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Soundex Phonetic Code & Name Comparison
x402
Soundex Phonetic Code & Name Comparison is a paid API for AI agents from text-similarity.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-21).
Computes the American Soundex code for a name and optionally compares two names to determine whether they sound alike.
Price / call$0.02
Success—
StatusUnknown
How this service works
American Soundex code of a name (R163 for Robert), with an optional second name to test whether they sound alike.
Output
Returns the Soundex code string for the input name (e.g. R163 for Robert), the variant used, and — if a second name was provided — the Soundex code of that name, a boolean indicating whether the two codes match, a verdict string, a summary explanation, and a list of reasons supporting the verdict.
Example use cases
Genealogy name variant matching
“I'm searching old census records and want to know if the name 'Hoffmann' and 'Hofman' would have the same Soundex code — can you check using American Soundex?”
Customer record deduplication
“We have two customer entries: 'Catherine Burns' and 'Kathryn Berns'. Do these names sound alike under Soundex? Use the american variant.”
Phonetic code lookup for indexing
“What is the Soundex code for the surname 'Wojciechowski' so I can use it in a phonetic index?”
Technical details
Endpoint
GEThttps://text-similarity.x402tookit.com/soundex?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need classical American Soundex encoding, especially for genealogical research, historical record linkage, or legacy database phonetic matching that specifically uses the Soundex standard. Prefer it over Metaphone or Jaro-Winkler sibling endpoints when the target system or index is Soundex-based, or when you need the simple variant (H and W treated as separators). Use the optional second-name comparison parameter when you want a direct same-code verdict rather than computing two codes separately.
Side effects
- Name contains no usable letters (all digits or symbols) — returns null code
- Name exceeds 200 characters — request rejected or truncated
- Invalid variant value — falls back to american default or returns error
- Network timeout — no response returned
- Non-ASCII characters present — accents stripped before processing, may alter expected code
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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