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PennyRail Word Frequency / Term Frequency Analyzer
x402
PennyRail Word Frequency / Term Frequency Analyzer is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Computes word frequency (term frequency) counts for all tokens in a given text input
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
A JSON object mapping each unique word (token) found in the input text to its occurrence count or frequency score, enabling downstream NLP tasks such as TF-IDF computation, keyword analysis, or vocabulary profiling.
Example use cases
SEO keyword density audit
“Here's the body copy from my landing page — can you tell me how frequently each word appears so I can see if my target keyword 'conversion' is showing up enough? [paste text]”
Academic plagiarism pre-screening
“I have this student essay and I want to see the term frequency breakdown for every word in it — can you run word frequency analysis on it for me?”
TF-IDF preprocessing for search index
“Before I build my TF-IDF scores, I need raw word counts for this document: 'Artificial intelligence is transforming the way we build software. Software built with AI learns from data.' Can you give me the frequency of every term?”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/p/nano/text.word-frequency--term-frequencyWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-use word frequency computation without setting up your own NLP pipeline. It is ideal for one-off document analysis, preprocessing steps for TF-IDF, or when you want a serverless micro-service approach at $0.001 per call. Prefer alternatives if you need advanced NLP (stemming, lemmatization, stop-word removal) or batch processing of many documents simultaneously.
Side effects
- Empty or missing 'input' field returns a validation error
- Extremely long texts may time out or be truncated
- Non-UTF-8 encoded text may cause parsing errors
- Punctuation handling and tokenization behavior may differ from expectations (e.g. hyphenated words)
- Rate limiting or payment failure returns 402 if USDC balance is insufficient
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | string |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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