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Delx Similarity
x402
Delx Similarity is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).
Computes normalized Levenshtein string similarity between two input strings, returning a score between 0 and 1.
Price / call$0.001
Success—
StatusUnknown
How this service works
Normalized string similarity (Levenshtein) for $0.001 USDC. Call when you need this bounded result without an API key or subscription. Returns machine-readable JSON via x402 on Base or Solana. Limitation: results cover only the supplied input or one bounded public endpoint at request time; callers must verify before acting.
Output
Returns a normalized floating-point similarity score between 0.0 (completely different) and 1.0 (identical) based on the Levenshtein edit distance between the two input strings, along with potentially the raw edit distance count.
Example use cases
Deduplicating customer name records
“Check how similar 'Jonathan Smith' and 'Johnathan Smyth' are — I need a normalized similarity score to decide if they're duplicates in my customer database.”
Fuzzy matching product titles
“Score the similarity between 'Apple iPhone 14 Pro Max 256GB' and 'Apple iPhone 14 Pro Max 256 GB Space Black' so I can decide if they're the same product listing.”
Spell-check candidate validation
“How similar is the user's typed word 'recieve' to the correct spelling 'receive'? Give me a normalized score so I can decide whether to auto-correct it.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/similarityWhen to prefer
Use this endpoint when you need a quick, normalized string similarity score based on character-level edit distance (Levenshtein) — ideal for fuzzy deduplication, spell-check validation, name matching, or any scenario where you need a single 0–1 similarity metric without setting up a local NLP library. Prefer it over semantic similarity endpoints when character-level closeness (typos, minor spelling variants) matters more than meaning.
Side effects
- Missing or empty input strings returns a validation error
- Non-string inputs may cause a 400 bad request
- Payment failure or insufficient USDC balance causes a 402 Payment Required response
- Extremely long strings may time out or be rejected due to size limits
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Output
Schema · Response
{
"type": "json",
"example": {}
}Tags
x402
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