# SignalDesk AI Password Search Space Calculator

> SignalDesk AI Password Search Space Calculator is a paid API for AI agents from x402-agent.kariguetoazul.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-10).

Computes the theoretical upper-bound entropy (in bits) and character pool size for a given password sample, without storing or evaluating the actual secret.

## Facts

- Endpoint: POST https://x402-agent.kariguetoazul.workers.dev/api/encoding/password-search-space?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signaldesk-ai-password-search-space-calculator-49cf8b79
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wqG_9U49unhTmMORWB0uJ

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 signaldesk-ai-password-search-space-calculator-49cf8b79 -d '<json body>'
```

Example prompt: Can you calculate the theoretical entropy and search space for a password like 'Tr0ub4dor&3' — I want to know how many bits of entropy it has and what character pool it assumes, without actually storing it?

## When to prefer this

Use this endpoint when you need a fast, cheap, mathematically grounded upper-bound entropy estimate for a password sample — particularly useful for policy checks, educational explanations, or automated audits. It does not check against breach databases or model human password patterns, so prefer a dedicated password-strength library (zxcvbn, etc.) if you need realistic crack-time estimates or dictionary-attack resistance scoring.

## Known failure modes

- Password string exceeds 256 characters — request rejected
- Empty or missing password field — likely returns error or zero entropy
- Payment of 0.001 USDC not completed — 402 Payment Required response
- Malformed JSON body — 400 Bad Request
- Sending a real production password is discouraged by the API's own warning

## How this service works

Evidence-backed autonomous AI jobs and paid data tools. Queue/D1/cron run outside the chat; free quotas and bounded execution apply.

## Output

Returns a JSON object with the password length, the assumed character pool size (e.g. 95 for full printable ASCII), an upper-bound entropy value in bits (computed as log2(pool^length)), and a warning that real human-chosen passwords are typically much weaker than the theoretical maximum.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "password": {
   "type": "string",
   "maxLength": 256,
   "description": "Sample password; do not send a real secret."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "length": 10,
  "warning": "Assumes uniform random independent characters; human passwords can be much weaker.",
  "assumed_pool": 95,
  "upper_bound_bits": 65.69855608330948
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signaldesk-ai-password-search-space-calculator-49cf8b79/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-agent.kariguetoazul.workers.dev](https://www.zero.xyz/host/x402-agent.kariguetoazul.workers.dev/llms.txt)