# agent402.tools Password Strength Scorer

> agent402.tools Password Strength Scorer is a paid API for AI agents from agent402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Analyzes a password's strength by computing character-set size, entropy bits, a 0–4 rating, and an estimated offline crack time — without storing or logging the password.

## Facts

- Endpoint: POST https://agent402.tools/api/password-strength
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent402-tools-password-strength-scorer-c70c90bd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_65zjEN93L4_6akqT1fAZd

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 agent402-tools-password-strength-scorer-c70c90bd -d '<json body>'
```

Example prompt: How strong is the password 'Tr0ub4dor&3'? Give me its entropy, character-set size, 0–4 rating, and how long it would take to crack offline.

## When to prefer this

Use this endpoint when you need a quick, privacy-safe server-side password strength evaluation that returns entropy bits, character-set size, a standardized 0–4 rating, and a crack-time estimate — particularly when you want a consistent scoring model without implementing your own entropy calculator.

## Known failure modes

- Missing or empty password field returns a validation error
- Extremely long passwords may cause processing delays or be rejected
- Non-string password values may return a type error
- Payment failure (x402) if USDC balance is insufficient or payment not attached

## How this service works

Score a password's strength: character-set size, entropy bits, a 0–4 rating, and an estimated offline crack time. The password is never stored or logged.

## Output

Returns the password's character-set size, entropy in bits, a numeric strength rating from 0 (very weak) to 4 (very strong), and an estimated time to crack the password offline. The password is never stored or logged.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "password": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "score": 3,
  "rating": "strong",
  "crackTime": "centuries",
  "entropyBits": 72
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent402-tools-password-strength-scorer-c70c90bd/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent402.tools](https://www.zero.xyz/host/agent402.tools/llms.txt)