Sentiment + language + statistics
API · /nlp-api
Sentiment & NLP API
healthy
3,262 Subscribers
Analyse text in real time: sentiment scoring (positive / negative / neutral with the matched words), automatic language detection across 180+ languages, and a combined analysis endpoint with text statistics. No setup, no model hosting.
api.oanor.com/nlp-api
API health
healthy- Uptime
- 100.00%
- Server probes · 24h
- Avg latency
- 79 ms
- Server probes · 24h
- Subscribers
- 3,262
- active
- Total calls
- 54
- last 7 days
Pricing
Pick a tier — billed monthly, cancel anytime.
Free
Free
- 5,000 calls / month
- 2 requests / second
- Hard cap (429 above quota, no overage)
- 5,000 calls/month at 2 req/s
- No credit card
- Sentiment scoring + language detection (180+ languages)
Basic
€14.00 /month
- 120,000 calls / month
- 8 requests / second
- Hard cap (429 above quota, no overage)
- 120,000 calls/month at 8 req/s
- Combined analysis endpoint with text statistics
- Commercial use allowed
- Email support
Pro
€42.00 /month
- 600,000 calls / month
- 25 requests / second
- Hard cap (429 above quota, no overage)
- 600,000 calls/month at 25 req/s
- All endpoints incl. batch text analysis
- Priority email support
- Undercuts Twinword Ultra ($99/750k)
Mega
€119.00 /month
- 2,500,000 calls / month
- 60 requests / second
- Hard cap (429 above quota, no overage)
- 2,500,000 calls/month at 60 req/s
- 99.9% uptime SLA
- Priority support with 24h response
- Higher quota than Twinword Mega at under half the price
Built by
Related APIs
Other APIs with overlapping tags.
Jisho Japanese Dictionary API
Japanese-English dictionary data via the open Jisho.org API (no key). The search endpoint queries the dictionary for words and kanji compounds and accepts English, romaji, kana or kanji as input; each entry carries its Japanese writings (word + reading), English senses with parts of speech and usage tags, JLPT level and a common-word flag, with an optional filter for common words only. The word endpoint returns the single best — preferably common — match for a keyword, ideal for quick look-ups and language tools. Real dictionary data straight from Jisho, cached briefly for speed — no key. 3 endpoints. Ideal for language-learning apps, furigana and reading helpers, vocabulary tools and Japanese NLP enrichment.
api.oanor.com/jisho-api
N-gram API
Generate n-grams from text, with frequency counts — entirely locally. The ngrams endpoint breaks text into contiguous sequences of n tokens and returns each distinct n-gram with how often it occurs, ranked by frequency: word n-grams (unigrams, bigrams, trigrams and beyond) for phrase and collocation analysis, or character n-grams (shingles) for fuzzy matching, language detection and indexing. The range endpoint produces every size from a minimum to a maximum in a single call (for example 1–3 grams), which is exactly what you need to build feature vectors. Choose word or character mode, whether to lower-case first, and a top-N limit to keep only the most frequent. Word tokenization is Unicode-aware and keeps internal apostrophes and hyphens (don't, well-known) as single tokens. Everything runs locally and deterministically, so it is fast and private. Ideal for text mining and NLP feature extraction, language modelling and autocomplete, search indexing and shingling, plagiarism and similarity detection, and keyword and collocation analysis. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This produces n-grams and counts; for extractive summaries and keywords use a summarize API and for grapheme/character counting use a text-segmentation API.
api.oanor.com/ngram-api
Summarize API
Summarize text and pull out its keywords — no AI key, no external model. The summarize endpoint is extractive: it scores every sentence by word frequency and position and returns the most representative ones (ask for a fixed number of sentences or a fraction of the original), keeping the author's exact wording and order. The keywords endpoint ranks the most salient terms with their counts and a relative score, filtering out stopwords. Because it is deterministic and runs locally, the same text always gives the same result, instantly and privately. Perfect for article previews and TL;DRs, search snippets, tagging and content triage, and feeding shorter context to downstream tools. Pure local computation — no third-party service; send long text via POST. Live, nothing stored. 3 endpoints. Distinct from sentiment/NLP analysis, stopword lists and Unicode text segmentation.
api.oanor.com/summarize-api
Stemmer API
Reduce words to their linguistic root (stem) with the classic Snowball stemming algorithms — running → run, fishing → fish, nationalization → nation — across 24 languages including English, German, French, Spanish, Italian, Portuguese, Dutch, Russian, Arabic, Finnish, Swedish and more. Stem a whole text (every word, returning both the per-word mapping and the fully stemmed text) or a single word. Stemming is the core normalisation step behind search engines, query expansion, text indexing, keyword matching and NLP preprocessing. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. Distinct from sentiment/NLP analysis and fuzzy string matching.
api.oanor.com/stemmer-api
Frequently asked questions
Quick answers about pricing, quotas, and integration.
How do I get an API key for Sentiment & NLP API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Sentiment & NLP API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Sentiment & NLP API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does Sentiment & NLP API cost?
Sentiment & NLP API has a free tier with 100 calls / month. Paid plans start at €14.00 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is Sentiment & NLP API GDPR-compliant?
All requests to Sentiment & NLP API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.
Pick an endpoint from the list on the left to see its details and try it.
Code snippets
Sign up to get an API key, then call any path under your slug.
curl https://api.oanor.com/nlp-api/SOME_PATH \
-H "x-oanor-key: oanor_test_..."const res = await fetch("https://api.oanor.com/nlp-api/SOME_PATH", {
headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();$ch = curl_init("https://api.oanor.com/nlp-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);import requests
r = requests.get(
"https://api.oanor.com/nlp-api/SOME_PATH",
headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())Ratings
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