Text Trust | Apiosk Gateway

About

Unicode homoglyph, domain similarity and text normalization checks for adversarial emails, invoices and scraped pages. Pure computation, no caller API key, no outbound provider dependency. The gateway meters access per request over x402.

Base URL

https://gateway.apiosk.com/text-trust

Technical Specs

Auth Methodx402

Response FormatJSON

Endpoints3

Endpoints

Method	Path	Description	Cost
POST	/check/domain-similarity	Compare a domain against a caller allowlist using edit distance and visual confusable skeleton similarity.	$0.02 default	View details
POST	/check/homoglyphs	Detect mixed-script and confusable Unicode characters and return exact offending codepoints.	$0.02 default	View details
POST	/normalize/text	Apply NFKC normalization and remove zero-width and bidi override characters, returning cleaned text plus a removal report.	$0.02 default	View details

Endpoint documentation

POST/check/domain-similarity

$0.02 default

Description

Compare a domain against a caller allowlist using edit distance and visual confusable skeleton similarity.

Pricing

$0.02 default

Request schema

{
  "properties": {
    "allowlist": {
      "items": {
        "type": "string"
      },
      "type": "array"
    },
    "domain": {
      "type": "string"
    }
  },
  "required": [
    "domain",
    "allowlist"
  ],
  "type": "object"
}

Response schema

{
  "properties": {
    "best_match": {
      "type": "object"
    },
    "matches": {
      "items": {
        "type": "object"
      },
      "type": "array"
    },
    "suspicious": {
      "type": "boolean"
    }
  },
  "type": "object"
}

Example request

{
  "allowlist": [
    "paypal.com"
  ],
  "domain": "paypa1.com"
}

Example response

{
  "best_match": {
    "allowed": "paypal.com",
    "visual_distance": 0
  },
  "ok": true,
  "suspicious": true
}

POST/check/homoglyphs

$0.02 default

Description

Detect mixed-script and confusable Unicode characters and return exact offending codepoints.

Pricing

$0.02 default

Request schema

{
  "properties": {
    "text": {
      "type": "string"
    }
  },
  "required": [
    "text"
  ],
  "type": "object"
}

Response schema

{
  "properties": {
    "findings": {
      "items": {
        "type": "object"
      },
      "type": "array"
    },
    "skeleton": {
      "type": "string"
    },
    "suspicious": {
      "type": "boolean"
    }
  },
  "type": "object"
}

Example request

{
  "text": "аpiosk.com"
}

Example response

{
  "findings": [
    {
      "codepoint": "U+0430",
      "looks_like": "a"
    }
  ],
  "ok": true,
  "skeleton": "apiosk.com",
  "suspicious": true
}

POST/normalize/text

$0.02 default

Description

Apply NFKC normalization and remove zero-width and bidi override characters, returning cleaned text plus a removal report.

Pricing

$0.02 default

Request schema

{
  "properties": {
    "text": {
      "type": "string"
    }
  },
  "required": [
    "text"
  ],
  "type": "object"
}

Response schema

{
  "properties": {
    "changed": {
      "type": "boolean"
    },
    "report": {
      "type": "object"
    },
    "text": {
      "type": "string"
    }
  },
  "type": "object"
}

Example request

{
  "text": "abc‮def"
}

Example response

{
  "changed": true,
  "ok": true,
  "report": {
    "removed": [
      {
        "codepoint": "U+200B"
      },
      {
        "codepoint": "U+202E"
      }
    ]
  },
  "text": "abcdef"
}