Stable Diffusion 3 Medium Image to Image Serverless API

Stable Diffusion 3 Medium image-to-image is a cutting-edge AI tool that uses advanced image-to-image technology to transform one image into another.

POST /v2/sd3-med-img2img · submit + poll
 1# pip install "segmind>=1.1.0"
 2# export SEGMIND_API_KEY="YOUR_API_KEY"
 3import segmind
 4
 5# Async (v2): submit to the queue and block until COMPLETED.
 6# run() returns the final result dict (600s deadline, 1.0s poll by default).
 7result = segmind.run(
 8    "sd3-med-img2img",
 9    prompt="photo of a boy holding phone on table,3d pixar style",
10    negative_prompt="low quality,less details",
11    image="https://segmind-sd-models.s3.amazonaws.com/display_images/sd3-img2img-ip.jpg",
12    num_inference_steps=20,
13    guidance_scale=5,
14    seed=698845,
15    samples=1,
16    strength=0.7,
17    sampler="dpmpp_2m",
18    scheduler="sgm_uniform",
19    base64=False,
20)
21print(result["status"])                      # COMPLETED
22print(result.get("output"))                  # model output (e.g. media URL)
23print(result["metrics"]["inference_time"])   # server compute seconds
24
25# --- Or submit + poll manually (track request_id, control the cadence) ---
26from segmind import SegmindClient, InferenceFailed, InferenceTimeout
27
28client = SegmindClient()                      # reads SEGMIND_API_KEY
29payload = {
30    "prompt": "photo of a boy holding phone on table,3d pixar style",
31    "negative_prompt": "low quality,less details",
32    "image": "https://segmind-sd-models.s3.amazonaws.com/display_images/sd3-img2img-ip.jpg",
33    "num_inference_steps": 20,
34    "guidance_scale": 5,
35    "seed": 698845,
36    "samples": 1,
37    "strength": 0.7,
38    "sampler": "dpmpp_2m",
39    "scheduler": "sgm_uniform",
40    "base64": False,
41}
42job = client.submit_async("sd3-med-img2img", **payload)
43print(job.request_id)                         # available immediately
44try:
45    result = job.wait(timeout=600, interval=1.0)
46except InferenceTimeout as e:
47    print("still running:", e.request_id)
48except InferenceFailed as e:
49    print("failed:", e.detail)

API Endpoint

POSThttps://api.segmind.com/v1/sd3-med-img2img

Parameters

imagerequired
string (uri)

Input image

Default: "https://segmind-sd-models.s3.amazonaws.com/display_images/sd3-img2img-ip.jpg"
promptrequired
string

Text prompt for image generation

Default: "photo of a boy holding phone on table,3d pixar style"
base64optional
boolean

Base64 encoding of the output image

Default: false
guidance_scaleoptional
number

Guidance scale for image generation

Default: 5Range: 1 - 20
negative_promptoptional
string

Negative text prompt to avoid certain qualities

Default: "low quality,less details"
num_inference_stepsoptional
integer

Number of inference steps for image generation

Default: 20Range: 1 - 100
sampleroptional
string

Sampler for the image generation process

Default: "dpmpp_2m"
Allowed values (27 total):
"euler""euler_pp""euler_ancestral""euler_ancestral_pp""heun""heunpp2""dpm_2""dpm_2_ancestral""lms""dpm_fast"+17 more
samplesoptional
integer

Number of samples to generate

Default: 1
scheduleroptional
string

Scheduler for the image generation process

Default: "sgm_uniform"
Allowed values :
"normal""karras""exponential""sgm_uniform""simple""ddim_uniform"
seedoptional
integer

Seed for random number generation

Default: 698845
strengthoptional
number

Strength of the image transformation

Default: 0.7Range: 0 - 1

Response Type

Returns: Image

Asynchronous requests (v2)

Use Async for video, long-running (>~60s), or high-concurrency workloads; Sync is simplest for fast image & LLM calls. Async submits a request and you poll it to completion.

  1. 1
    POST /v2/sd3-med-img2img

    Submitreturns request_id, status_url, response_url

  2. 2
    GET /v2/requests/{id}/status

    Polluntil COMPLETED or FAILED

  3. 3
    GET /v2/requests/{id}

    Resultfinal response body

Status states

QUEUEDAccepted, waiting for a worker
PROCESSINGRunning on a worker
COMPLETEDDone — result body is ready
FAILEDErrored (incl. content/RAI blocks)
  • A FAILED request is served as HTTP 422 — the body still carries the error detail.
  • An unknown or expired request_id returns HTTP 404.
  • Results are retained for 1 hour, then expire.
  • Content / RAI blocks surface as FAILED, not a separate state.
  • Track completion by polling the status endpoint.

Common Error Codes

The API returns standard HTTP status codes. Detailed error messages are provided in the response body.

400

Bad Request

Invalid parameters or request format

401

Unauthorized

Missing or invalid API key

403

Forbidden

Insufficient permissions

404

Not Found

Model or endpoint not found

406

Insufficient Credits

Not enough credits to process request

429

Rate Limited

Too many requests

500

Server Error

Internal server error

502

Bad Gateway

Service temporarily unavailable

504

Timeout

Request timed out