Cartoon image API

What it is for

The cartoon model is a full Krea 2 finetune tuned for western comics and cartoons: bold clean outlines, flat or cel-shaded colour, readable expressions and poses, on a 12B model that follows sentence-length prompts closely.

Nothing is prepended to your prompt on this model. Image-to-image and inpainting run on a Pony SDXL companion checkpoint under the same model id, which does use its native score-tag prefix.

• Stylised character art and cartoon scenes
• Image to image for restyling an existing frame
• Inpainting to fix or replace a region
• Trained characters from the characters API, on the same family

Generate an image

curl https://api.fastgencloud.com/v1/images/generations \
  -H "Authorization: Bearer $FASTGEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
      "model": "krea-2-cartoon",
      "prompt": "a cheerful barista cartoon character behind an espresso machine, bold outlines, flat colour, expressive pose",
      "size": "1024x1024"
    }'

Parameters

model

krea-2-cartoon

prompt

plain-language prompt, 1–2000 characters, verbatim

negative_prompt

optional, verbatim — only has an effect when guidance is above 1

size

1024x1024, 832x1216, 1216x832, 896x1152, 1152x896

n

1–4 images per request

seed

optional integer for reproducible output

steps / guidance

defaults 8 / 1 (turbo-distilled); steps 4–24, guidance 1–8

Unfiltered and uncensored

This endpoint applies no content filter. Your prompt, negative prompt, reference images and LoRAs reach the model verbatim, nothing is rewritten or injected, and outputs are not scanned or blocked. What your product allows is your call.

The one automatic rule is the minor-safety floor: a prompt that pairs a minor or age reference with sexual content is refused for that request only. Nothing else is filtered and the account is never touched by moderation.

How the API works

Every generation is a job. The POST returns 202 with a job id immediately, so your request thread is never blocked on a GPU. You then either poll GET /v1/jobs/{id} or register a webhook_url and receive a signed callback when the job finishes.

Send an Idempotency-Key header and a retried request replays the original job instead of charging you twice. Your wallet is debited when the job is submitted and refunded automatically if it fails.

curl https://api.fastgencloud.com/v1/jobs/$JOB_ID \
  -H "Authorization: Bearer $FASTGEN_API_KEY"

Pricing and billing

Pricing is prepaid and usage-based: you top the wallet up with a card and each job debits it. There is no subscription, no per-seat cost, and no monthly minimum.

Images above 1 megapixel are billed pro rata by pixel count — a 1.5 MP image costs 1.5x the listed rate. Failed jobs are refunded in full, automatically.