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fastapi.online Antonym Suggest
x402
fastapi.online Antonym Suggest is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.0005/call, status unknown (last checked 2026-09-14).
Returns a list of antonyms for a given word, up to a specified count
Price / call$0.0005
Success—
StatusUnknown
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
A list of antonym words (up to the requested count) for the input word, returned as structured data suitable for display or further processing in a writing or vocabulary application.
Example use cases
Vocabulary enrichment for writing
“I'm writing an essay and need some variety — can you give me 8 antonyms for the word 'bold' so I can pick the best fit?”
Language learning flashcard generation
“I'm building antonym flashcards for English learners — give me 10 antonyms for the word 'happy'.”
Crossword puzzle clue solver
“I'm stuck on a crossword clue asking for an opposite of 'ancient' — can you suggest 3 antonym options?”
Technical details
Endpoint
POSThttps://api.fastapi.online/antonym-suggestWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-call antonym lookup without requiring an account or subscription. Ideal for agents building vocabulary tools, writing assistants, or language learning apps that need quick opposite-word suggestions at very low cost ($0.0005 per call). Prefer alternatives if you need rich context, example sentences, or part-of-speech filtering alongside antonyms.
Side effects
- Word not found or no antonyms available in the model's vocabulary — may return empty list or error
- Invalid input: word exceeds 100 characters or count exceeds 20 — returns validation error
- Network or service unavailability — returns 5xx error
- Payment not processed or insufficient funds — returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| word | string | |
| count | integer |
Tags
x402
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