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Vextorium Password Strength Estimator
x402
Vextorium Password Strength Estimator is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-11).
Estimates password strength using Dropbox's zxcvbn algorithm, returning a score (0–4), crack time estimates for multiple attack scenarios, detected weak patterns, 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
A JSON object containing: a numeric score from 0 (very weak) to 4 (very strong), a human-readable level label (e.g. 'very weak'), estimated number of guesses to crack, crack time estimates across four scenarios (online throttled, online unthrottled, fast offline hash, slow offline hash), a list of detected weak patterns (e.g. dictionary, dates, sequences), improvement tips, the password's length, and a privacy notice confirming it was analyzed in memory and not stored.
Example use cases
Password policy enforcement for signups
“Before I let this user register, check if their chosen password 'sunshine2024!' is strong enough — give me the score, level, weak patterns, and crack time estimates so I can decide whether to block it.”
Security audit of stored passwords
“I'm reviewing password quality for our accounts. Can you score this password 'P@ssw0rd' using zxcvbn and tell me what patterns make it weak and how long it would realistically take to crack offline?”
Helping a user create a better password
“My user wants to set their password to 'iloveyou123' — tell them the strength score, why it's weak, how quickly it could be cracked, and what they should change to make it stronger.”
Technical details
Endpoint
POSThttps://api.vextorium.com/v1/password-strength?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a detailed, multi-dimensional password strength assessment beyond simple length or regex checks — especially when you want crack time estimates across realistic attack scenarios, weak pattern detection (dictionary words, dates, keyboard sequences), and actionable user-facing tips. It is ideal for signup flows, security audits, or user-facing password feedback. It uses the well-established zxcvbn algorithm with a privacy guarantee that the password is never stored.
Side effects
- Missing required 'password' field returns a validation error
- Empty string password may return a minimal/zero score result
- Extremely long passwords may be truncated or cause unexpected behavior
- Network timeout if the service is temporarily unavailable
- Invalid bodyType enum value causes request rejection
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"note": "The password is analyzed in memory and not stored. Better still: evaluate it locally and do not send it to any service.",
"tips": [
"Add another word or two. Uncommon words are better."
],
"level": "very weak",
"score": 0,
"length": 11,
"notice": "This is a very common password.",
"time_to_crack": {
"online": "60 seconds",
"limited_online": "6 hours",
"fast_offline_hash": "less than a second",
"slow_offline_hash": "less than a second"
},
"weak_patterns": [
"dictionary"
],
"estimated_attempts": "596"
}
}Tags
x402
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