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Image Generation API

Generate images using DALL-E, GPT Image (including ChatGPT Images 2.0), Google Nano Banana, CogView-4, or xAI Grok Imagine.

Endpoint

POST https://blockrun.ai/api/v1/images/generations

Request

{
  "model": "google/nano-banana",
  "prompt": "A futuristic city at sunset",
  "size": "1024x1024",
  "n": 1
}

Parameters

Parameter Type Required Description
model string Yes Model to use (see below)
prompt string Yes Image description
size string No Image dimensions (default: "1024x1024")
quality string No "standard" or "hd" (DALL-E 3 only)
n integer No Number of images (default: 1)

Available Models

Model ID Provider Sizes Price
openai/dall-e-3 OpenAI 1024x1024, 1024x1792, 1792x1024 $0.042
openai/gpt-image-1 OpenAI 1024x1024, 1536x1024, 1024x1536 $0.021
openai/gpt-image-2 OpenAI 1024x1024, 1536x1024, 1024x1536 $0.063
google/nano-banana Google 1024x1024 $0.053
google/nano-banana-pro Google 1024x1024, 2048x2048, 4096x4096 $0.105
zai/cogview-4 Zhipu AI 512x512 – 1440x1440 $0.015
xai/grok-imagine-image xAI 1024x1024 $0.021
xai/grok-imagine-image-pro xAI 1024x1024 $0.074

CogView-4 Sizes

zai/cogview-4 supports flexible sizes (multiples of 16, max 1440×1440):

Size Use Case
512x512 Thumbnails, icons
768x768 Social media
1024x1024 Standard (default)
768x1344 Portrait / mobile
1344x768 Landscape / banner
1440x1440 High resolution

Response

{
  "created": 1706000000,
  "data": [
    {
      "url": "https://blockrun.ai/api/media/media/images/2026/04/17/<id>.jpg",
      "source_url": "https://imgen.x.ai/xai-imgen/...",
      "backed_up": true,
      "revised_prompt": "..."
    }
  ]
}

Response Fields

Field Type Description
created integer Unix timestamp
data array Array of generated images
data[].url string Permanent URL. When GCS backup succeeds, this is a blockrun-hosted proxy URL; otherwise the upstream URL. For openai/gpt-image-1 and openai/gpt-image-2 this is a base64 data URI
data[].source_url string Original upstream URL (omitted for data URIs)
data[].backed_up boolean true when the image was mirrored to BlockRun's GCS bucket (omitted for data URIs)
data[].revised_prompt string Expanded prompt (DALL-E 3 only)

Why both url and source_url? Most providers return temporary URLs (OpenAI DALL-E URLs expire in 60 min, xAI Grok Imagine URLs are flagged xai-tmp-*). BlockRun mirrors each generated image to Google Cloud Storage and returns the permanent proxy URL as url.

Examples

Via ClawRouter (recommended for local use)

ClawRouter handles x402 payments automatically. Start it with openclaw gateway start, then call localhost:8402 directly.

curl -X POST http://localhost:8402/v1/images/generations \
  -H "Content-Type: application/json" \
  -d '{"model":"zai/cogview-4","prompt":"a futuristic city at night","size":"1024x1024"}'

Open the returned URL directly:

URL=$(curl -s -X POST http://localhost:8402/v1/images/generations \
  -H "Content-Type: application/json" \
  -d '{"model":"google/nano-banana","prompt":"your prompt here","size":"1024x1024"}' \
  | python3 -c "import sys,json; print(json.load(sys.stdin)['data'][0]['url'])")

open "$URL"   # macOS
xdg-open "$URL"   # Linux

Direct API (cURL)

curl -X POST https://blockrun.ai/api/v1/images/generations \
  -H "Content-Type: application/json" \
  -H "X-Payment: $PAYMENT_HEADER" \
  -d '{
    "model": "zai/cogview-4",
    "prompt": "a minimalist logo for an AI company",
    "size": "1024x1024"
  }'

Python

from blockrun_llm import ImageClient

client = ImageClient()

# CogView-4 (cheapest, supports Chinese prompts)
result = client.generate(
    "一个未来城市的夜景",
    model="zai/cogview-4",
    size="1344x768"
)
print(result.data[0].url)

# DALL-E 3
result = client.generate(
    "A futuristic AI robot",
    model="openai/dall-e-3",
    size="1024x1024"
)
print(result.data[0].url)

TypeScript

import { ImageClient } from '@blockrun/llm';

const client = new ImageClient();

// CogView-4
const result = await client.generate('a futuristic city at night', {
  model: 'zai/cogview-4',
  size: '1344x768',
});
console.log(result.data[0].url);

// DALL-E 3
const result2 = await client.generate('A futuristic AI robot', {
  model: 'openai/dall-e-3',
  size: '1024x1024',
});
console.log(result2.data[0].url);

Pricing

Model Size Price
CogView-4 up to 1440x1440 $0.015
CogView-4 1440x1440 $0.02
DALL-E 3 Standard 1024x1024 $0.042
DALL-E 3 Wide 1792x1024 $0.084
GPT Image 1 1024x1024 $0.021
ChatGPT Images 2.0 1024x1024 $0.063
ChatGPT Images 2.0 1536x1024 / 1024x1536 $0.126
Grok Imagine 1024x1024 $0.021
Grok Imagine Pro 1024x1024 $0.074
Nano Banana 1024x1024 $0.053
Nano Banana Pro 1024x1024 $0.105
Nano Banana Pro 4K 4096x4096 $0.158

Error Codes

Code Description
400 Invalid request (bad prompt or parameters)
402 Payment required (insufficient balance)
403 Content policy violation
429 Rate limit exceeded
500 Server error

Model Selection Guide

Use Case Recommended
Cheapest zai/cogview-4
Chinese prompts zai/cogview-4
Highest quality google/nano-banana-pro
Fast & reliable google/nano-banana
Best prompt following openai/dall-e-3
Image editing (img2img) openai/gpt-image-1 or openai/gpt-image-2
Multilingual text in images / character consistency openai/gpt-image-2
xAI-style stylization xai/grok-imagine-image-pro

OpenAI Compatibility

This endpoint is compatible with OpenAI's Images API:

from openai import OpenAI

client = OpenAI(
    base_url="https://blockrun.ai/api/v1",
    api_key="unused"  # x402 payment handled via header
)

response = client.images.generate(
    model="zai/cogview-4",
    prompt="A futuristic city",
    size="1024x1024"
)
print(response.data[0].url)

Links