# CRC16-CCITT Checksum (Decimal) Calculator

> CRC16-CCITT Checksum (Decimal) Calculator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-02).

Computes the CRC16-CCITT checksum of input text and returns the result as a decimal integer.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/checksum-crc16-ccitt-dec?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/crc16-ccitt-checksum-decimal-calculator-eb9a5aba
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_T-CMHu6qT7yQNBoLwrErK

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 crc16-ccitt-checksum-decimal-calculator-eb9a5aba -d '<json body>'
```

Example prompt: Can you calculate the CRC16-CCITT checksum of the text 'Hello, World!' and give me the result as a decimal number?

## When to prefer this

Choose this endpoint when you need the CRC16-CCITT checksum variant specifically in decimal (base-10) format rather than hexadecimal. It is a pure computation endpoint with no external dependencies, making it deterministic and fast. If you need hex output or a different checksum algorithm (Adler32, CRC32C, Fletcher16), use the corresponding sibling endpoints on the same provider.

## Known failure modes

- Empty or missing text field returns a validation error
- Text exceeding 100,000 characters is rejected
- Invalid or missing API key results in authentication failure
- Malformed request body returns a 400 Bad Request error

## How this service works

Call when an agent needs a crc16-ccitt checksum of text as dec. No network and no LLM. Exact $0.004 USDC. Prefer unpaid POST /v1/sandbox/checksum-crc16-ccitt-dec first.

## Output

A decimal integer representing the CRC16-CCITT checksum of the provided text. No network calls or LLM inference are involved — the computation is deterministic and exact.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "key": {
   "type": "string",
   "maxLength": 512,
   "minLength": 1,
   "description": "HMAC secret. Required on HMAC SKUs. Omit it for plain digests and checksums. The key is not stored."
  },
  "text": {
   "type": "string",
   "examples": [
    "hello"
   ],
   "maxLength": 100000,
   "minLength": 1,
   "description": "Message to digest. For raw-hex SKUs this is hex bytes; for utf16 or latin1 SKUs it is decoded with that encoding. Otherwise it is UTF-8 text."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/crc16-ccitt-checksum-decimal-calculator-eb9a5aba/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentshelf.syntexa.ch](https://www.zero.xyz/host/agentshelf.syntexa.ch/llms.txt)