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Unicode Confusables Checker
x402
Unicode Confusables Checker is a paid API for AI agents from fastx402.tools, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-19).
Detects Unicode homoglyph/confusable characters in text that could be used for spoofing or phishing attacks
Price / call$0.002
Success—
StatusUnknown
How this service works
216 pay-per-call tools for AI agents, from $0.001 per request in USDC on Base or Solana with x402. No account, no API key.
Output
Returns a JSON object with the original text, a normalized (ASCII-equivalent) version, a boolean is_suspicious flag, and an array of flagged_characters. Each flagged character includes its position in the string, the character itself, its Unicode codepoint, the script it belongs to (e.g. Cyrillic), and an array of ASCII characters it can be confused with.
Example use cases
Phishing URL detection in email
“I got an email with a link to 'аpple.com' — can you check if that domain is using any fake lookalike Unicode characters that make it look like the real Apple site?”
Validating user-submitted usernames
“A new user signed up with the username 'аdmin' — check if it contains any confusable Unicode characters that could be impersonating our admin account.”
Brand protection monitoring
“Someone registered 'mісrosoft.com' — can you analyze that string to see if any characters are Unicode lookalikes designed to spoof the Microsoft brand?”
Technical details
Endpoint
GEThttps://fastx402.tools/unicode-confusables?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to detect Unicode homoglyph or lookalike character attacks in domain names, URLs, usernames, or any text identifier where spoofing is a concern. It is particularly valuable for IDN homograph attack detection and phishing URL validation. Prefer this over general-purpose text analysis when the specific concern is Unicode-based visual deception rather than semantic content.
Side effects
- Missing 'text' query parameter returns an error
- Empty string input may return no flagged characters with is_suspicious: false
- Very long strings may exceed processing limits
- Non-string input types will fail schema validation
- Payment failure via x402 returns HTTP 402 before processing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"text": "pаypal.com",
"normalized": "paypal.com",
"is_suspicious": true,
"flagged_characters": [
{
"script": "Cyrillic",
"position": 1,
"character": "а",
"codepoint": "U+0430",
"confusables": [
"a"
]
}
]
}
}Tags
x402
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