String Similarity (Levenshtein)
String similarity: compare two strings and return every standard 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.
Offering
- Provider
- api.duoleads.com
- Method
- GET
- Offering type
- Api Endpoint
- Transport type
- http
- Category
- General Utilities
- Delivery
- Not provided
- Pricing model
- Not provided
- x402 version
- 2
Endpoint context
- URL
https://api.duoleads.com/v1/text/similarity- MIME type
- application/json
- First seen
- 2026-10-16T01:50:38.788Z
- Last seen
- Tags
- string-similarity, levenshtein, edit-distance, similarity, phonetic
Payment pricing
x402 payment terms are the authoritative price for calling this endpoint.
- Payment option 1
- 0.05 USDC
Atomic price: 50000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
{
"scheme": "exact",
"network": "eip155:8453",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "50000",
"payTo": "0xCD673f7e1daD254347AEab6be0DEFe8b9C6b3A39"
}
]Observed health
- Status
- Healthy
- Latest latency
- 33 ms
- Average latency
- 476 ms
- HTTP status
- 402
- Last checked
- Reachability
- 100% over 13 checks
Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.
Input schema
{
"type": "object",
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"type": "string",
"enum": [
"GET"
]
},
"queryParams": {
"type": "object",
"properties": {
"a": {
"type": "string",
"description": "First string, at most 512 characters.",
"maxLength": 512
},
"b": {
"type": "string",
"description": "Second string, at most 512 characters.",
"maxLength": 512
},
"fold": {
"type": "string",
"description": "Comma-separated folds before comparing: case, accents, space, punct. Default case.",
"maxLength": 64,
"default": "case"
},
"only": {
"type": "string",
"description": "Comma-separated measure names to compute: levenshtein, damerau_levenshtein, normalised_similarity, jaro, jaro_winkler, lcs_length, dice, phonetic (all three keys), soundex, metaphone, nysiis. Default all.",
"maxLength": 256
}
},
"required": [
"a",
"b"
]
}
},
"required": [
"type",
"method"
],
"additionalProperties": false
}Output schema
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"a": {
"description": "First string, at most 512 characters.",
"maxLength": 512,
"type": "string"
},
"b": {
"description": "Second string, at most 512 characters.",
"maxLength": 512,
"type": "string"
},
"fold": {
"default": "case",
"description": "Comma-separated folds before comparing: case, accents, space, punct. Default case.",
"maxLength": 64,
"type": "string"
},
"only": {
"description": "Comma-separated measure names to compute: levenshtein, damerau_levenshtein, normalised_similarity, jaro, jaro_winkler, lcs_length, dice, phonetic (all three keys), soundex, metaphone, nysiis. Default all.",
"maxLength": 256,
"type": "string"
}
},
"required": [
"a",
"b"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"data": {
"properties": {
"damerau_levenshtein": {
"type": "number"
},
"dice": {
"type": "number"
},
"equal_after_fold": {
"type": "boolean"
},
"folded": {
"properties": {
"a": {
"type": "string"
},
"b": {
"type": "string"
}
},
"required": [
"a",
"b"
],
"type": "object"
},
"jaro": {
"type": "number"
},
"jaro_winkler": {
"type": "number"
},
"lcs_length": {
"type": "integer"
},
"levenshtein": {
"type": "number"
},
"normalised_similarity": {
"type": "number"
},
"phonetic": {
"properties": {
"a": {
"properties": {
"metaphone": {
"type": "string"
},
"nysiis": {
"type": "string"
},
"soundex": {
"type": "string"
}
},
"type": "object"
},
"b": {
"properties": {
"metaphone": {
"type": "string"
},
"nysiis": {
"type": "string"
},
"soundex": {
"type": "string"
}
},
"type": "object"
}
},
"required": [
"a",
"b"
],
"type": "object"
}
},
"required": [
"equal_after_fold",
"folded"
],
"type": "object"
},
"meta": {
"properties": {
"computed_at": {
"description": "RFC 3339 UTC with milliseconds",
"type": "string"
},
"deterministic": {
"type": "boolean"
},
"disclaimer": {
"type": "string"
},
"price_usd": {
"type": "string"
},
"request_id": {
"type": "string"
},
"sources": {
"items": {
"required": [
"id",
"version",
"published"
],
"type": "object"
},
"type": "array"
}
},
"required": [
"request_id",
"computed_at",
"price_usd",
"deterministic",
"disclaimer"
],
"type": "object"
},
"ok": {
"const": true
},
"route": {
"const": "/v1/text/similarity"
},
"version": {
"type": "string"
}
},
"required": [
"ok",
"route",
"version",
"data",
"meta"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}