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Vextorium Password Strength Estimator (zxcvbn)
x402
Vextorium Password Strength Estimator (zxcvbn) is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-16).
Estimates password strength using Dropbox's zxcvbn algorithm, returning a score 0–4, crack time estimates for online/offline attacks, weak patterns detected, and improvement tips — evaluated in memory, never stored.
Price / call$0.003
Success—
StatusUnknown
How this service works
Estimate password strength with Dropbox's zxcvbn: score 0-4, estimated guesses and crack time for online and offline attacks, weak patterns found (dictionary, dates, sequences...) and tips. Evaluated in memory, never stored or logged.
Output
Returns a JSON object with: a numeric score (0–4), a human-readable strength level (e.g. 'muy débil'), estimated number of guesses, crack times for four attack scenarios (online unlimited, online rate-limited, slow offline hash, fast offline hash), an array of detected weak pattern types (e.g. 'dictionary', 'date', 'sequence'), an array of improvement tips, an optional warning message, and a privacy note confirming the password is never stored.
Example use cases
Pre-registration password gate
“Before I let a new user finish signing up, check whether their password 'dragon123' is strong enough — give me the score out of 4, how long it'd take to crack offline, and any weak patterns so I can show them a helpful error message.”
Security audit of existing passwords
“Can you evaluate the strength of the password 'P@ssw0rd!' using zxcvbn? I need the numeric score, the human-readable strength level, estimated guesses, and any improvement tips.”
Developer password policy testing
“I'm building a signup form and want to test how zxcvbn rates the password 'correct-horse-battery-staple' — what score does it get, what crack times does it estimate for fast and slow offline attacks, and does it flag any weak patterns?”
Technical details
Endpoint
POSThttps://api.vextorium.com/fuerza-contrasena-pago?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, privacy-respecting, in-memory password strength analysis powered by Dropbox's well-established zxcvbn algorithm, especially when you want structured crack-time estimates across multiple attack scenarios and actionable tips — without risk of the password being logged or stored server-side.
Side effects
- Missing 'contrasena' field in request body returns validation error
- Empty or null password string may return a score of 0 with no patterns
- Network timeout if the service is temporarily unavailable
- Invalid bodyType value causes request rejection
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| contrasena | string |
Output
Schema · Response
{
"type": "json",
"example": {
"nota": "La contraseña se analiza en memoria y no se almacena. Mejor aún: evalúala en local y no la envíes a ningún servicio.",
"aviso": "This is a very common password.",
"nivel": "muy débil",
"consejos": [
"Add another word or two. Uncommon words are better."
],
"longitud": 11,
"puntuacion": 0,
"patrones_debiles": [
"dictionary"
],
"tiempo_descifrado": {
"online": "60 seconds",
"online_limitado": "6 hours",
"offline_hash_lento": "less than a second",
"offline_hash_rapido": "less than a second"
},
"intentos_estimados": "596"
}
}Tags
x402
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