# Vextorium Password Strength Estimator

> 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.

## Facts

- Endpoint: POST https://api.vextorium.com/v1/password-strength?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vextorium-password-strength-estimator-6ac8140a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WGMeQKPLMwU1UK3RUwlPk

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability vextorium-password-strength-estimator-6ac8140a -d '<json body>'
```

Example prompt: How strong is the password 'Tr0ub4dor&3'? Give me the zxcvbn score, crack time estimates for online and offline attacks, any weak patterns found, and tips to improve it.

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "required": [
      "password"
     ],
     "properties": {
      "password": {
       "type": "string"
      }
     }
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": [
      "object",
      "null"
     ],
     "properties": {
      "note": {
       "type": [
        "string",
        "null"
       ]
      },
      "tips": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": [
         "null",
         "string"
        ]
       }
      },
      "level": {
       "type": [
        "string",
        "null"
       ]
      },
      "score": {
       "type": [
        "number",
        "null"
       ]
      },
      "length": {
       "type": [
        "number",
        "null"
       ]
      },
      "notice": {
       "type": [
        "string",
        "null"
       ]
      },
      "time_to_crack": {
       "type": [
        "object",
        "null"
       ],
       "properties": {
        "online": {
         "type": [
          "string",
          "null"
         ]
        },
        "limited_online": {
         "type": [
          "string",
          "null"
         ]
        },
        "fast_offline_hash": {
         "type": [
          "string",
          "null"
         ]
        },
        "slow_offline_hash": {
         "type": [
          "string",
          "null"
         ]
        }
       }
      },
      "weak_patterns": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": [
         "null",
         "string"
        ]
       }
      },
      "estimated_attempts": {
       "type": [
        "string",
        "null"
       ]
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "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"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vextorium-password-strength-estimator-6ac8140a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.vextorium.com](https://www.zero.xyz/host/api.vextorium.com/llms.txt)