# Password Strength Scorer

> Password Strength Scorer is a paid API for AI agents from api.24klabs.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).

Scores a password by length, character classes, and estimated entropy (bits) to gauge its strength.

## Facts

- Endpoint: POST https://api.24klabs.ai/api/password-strength
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/password-strength-scorer-4c00d545
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HQRaB561xbFM6X7yzkG4b

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 password-strength-scorer-4c00d545 -d '<json body>'
```

Example prompt: Can you check how strong the password 'Tr0ub4dor&3!' is — tell me its entropy in bits and which character classes it uses?

## When to prefer this

Use this endpoint when you need a quick, deterministic, server-side password strength evaluation based on entropy estimation and character class analysis — ideal for form validation, registration flows, or security audits. Prefer it over client-side libraries when you want a consistent, backend-enforced scoring standard or when operating in an agent workflow that requires a structured API response.

## Known failure modes

- Empty or missing password field returns validation error
- Extremely long passwords may be truncated or rejected
- Non-UTF-8 or binary input may cause parsing errors
- Network timeout for slow connections

## How this service works

Score a password by length, character classes, and estimated entropy (bits).

## Output

Returns a strength score, estimated entropy in bits, breakdown of character classes present (uppercase, lowercase, digits, symbols), length evaluation, and an overall password quality rating.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "score": 3,
  "entropy_bits": 72.1
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/password-strength-scorer-4c00d545/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.24klabs.ai](https://www.zero.xyz/host/api.24klabs.ai/llms.txt)