# fastapi.online — Simplify Text

> fastapi.online — Simplify Text is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Rewrites text into simpler, easier-to-understand language at a specified reading level

## Facts

- Endpoint: POST https://api.fastapi.online/simplify-text
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fastapi-online-simplify-text-90c74f84
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CEL1gEz1mHY6zIl7n8bYp

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-simplify-text-90c74f84 -d '<json body>'
```

Example prompt: Can you simplify this paragraph for me so a middle-school student could understand it? Here's the text: 'The mitochondrial electron transport chain facilitates the conversion of chemical energy from nutrients into adenosine triphosphate via oxidative phosphorylation.' Use a basic reading level.

## When to prefer this

Choose this endpoint when you need to reduce the reading complexity of a passage for broader audiences, accessibility compliance, or plain-language communication. Prefer it over a general LLM chat endpoint when you want a dedicated, pay-per-call microservice with no signup required and consistent simplification behavior. Especially useful in automated pipelines simplifying large batches of documents at $0.001 per call.

## Known failure modes

- Text too short (below minLength of 1 character) or too long (above 8000 characters) returns a validation error
- Invalid or unrecognized level value may result in a default level being used or an error
- Payment failure via x402 protocol blocks the request
- Model inference timeout for very long or complex texts
- Empty or whitespace-only text returns an error

## 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 a simplified version of the input text rewritten at the requested reading level, preserving the core meaning while removing complex vocabulary, long sentences, and jargon.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string",
   "maxLength": 8000,
   "minLength": 1
  },
  "level": {
   "type": "string",
   "maxLength": 40
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fastapi-online-simplify-text-90c74f84/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)