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Original Metaphone Phonetic Key
x402
Original Metaphone Phonetic Key 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 Original Metaphone (Philips 1990) phonetic key for an English word, and optionally compares two words to determine if they share the same key.
Price / call$0.02
Success—
StatusUnknown
How this service works
Original Metaphone (Philips 1990, not Double) phonetic key of an English word, with optional second word to compare.
Output
Returns the Original Metaphone key for the input word, and if a second word is provided, also returns its Metaphone key, a boolean indicating whether both keys match, a summary, a verdict, and reasons explaining the comparison result. May also include source, variant, degraded flag, disclaimer, and any unchecked aspects.
Example use cases
Name deduplication in a customer database
“I have two customer records — one spelled 'Thompson' and one spelled 'Thomson' — can you check if they share the same Original Metaphone key so I can decide whether they're likely the same person?”
Phonetic spelling validation for a form
“Get the Original Metaphone phonetic key for the name 'Catherine' so I can group it with other spelling variants that sound the same.”
Fuzzy name search in a genealogy app
“Do 'Caughey' and 'Kahee' produce the same Metaphone key? I'm trying to match historical records where names were spelled phonetically by census takers.”
Technical details
Endpoint
GEThttps://text-similarity.x402tookit.com/metaphone?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you specifically need the Original Metaphone algorithm (Philips 1990) rather than Double Metaphone or Soundex. It is ideal for phonetic deduplication of English names and words, fuzzy name matching, and detecting spelling variants that sound the same. Prefer this over Soundex when you need a more nuanced phonetic encoding, and over Levenshtein when pronunciation similarity matters more than character-level edit distance.
Side effects
- Word contains non-letter characters — only letters are used, non-letter characters are stripped or ignored
- Word exceeds 200 characters — input is truncated or rejected
- Empty or missing 'word' parameter — returns an error since it is required
- Word is not an English word — Metaphone may produce unexpected or empty keys for non-English vocabulary
- Unrecognized edge cases in Philips 1990 algorithm — result may differ from implementations of Double Metaphone
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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