# fastapi.online — Generate Auth Code

> fastapi.online — Generate Auth Code is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.006/call, status down (last checked 2026-10-19).

Generates authentication scaffolding code for a given tech stack with specified auth providers (e.g. email, Google, GitHub).

## Facts

- Endpoint: POST https://api.fastapi.online/generate-auth?utm_source=zero.xyz
- Price: $0.006/call
- Payment: x402
- Status: down
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fastapi-online-generate-auth-code-24103a21
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Q2Y23FojV2AZU8Fbnf0Qh

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability fastapi-online-generate-auth-code-24103a21 -d '<json body>'
```

Example prompt: Generate auth code for my Next.js + Prisma stack with email, Google, and GitHub as providers.

## When to prefer this

Choose this endpoint when you need instant, no-signup auth code generation for a specific tech stack with named providers, and you want to pay per call with crypto rather than subscribe to a SaaS auth platform. Best for developers scaffolding a new project or prototyping authentication quickly.

## Known failure modes

- Stack description too short or vague — may produce generic or irrelevant code
- Unsupported providers specified — may be ignored or cause errors
- Ambiguous stack input — model may make incorrect assumptions about framework versions or structure
- Payment failure — endpoint returns 402 if payment not completed

## How this service works

Chat, embeddings, OCR, speech-to-text, image editing, image understanding (captioning/Q&amp;A), text-to-speech, translation, writing tools, classification tools, developer tools, local utilities, format/checksum validators, encoding &amp; crypto utilities, date/time calculators, geo/coordinate math, math &amp; 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 authentication code or scaffolding tailored to the specified tech stack and auth providers, ready to integrate into the project.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "stack": {
   "type": "string",
   "maxLength": 2000,
   "minLength": 2,
   "description": "the stack to add auth to"
  },
  "providers": {
   "type": "string",
   "maxLength": 300,
   "description": "e.g. email, google, github"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fastapi-online-generate-auth-code-24103a21/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.fastapi.online](https://www.zero.xyz/host/api.fastapi.online/llms.txt)