01 — Why img-forge

Infrastructure you’d build anyway

Prompt enhancement, model routing, async job queues, R2 storage, idempotency. We built the unsexy layer so you can ship the product.

Multi-tenant from day one

Isolated tenants, per-key scoping, quota enforcement, and audit logs. Every generation is traceable to a tenant and API key — ready for your billing layer.

D1 + Durable Objects

MCP server for AI agents

Connect Claude, Cursor, or any MCP client and generate images through tool calls. No SDK, no integration code — your agent just calls generate_image and gets a URL back.

Model Context Protocol

One API, five models

SDXL Lightning, FLUX Klein 4B, FLUX.2 Dev, Gemini 2.5 Flash, Gemini 3.1 Flash. Pick a quality tier — the router selects the model. Same interface via REST or MCP.

Workers AI + Gemini

Used by Stackbilder for UI concept art and visual prototyping. Part of the Stackbilt ecosystem.

02 — How it works

Two interfaces, one pipeline

Use the REST API from your backend, or connect the MCP server to any AI agent. Both hit the same pipeline — prompt analysis, quality boosters, model routing, content-addressed storage.

Claude / Cursor / MCP Client

// Your AI agent calls the tool directly
generate_image({
  prompt: "a robot",
  quality_tier: "premium"
})

Tool Result

Generated image (premium tier via FLUX.2 Dev)

Prompt:     "a robot"
Enhanced:  "a robot, masterpiece,
           best quality, highly detailed,
           sharp focus, 8k, photorealistic"
Asset URL: /v2/assets/cd2158...
Job ID:    f47ac10b-58cc...

03 — Output

Generated via the API

Every image below was produced through img-forge — same endpoint, different tiers. From UI mockups to photorealistic scenes.

Ultra

“a clean modern SaaS dashboard UI with analytics charts, dark theme, sidebar navigation”

Premium

“cyberpunk city street at night”

Ultra

“an astronaut floating above earth at sunrise, cinematic lighting”

Ultra+

“a mobile app onboarding screen UI design, minimal white background”

Browse full gallery & prompt guide

03.5 — Connect

Add to Claude Desktop in 30 seconds

Paste this into your claude_desktop_config.json and restart Claude. Your agent can generate images immediately.

{
  "mcpServers": {
    "img-forge": {
      "url": "https://mcp.stackbilt.dev/sse",
      "headers": {
        "Authorization": "Bearer YOUR_API_KEY"
      }
    }
  }
}

Tools exposed: image_generate · visual_analyze · image_check_job · image_list_models

04 — Pricing

Buy credits, generate images

img-forge is part of the Stackbilt platform. One account, one credit pool — shared across img-forge and Stackbilder.

STARTER

100 credits · $0.03/credit

Try it out. Enough for 100 drafts, 50 standard, 20 premium, or 5 ultra+ images.

BUY CREDITS

BUILDER BEST VALUE

$12.50

500 credits · $0.025/credit

The sweet spot. 500 drafts, 250 standard, 100 premium, or 25 ultra+ generations.

BUY CREDITS

STUDIO

$20

1,000 credits · $0.02/credit

Production volume. Best per-credit rate for teams and heavy workflows.

BUY CREDITS

1 creditDraft image 2 creditsStandard image 5 creditsPremium image 10 creditsUltra image 20 creditsUltra+ image

Ultra+ — Maximum quality, 4K resolution, extended generation time. Best for hero images, portfolio pieces, and print-ready assets.

Or get credits monthly with a Stackbilt subscription — includes Stackbilder architecture tools and priority support.

05 — Get Started

Start generating in 60 seconds

Get Your API Key View on GitHub

Open to all developers. 25 free credits on signup.