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fastapi.online — Concept Art Generator
x402
fastapi.online — Concept Art Generator is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.012/call, status down (last checked 2026-09-15).
Generates concept art images from a text description using self-hosted AI image generation models, with optional seed for reproducibility.
Price / call$0.012
Success—
StatusDown
How this service works
Chat, embeddings, OCR, speech-to-text, image editing, image understanding (captioning/Q&A), text-to-speech, translation, writing tools, classification tools, developer tools, local utilities, format/checksum validators, encoding & crypto utilities, date/time calculators, geo/coordinate math, math & finance calculators, novelty tools, and business/social writing generators — 179 endpoints in all, across multiple specialized self-hosted models. Pay per call with crypto — no signup — or get an API key.
Output
Returns a generated concept art image based on the provided text description. The seed parameter allows reproducible outputs — using the same seed and description will yield the same image. The image is delivered as a response payload (likely base64-encoded or a URL), suitable for creative, game, or design workflows.
Example use cases
Game asset concept art creation
“Create concept art of a futuristic cyberpunk city street at night with neon reflections on wet pavement — use seed 7 so I can recreate it later.”
Character design visualization
“Generate concept art of an armored elf warrior wielding a glowing spear, standing in an enchanted forest, use seed 100.”
Sci-fi environment concept for pitch deck
“Make concept art of a massive space station interior with towering glass domes and floating cargo drones, seed 512.”
Technical details
Endpoint
POSThttps://api.fastapi.online/generate-concept-artWhen to prefer
Choose this endpoint when you need quick, pay-per-call AI concept art generation without signing up for a full account. It's ideal for agents or developers who want reproducible image outputs via a seed parameter and prefer crypto micro-payments (USDC) over subscription billing. Prefer this over larger cloud image APIs when cost-per-call economics matter and no API key setup is desired.
Side effects
- Description too short (minLength:1) or too long (maxLength:300) returns validation error
- Invalid seed type (non-integer) causes schema validation failure
- Payment failure or insufficient USDC balance results in 402 Payment Required
- Model overload or server timeout may return 503 or timeout error
- Empty or nonsensical description may produce low-quality or abstract outputs
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| seed | integer | |
| description | string | the concept |
Tags
x402
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