# Password Strength Checker with Entropy and Crack Time

> Password Strength Checker with Entropy and Crack Time is a paid API for AI agents from password-strength.api.klymax402.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).

Analyzes a password and returns its strength, entropy score, and estimated time to crack

## Facts

- Endpoint: GET https://password-strength.api.klymax402.com/api/check
- Price: $0.003/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-checker-with-entropy-and-crack-time-fd7da007
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_btaaDI9wK0ClIXZ7NJO8j

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-checker-with-entropy-and-crack-time-fd7da007
```

Example prompt: Can you check how strong the password 'Tr0ub4dor&3' is and tell me its entropy and how long it would take to crack?

## When to prefer this

Use this endpoint when you need to programmatically assess password strength with quantitative metrics like entropy and crack time estimates, rather than just a simple weak/strong label. Ideal for security audit flows, registration validation, or user-facing password feedback.

## Known failure modes

- Missing password parameter returns an error
- Empty string password may return a minimal or zero-strength result
- Extremely long passwords may hit length limits
- Network timeout on the remote API returns no result

## How this service works

Check password strength with entropy and crack time

## Output

Returns a password strength assessment including entropy bits, estimated crack time (e.g. '3 years', 'instantly'), and a strength rating or score indicating how secure the password is.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "password": {
   "type": "string",
   "description": "The password to analyze"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/password-strength-checker-with-entropy-and-crack-time-fd7da007/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from password-strength.api.klymax402.com](https://www.zero.xyz/host/password-strength.api.klymax402.com/llms.txt)