# CRC16 Checksum (Decimal) Calculator

> CRC16 Checksum (Decimal) Calculator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-29).

Computes the CRC16 checksum of an input text string and returns the result as a decimal integer, with no network calls or LLM involved.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/checksum-crc16-dec?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/crc16-checksum-decimal-calculator-f8a02d1b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LtL-Pq0_lv-NiuYRt8LtM

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-checksum-decimal-calculator-f8a02d1b -d '<json body>'
```

Example prompt: Calculate the CRC16 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 a deterministic, fast, server-side CRC16 decimal checksum without implementing the algorithm locally. Especially useful in agentic pipelines where local computation is unavailable or undesirable, and where the exact $0.002 USDC per-call cost is acceptable. Try the free sandbox endpoint (POST /v1/sandbox/checksum-crc16-dec) first to validate behavior before paying.

## Known failure modes

- Empty or missing 'text' field returns a validation error
- Text exceeding 100,000 characters is rejected
- Missing or invalid API key returns 401/402 unauthorized
- Malformed JSON body returns a 400 bad request

## How this service works

Call when an agent needs a crc16 checksum of text as dec. No network and no LLM. Exact $0.002 USDC. Prefer unpaid POST /v1/sandbox/checksum-crc16-dec first.

## Output

Returns the CRC16 checksum of the provided text as a decimal integer. No network lookups or AI inference are involved; the result is deterministic and reproducible for any given input.

## 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-checksum-decimal-calculator-f8a02d1b/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)