# x402-toolbox Palindrome Check

> x402-toolbox Palindrome Check 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).

Checks whether a given string is a palindrome (reads the same forwards and backwards)

## Facts

- Endpoint: GET https://x402-toolbox.shablony-pro.workers.dev/text/palindrome-check?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-palindrome-check-135c50c3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_n-VO32J74uIENoZkVzv3E

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-palindrome-check-135c50c3
```

Example prompt: Can you check if the word 'racecar' is a palindrome?

## When to prefer this

Choose this endpoint when you need a cheap, deterministic, zero-signup palindrome check payable per-call via USDC on Base — ideal for AI agents that need string validation without managing API keys or subscriptions.

## Known failure modes

- Missing or empty string input returns an error or ambiguous result
- Payment failure over x402 (insufficient USDC balance or Base network issue) blocks the call
- Non-string or malformed schema parameter may yield unexpected behavior
- Case sensitivity handling may affect palindrome result if not normalized by the service

## 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

Returns a JSON object with an 'ok' boolean indicating request success, a 'paid' boolean confirming payment, and a result indicating whether the supplied string is a palindrome.

## 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-palindrome-check-135c50c3/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)