MOSS Image API documentation

Name: MOSS Image API
Brand: OpenMOSS
SKU: openmoss/moss-image
Availability: InStock

Everything you need to call MOSS Image from your code. Base URL https://cheapergen.com/api/v1. Try it first in the playground.

Using a coding agent?

Paste this into Claude Code, Cursor, Codex or any coding agent. It adds the API to your project, keeps the key in CHEAPERGEN_API_KEY and tests with a free quote before anything is spent.

Add MOSS Image (CheaperGen endpoint openmoss/moss-image/text-to-image) to this project by following https://cheapergen.com/agents/integrate.md

What your agent reads

Authentication

Create a key in Dashboard → API keys and send it as a bearer token. Keep keys server-side.

export CHEAPERGEN_API_KEY="cg_live_…"

# every request
Authorization: Bearer $CHEAPERGEN_API_KEY

MOSS Image Text to Image API

POST/api/v1/run/openmoss/moss-image/text-to-image

Submits an asynchronous job and returns 202 with a generation id. Poll GET /api/v1/generations/{id} or pass webhook_url. See job lifecycle.

Input parameters

Name	Type	Description	Affects price
`prompt`required	string	Natural language, comma-separated tags or a JSON layout (a scene caption plus items with text and bounding boxes, in pixels from the canvas centre). Put the exact words to render in quotes.	No
`aspect_ratio`	string (enum)	Output image shape. At 1K: 1:1 = 1024 × 1024, 4:5 = 912 × 1136, 5:4 = 1136 × 912, 3:4 = 880 × 1168, 4:3 = 1168 × 880, 2:3 = 832 × 1248, 3:2 = 1248 × 832, 9:16 = 768 × 1360, 16:9 = 1360 × 768, 1:2 = 720 × 1440, 2:1 = 1440 × 720, 9:21 = 656 × 1552, 21:9 = 1552 × 656, 1:3 = 576 × 1760, 3:1 = 1760 × 576. Values: 1:1 · 4:5 · 5:4 · 3:4 · 4:3 · 2:3 · 3:2 · 9:16 · 16:9 · 1:2 · 2:1 · 9:21 · 21:9 · 1:3 · 3:1 Default: 1:1	Yes
`resolution`	string (enum)	Output size, the same price at every aspect ratio: 1K = 1 MP (1024 × 1024), 1.5K ≈ 2.25 MP (1536 × 1536), 2K = 4 MP (2048 × 2048) at 1:1, with 1 MP = 1024² px. Other ratios keep the pixels: each side is the 1:1 side × √ratio, rounded down to a multiple of 16 (e.g. 2K 16:9 = 2720 × 1536). Values: 1K · 1.5K · 2K Default: 1K	Yes
`seed`	integer	Use the same seed and settings to reproduce a result. Leave empty for random.	No
`enable_safety_checker`	boolean	If set to true, the safety checker will be enabled. Content our Acceptable Use Policy prohibits stays blocked either way. Default: true	No
`webhook_url`	string (URL)	Optional. We POST the finished generation here, signed with your webhook secret. Webhooks	No

Request

const API = "https://cheapergen.com/api/v1";
const headers = {
  Authorization: `Bearer ${process.env.CHEAPERGEN_API_KEY}`,
  "Content-Type": "application/json",
};

// 1. Submit the job
let job = await fetch(`${API}/run/openmoss/moss-image/text-to-image`, {
  method: "POST",
  headers,
  body: JSON.stringify({
    "prompt": "A hand-painted wooden sign outside a tea shop that reads “山间茶舍 MOUNTAIN TEA HOUSE — OPEN DAILY 9–6”, morning mist, warm light",
    "aspect_ratio": "1:1",
    "resolution": "1K"
  }),
}).then((r) => r.json());

// 2. Poll until it finishes (or pass webhook_url and skip polling)
while (job.status === "queued" || job.status === "running") {
  await new Promise((r) => setTimeout(r, 3000));
  job = await fetch(`${API}/generations/${job.id}`, { headers }).then((r) => r.json());
}

console.log(job.status === "succeeded" ? job.output.images[0].url : job.error);

import os, time, requests

API = "https://cheapergen.com/api/v1"
headers = {"Authorization": f"Bearer {os.environ['CHEAPERGEN_API_KEY']}"}

# 1. Submit the job
job = requests.post(f"{API}/run/openmoss/moss-image/text-to-image", headers=headers, json={
    "prompt": "A hand-painted wooden sign outside a tea shop that reads “山间茶舍 MOUNTAIN TEA HOUSE — OPEN DAILY 9–6”, morning mist, warm light",
    "aspect_ratio": "1:1",
    "resolution": "1K"
}).json()

