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API · /soundex-api

Soundex & Fuzzy Match API

healthy 4,783 Subscribers

Phonetic and fuzzy string-matching maths as an API, computed locally and deterministically. The soundex endpoint computes the American Soundex code of a word — the first letter followed by three digits that encode its consonant sounds, ignoring case and non-letters and applying the vowel-reset and adjacent-duplicate rules — so Robert and Rupert both code to R163, Smith and Smyth to S530, and the classic tricky cases Ashcraft (A261), Tymczak (T522) and Pfister (P236) come out right. The levenshtein endpoint computes the edit distance between two strings (the minimum insertions, deletions and substitutions, optionally case-sensitive) and a 0–100 % similarity, so kitten → sitting is three edits and about 57 % similar. The compare endpoint combines both: it reports whether two strings share a Soundex code (sound alike) and their Levenshtein similarity (spelled alike), and flags a likely match when the codes agree or the similarity is at least 80 %. Everything is computed locally and deterministically, so it is instant and private. Ideal for data-deduplication, CRM, fuzzy-search, autocomplete, genealogy and data-cleaning app developers, name-matching and record-linkage tools, and search software. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is phonetic and edit-distance matching; for full-text search use a search API.

#soundex #levenshtein #fuzzy-matching #deduplication #phonetic #developer-tools
api.oanor.com/soundex-api
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Machine-readable spec so AI agents can integrate this API.

/api/soundex-api/openapi.json
/api/soundex-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
87 ms
Server probes · 24h
Subscribers
4,783
active
Total calls
36
last 7 days
status Full status page → · 36 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 6,100 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 6,100 calls/month
  • 2 req/sec
  • Soundex + Levenshtein + compare
  • No credit card
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Starter

€5.45 /month

  • 61,000 calls / month
  • 6 requests / second
  • Hard cap (429 above quota, no overage)
  • 61,000 calls/month
  • 6 req/sec
  • Similarity %, likely-match flag
  • Email support
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Pro

€15.20 /month

  • 285,000 calls / month
  • 15 requests / second
  • Hard cap (429 above quota, no overage)
  • 285,000 calls/month
  • 15 req/sec
  • Dedup & record-linkage pipelines
  • Priority support
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Mega

€47.50 /month

  • 1,490,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 1,490,000 calls/month
  • 40 req/sec
  • Platform scale
  • Dedicated SLA
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Related APIs

Other APIs with overlapping tags.

String Similarity API

A fast, fully-local string similarity and fuzzy-matching toolkit: edit distances (Levenshtein, Damerau-Levenshtein, Hamming), normalized 0-1 similarity scores (Levenshtein ratio, Jaro, Jaro-Winkler, Dice and Jaccard), Soundex phonetic codes, and best-match ranking of a query against a candidate list. Every endpoint accepts input via the query string or the request body. Pure server-side compute, no third-party upstream, so responses are instant and always available. Ideal for record matching and deduplication, search and autocomplete, spell-checking, data cleaning and entity resolution.

api.oanor.com/similarity-api

URL Canonicalize API

Normalize URLs to a canonical form so you can deduplicate, compare and clean them. The canonicalize endpoint lower-cases the scheme and host, drops the default port (80 for http, 443 for https), resolves ./ and ../ path segments and fixes percent-encoding using the standard WHATWG URL parser, then applies the cleanups you choose: strip marketing and analytics tracking parameters (all utm_* plus gclid, fbclid, msclkid, yclid, mc_eid and many more), sort the remaining query parameters into a stable order, optionally drop the #fragment, and add or remove the trailing slash. It returns the canonical URL, the fully parsed components and the exact list of changes it made. The compare endpoint canonicalizes two URLs and tells you whether they point to the same resource — perfect for catching duplicate links that differ only by tracking codes, casing, port or parameter order. Everything is computed locally with no network calls, so it is instant, private and safe. Ideal for crawlers and SEO tooling, link deduplication and analytics, cache keys, bookmarking and content pipelines. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This canonicalizes the URL string; it does not fetch it or follow redirects — for link previews and unshortening use a URL-unfurl API.

api.oanor.com/urlcanon-api

Email Normalize API

Canonicalize email addresses so you can deduplicate accounts and catch different aliases of the same inbox. The normalize endpoint lower-cases the address and applies provider-aware rules: it strips the dots from Gmail and Googlemail local parts (because Gmail ignores them) and maps googlemail.com to gmail.com, removes +tag sub-addressing for Gmail and the many providers that support it — Outlook, Hotmail, Live, iCloud, Fastmail, Proton, Yandex, Zoho, GMX and more — and, by default, for every domain so duplicates never slip through, while reporting exactly which changes it made and which provider it detected. The compare endpoint normalizes two addresses and tells you whether they resolve to the same mailbox. Everything is computed locally and deterministically, with no DNS or network calls, so it is instant and private. Ideal for sign-up and registration dedup, fraud and abuse prevention (one person, many aliases), CRM and mailing-list hygiene, and merging customer records. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This normalizes addresses for comparison; to verify that an address actually exists and can receive mail (MX, disposable, role accounts) use an email-verification API.

api.oanor.com/emailnormalize-api

Perceptual Image Hash API

Fingerprint images for near-duplicate detection and similarity. Compute the three classic perceptual hashes — aHash (average), dHash (difference) and pHash (DCT-based) — as 64-bit hex values for any image (by URL or base64), then compare two images to get the Hamming distance and a 0-100 similarity score per algorithm, with a likely-same flag. Unlike a cryptographic hash, perceptual hashes stay close when images are resized, recompressed or lightly edited — so you can spot duplicates, find re-uploads, cluster similar pictures and power reverse-image matching. Fully local (no third-party service), nothing stored. Supports PNG, JPEG, BMP, TIFF and GIF. Live. 3 endpoints. Distinct from basic image-info/resize and from string-similarity tools.

api.oanor.com/imghash-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Soundex & Fuzzy Match API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Soundex & Fuzzy Match API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Soundex & Fuzzy Match 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 Soundex & Fuzzy Match API cost?
Soundex & Fuzzy Match API has a free tier with 100 calls / month. Paid plans start at €5.45 / 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 Soundex & Fuzzy Match API GDPR-compliant?
All requests to Soundex & Fuzzy Match 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/soundex-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/soundex-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/soundex-api/SOME_PATH");
curl_setopt($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/soundex-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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