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Duo Data Utilities – Text Similarity
x402
Duo Data Utilities – Text Similarity is a paid API for AI agents from api.duoleads.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-02).
Compare two strings and return a comprehensive suite of similarity metrics including edit distances, phonetic keys, and token-based scores in a single call.
Price / call$0.05
Success—
StatusUnknown
How this service works
Compare two strings and return every standard similarity measure in one call: Levenshtein and Damerau-Levenshtein edit distance, normalised similarity, Jaro and Jaro-Winkler, longest common subsequence, Dice coefficient on character bigrams, and the Soundex, Metaphone and NYSIIS phonetic keys of each string. Optional case folding, accent folding and whitespace normalisation before comparison.
Output
A JSON object containing: all requested similarity scores (Levenshtein, Damerau-Levenshtein, normalised similarity, Jaro, Jaro-Winkler, LCS length, Dice coefficient), phonetic keys for each input string (Soundex, Metaphone, NYSIIS), the folded versions of both strings, and whether they are equal after folding. Also includes metadata: request ID, computation timestamp, price, and a determinism flag.
Example use cases
Deduplicating customer name records
“I have two customer names, 'Jon Smith' and 'John Smyth' — can you run them through every similarity measure (Levenshtein, Jaro-Winkler, Soundex, Metaphone, all of it) with case and accent folding so I can decide if they're the same person?”
Fuzzy product title matching for e-commerce
“Check how similar 'Apple iPhone 15 Pro Max 256GB' and 'Apple iPhone 15 Pro Max 256 GB' are — give me the normalised similarity score and edit distance so I can set a deduplication threshold.”
Phonetic name matching for search autocomplete
“Do 'Catherine' and 'Kathryn' sound the same according to Soundex, Metaphone, and NYSIIS? Also give me the Jaro-Winkler score between them with case folding on.”
Technical details
Endpoint
GEThttps://api.duoleads.com/v1/text/similarity?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need multiple string similarity metrics in a single call rather than computing them separately. It is ideal for record linkage, deduplication pipelines, name-matching workflows, or any scenario requiring both edit-distance and phonetic comparison simultaneously. Prefer it over rolling your own when you also need phonetic keys (Soundex, Metaphone, NYSIIS) alongside numeric similarity scores without managing multiple libraries.
Side effects
- Missing required parameters 'a' or 'b' — returns 400 error
- String exceeds 512-character limit — returns 400 validation error
- Invalid fold or only parameter values — may return 400 or be silently ignored
- Payment failure (x402) — returns 402 Payment Required if USDC payment is not attached
- Network timeout for repeated rapid calls
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"data": {
"dice": 0.3636363636363636,
"jaro": 0.746031746031746,
"folded": {
"a": "kitten",
"b": "sitting"
},
"phonetic": {
"a": {
"nysiis": "CATAN",
"soundex": "K350",
"metaphone": "KTN"
},
"b": {
"nysiis": "SATANG",
"soundex": "S352",
"metaphone": "STNK"
}
},
"lcs_length": 4,
"levenshtein": 3,
"jaro_winkler": 0.746031746031746,
"equal_after_fold": false,
"damerau_levenshtein": 3,
"normalised_similarity": 0.5714285714285714
},
"meta": {
"price_usd": "0.05",
"disclaimer": "Factual output of a deterministic computation over public data. Provided as is, with no warranty of accuracy, completeness or availability. Not investment, financial, legal, tax, medical or any other professional advice, and not a recommendation. Verify before relying on it. Terms: https://api.duoleads.com/terms",
"request_id": "01K6B7Q4ZC8H3F2M9WXR5TYN0D",
"computed_at": "2026-09-28T12:00:00.000Z",
"deterministic": true
},
"route": "/v1/text/similarity",
"version": "1.0.0"
}
}Tags
x402
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