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fastapi.online — API Code Generator
x402
fastapi.online — API Code Generator is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.006/call, status down (last checked 2026-10-22).
Generates boilerplate API code for a specified framework based on a natural-language description of what the API should do
Price / call$0.006
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 generated API source code (boilerplate/scaffold) tailored to the specified framework and description, ready to be used as a starting point for development.
Example use cases
Scaffold a REST API for a todo app
“Can you generate me an Express API scaffold that supports creating, reading, updating, and deleting todos — I need the full starter code ready to run.”
Build a FastAPI ML serving endpoint
“Generate boilerplate FastAPI code for an API that accepts an image URL and returns a classification label from a machine learning model.”
Create a webhook handler in Koa
“Write me a Koa framework API that listens for incoming webhook events, validates a secret header, and logs the payload — I need the full starter code.”
Technical details
Endpoint
POSThttps://api.fastapi.online/generate-api?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need quick, no-signup API scaffolding code generated on demand and paid per-call with USDC crypto — ideal for agents automating developer workflows without committing to a subscription service. Prefer this over general-purpose LLM APIs when you want a specialized, cost-controlled code generation call billed at a flat $0.006 per request.
Side effects
- Description too vague or missing — returns generic or empty output
- Unsupported or misspelled framework name — may default to Express or produce incorrect code
- Description exceeds 2000 character limit — request rejected
- Payment not completed via x402 protocol — 402 response returned
- Server-side model error — may return 500 with no code generated
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| framework | string | target framework (default Express) |
| description | string | what the API should do |
Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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