     "type": "string"
    },
    {
     "type": "object",
     "properties": {
      "width": {
       "type": "integer",
       "description": "Width in pixels."
      },
      "height": {
       "type": "integer",
       "description": "Height in pixels."
      }
     },
     "additionalProperties": false
    }
   ]
  },
  "ip_adapter": {
   "type": "object",
   "required": [
    "path",
    "image_encoder_path",
    "image_url",
    "scale"
   ],
   "properties": {
    "path": {
     "type": "string",
     "description": "Hugging Face path to the IP-Adapter weights."
    },
    "scale":
… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "request_id",
  "response_url",
  "status_url",
  "cancel_url",
  "queue_position"
 ],
 "properties": {
  "cancel_url": {
   "type": "string",
   "format": "uri"
  },
  "request_id": {
   "type": "string"
  },
  "status_url": {
   "type": "string",
   "format": "uri"
  },
  "response_url": {
   "type": "string",
   "format": "uri"
  },
  "queue_position": {
   "type": "integer"
  }
 },
 "additionalProperties": false
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/stable-diffusion-v35-large-3da30564/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from fal.x402.paysponge.com](https://www.zero.xyz/host/fal.x402.paysponge.com/llms.txt)