keirouter-image

name	keirouter-image
description	Generate images via KeiRouter /v1/images/generations using OpenAI DALL-E / Gemini Imagen / FLUX / MiniMax / Stability AI / Fal.ai models. Use when the user wants to create, generate, draw, or render an image, picture, or text-to-image (txt2img).

KeiRouter — Image Generation

Requires KEIROUTER_URL (and KEIROUTER_KEY if auth enabled). See https://raw.githubusercontent.com/mydisha/keirouter/main/skills/keirouter/SKILL.md for setup.

Discover

curl $KEIROUTER_URL/v1/models/image | jq '.data[].id'
# Per-model params/options (size enum, quality enum)
curl "$KEIROUTER_URL/v1/models/info?id=openai/dall-e-3"

Endpoint

POST $KEIROUTER_URL/v1/images/generations

Field	Required	Notes
model	yes	from /v1/models/image
prompt	yes	image description
n	no	count (provider-dependent)
size	no	1024x1024, 1792x1024, ...
quality	no	standard / hd (OpenAI)
response_format	no	url (default) or b64_json

Add query ?response_format=binary to receive raw image bytes (handy for saving file).

Examples

Save to file (binary):

curl -X POST "$KEIROUTER_URL/v1/images/generations?response_format=binary" \
  -H "Authorization: Bearer $KEIROUTER_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"gemini/gemini-3-pro-image-preview","prompt":"watercolor mountains at sunrise","size":"1024x1024"}' \
  --output out.png

JS (URL response):

const r = await fetch(`${process.env.KEIROUTER_URL}/v1/images/generations`, {
  method: "POST",
  headers: { "Authorization": `Bearer ${process.env.KEIROUTER_KEY}`, "Content-Type": "application/json" },
  body: JSON.stringify({ model: "gemini/gemini-3-pro-image-preview", prompt: "neon city", size: "1024x1024" }),
});
const { data } = await r.json();
console.log(data[0].url || data[0].b64_json.slice(0, 40));

Response shape

JSON (default response_format=url):

{ "created": 1735000000, "data": [{ "url": "https://..." }] }

response_format=b64_json:

{ "created": 1735000000, "data": [{ "b64_json": "iVBORw0KGgo..." }] }

Query ?response_format=binary returns raw image bytes (Content-Type image/png or image/jpeg).

Provider quick reference

Provider	ID	Notes
OpenAI	openai	DALL-E 3, standard/hd quality
Gemini	gemini	Imagen, only prompt required
MiniMax	minimax	Standard OpenAI shape
Stability AI	stability-ai	style preset, output_format
Fal.ai	fal-ai	Async polling, img2img via image
NanoBanana	nanobanana	Edit mode via image/images[]
OpenRouter	openrouter	Routes to underlying image models