# fastapi.online — Jargon Explain

> fastapi.online — Jargon Explain is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Takes a text containing technical jargon or specialized terminology and returns plain-language explanations of the jargon found within it.

## Facts

- Endpoint: POST https://api.fastapi.online/jargon-explain
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fastapi-online-jargon-explain-3efe3b26
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_si7F5zo8pnCGyA_MQUNLx

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-jargon-explain-3efe3b26 -d '<json body>'
```

Example prompt: Can you explain the jargon in this text for me: 'The SLA guarantees 99.9% uptime with P1 incident SLOs and a TTR of under 4 hours for SEV1 outages'? I want plain-English definitions of all the technical terms.

## When to prefer this

Choose this endpoint when you need to automatically identify and explain jargon, buzzwords, or specialized terminology within a passage of text at low cost ($0.001/call) without requiring a signup. It is well-suited for agents processing documents, emails, or articles in technical domains (medical, legal, finance, tech) where end users lack domain expertise. Prefer it over a general-purpose chat model call when you want a focused, cheap, pay-per-use explanation of terminology rather than a full conversational exchange.

## Known failure modes

- Empty or whitespace-only text input returns a validation error
- Text exceeding 8000 characters is rejected
- If the text contains no recognizable jargon, the response may return minimal or generic output
- Network timeout or inference backend unavailability may return a 5xx error
- Payment failure via x402 protocol prevents access

## 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

The endpoint returns plain-language explanations of the specialized, technical, or industry-specific terms found in the submitted text, helping non-experts understand the content without prior domain knowledge.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fastapi-online-jargon-explain-3efe3b26/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)