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fastapi.online Synonym Suggest
x402
fastapi.online Synonym 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 synonyms 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 synonym words (up to the requested count) for the input word, returned as structured data from a self-hosted NLP model.
Example use cases
Diversify word choice in essays
“I'm writing an essay and I've used the word 'important' too many times — give me 10 synonyms for it so I can mix things up.”
Expand vocabulary for content creation
“I need 5 synonyms for the word 'innovative' to use in a marketing blog post — can you look those up for me?”
Build a thesaurus-style feature in an app
“For my writing assistant app, fetch me up to 15 synonyms for the word 'happy' so I can populate the suggestions panel.”
Technical details
Endpoint
POSThttps://api.fastapi.online/synonym-suggestWhen to prefer
Choose this endpoint when you need quick, pay-per-call synonym suggestions without signup, especially in agent workflows where no Merriam-Webster or Thesaurus.com API key is available. Best for lightweight vocabulary enrichment tasks where cost per call ($0.0005 USDC) is preferable to subscription-based alternatives. Ideal for anonymous, one-off lookups paid with crypto.
Side effects
- Word not recognized or too obscure — may return empty synonym list
- Count exceeds maximum of 20 — request rejected with validation error
- Empty or blank word input — returns 400 validation error
- Word with length over 100 characters — rejected by schema
- Network or model inference failure — returns 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| word | string | |
| count | integer |
Tags
x402
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