# 2. Poll until it finishes (or pass "webhook_url" and skip polling)
while job["status"] in ("queued", "running"):
    time.sleep(3)
    job = requests.get(f"{API}/generations/{job['id']}", headers=headers).json()

print(job["status"], job["output"]["images"][0]["url"] if job["status"] == "succeeded" else job["error"])

curl -X POST https://cheapergen.com/api/v1/run/openmoss/moss-image/text-to-image \
  -H "Authorization: Bearer $CHEAPERGEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "prompt": "A hand-painted wooden sign outside a tea shop that reads “山间茶舍 MOUNTAIN TEA HOUSE — OPEN DAILY 9–6”, morning mist, warm light",
  "aspect_ratio": "1:1",
  "resolution": "1K"
}'

Response

{
  "id": "gen_8c2QmX1nq0k4",
  "object": "generation",
  "model": "openmoss/moss-image",
  "endpoint": "openmoss/moss-image/text-to-image",
  "mode": "text-to-image",
  "status": "queued",
  "input": {
    "prompt": "A hand-painted wooden sign outside a tea shop that reads “山间茶舍 MOUNTAIN TEA HOUSE — OPEN DAILY 9–6”, morning mist, warm light",
    "aspect_ratio": "1:1",
    "resolution": "1K"
  },
  "output": null,
  "error": null,
  "cost": {
    "amount_usd": 0.2255,
    "currency": "usd",
    "estimated": true,
    "official_usd": null,
    "list_price_source": "reference",
    "list_price_label": "fal API",
    "saved_usd": null
  },
  "source": "api",
  "started_at": null,
  "completed_at": null,
  "urls": {
    "get": "https://cheapergen.com/api/v1/generations/gen_8c2QmX1nq0k4",
    "cancel": "https://cheapergen.com/api/v1/generations/gen_8c2QmX1nq0k4/cancel"
  },
  "created_at": "2026-10-15T09:21:04Z"
}

{
  "id": "gen_8c2QmX1nq0k4",
  "object": "generation",
  "model": "openmoss/moss-image",
  "endpoint": "openmoss/moss-image/text-to-image",
  "mode": "text-to-image",
  "status": "succeeded",
  "input": {
    "prompt": "A hand-painted wooden sign outside a tea shop that reads “山间茶舍 MOUNTAIN TEA HOUSE — OPEN DAILY 9–6”, morning mist, warm light",
    "aspect_ratio": "1:1",
    "resolution": "1K"
  },
  "output": {
    "images": [
      {
        "url": "https://cdn.cheapergen.com/outputs/gen_8c2Q-0.png",
        "content_type": "image/png",
        "width": 2048,
        "height": 2048
      }
    ]
  },
  "error": null,
  "cost": {
    "amount_usd": 0.2255,
    "currency": "usd",
    "estimated": false,
    "official_usd": 0.264,
    "list_price_source": "reference",
    "list_price_label": "fal API",
    "saved_usd": 0.0385
  },
  "source": "api",
  "created_at": "2026-10-15T09:21:04Z",
  "started_at": "2026-10-15T09:21:06Z",
  "completed_at": "2026-10-15T09:22:31Z"
}

Get the result

Generations are asynchronous. Poll until status is succeeded, failed or canceled — or pass webhook_url when you submit. Failed generations are refunded automatically.

curl https://cheapergen.com/api/v1/generations/gen_8c2QmX1nq0k4 \
  -H "Authorization: Bearer $CHEAPERGEN_API_KEY"

More: job lifecycle · webhooks · errors

MOSS Image pricing

Pay per image as you go, with no subscription required. Failed generations are refunded automatically.

Tier	fal API	CheaperGen	You save
1K 1024 × 1024	~~$0.05~~/img	$0.0384/img With a monthly plan: Pro $0.0368Max $0.0352	−23%
1.5K 1536 × 1536	~~$0.1125~~/img	$0.0826/img With a monthly plan: Pro $0.0788Max $0.0749	−27%
2K 2048 × 2048	~~$0.20~~/img	$0.1534/img With a monthly plan: Pro $0.1469Max $0.1404	−23%

Monthly plans lower prices on most models (shown under each price); you can still pay as you go. Pro $499/month · Max $4,999/month.

fal API: fal's public price for MOSS Image, $0.05 per megapixel, on the output's pixels (OpenMOSS sells no international API) — https://fal.ai/models/fal-ai/moss-image. Prices verified October 22, 2026.
One price per resolution, whatever the aspect ratio.