# x402-toolbox Character Frequency Analyzer

> x402-toolbox Character Frequency Analyzer is a paid API for AI agents from x402-toolbox.shablony-pro.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).

Counts the frequency of each character in a given text string and returns a frequency map

## Facts

- Endpoint: GET https://x402-toolbox.shablony-pro.workers.dev/text/character-frequency?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-toolbox-character-frequency-analyzer-90803350
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7gh51vvoGdSLO6DgTFD_R

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 x402-toolbox-character-frequency-analyzer-90803350
```

Example prompt: Can you count how often each character appears in this string: 'Hello, World! How are you today?'

## When to prefer this

Choose this endpoint when you need a deterministic, pay-per-call character frequency computation with no API key or signup required. Ideal for AI agents operating autonomously with USDC on Base that need lightweight text analytics primitives. Prefer over heavier NLP APIs when you only need character-level statistics, not word or sentence analysis.

## Known failure modes

- Missing or empty input text returns an error or empty frequency map
- Invalid schema parameter format may result in a bad request response
- Payment failure via x402 returns HTTP 402 and the call is not executed
- Extremely long strings may hit Cloudflare Workers request size limits

## How this service works

309 deterministic pay-per-call tools for AI agents over x402 (USDC, Base). No signup, no API key: the payment is the identity.

## Output

A JSON object with ok:true and paid:true, along with a map of each character to the number of times it appears in the input text, allowing the agent to see the full frequency distribution of all characters.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "paid": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-toolbox-character-frequency-analyzer-90803350/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-toolbox.shablony-pro.workers.dev](https://www.zero.xyz/host/x402-toolbox.shablony-pro.workers.dev/llms.txt)