# CRC32C Checksum (Hex) — agentshelf.syntexa.ch

> CRC32C Checksum (Hex) — agentshelf.syntexa.ch is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.007/call, status unknown (last checked 2026-10-02).

Computes a CRC32C checksum of the provided text and returns it as a hexadecimal string, with no network calls or LLM involved.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/checksum-crc32c-hex?utm_source=zero.xyz
- Price: $0.007/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/crc32c-checksum-hex-agentshelf-syntexa-ch-b3580c31
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bj4AAqLOqGV_AjQE_vIq6

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 crc32c-checksum-hex-agentshelf-syntexa-ch-b3580c31 -d '<json body>'
```

Example prompt: Can you compute the CRC32C checksum of the text 'Hello, world! This is a test payload.' and give me the result as a hex string?

## When to prefer this

Choose this endpoint when you need a deterministic CRC32C checksum in hex format without relying on local libraries or runtime dependencies. It is ideal for agents operating in sandboxed environments without access to native hashing libraries, or when consistent cross-platform CRC32C computation is needed as a microservice call.

## Known failure modes

- Empty or missing 'text' field returns a validation error
- Text exceeding 100,000 characters is rejected
- Missing or invalid API key results in authentication failure
- Payment failure (insufficient USDC balance) blocks the request

## How this service works

Call when an agent needs a crc32c checksum of text as hex. No network and no LLM. Exact $0.007 USDC. Prefer unpaid POST /v1/sandbox/checksum-crc32c-hex first.

## Output

Returns a hexadecimal string representing the CRC32C checksum of the submitted text. The computation is done locally without any external network requests or AI model inference, ensuring deterministic and fast results.

## 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/crc32c-checksum-hex-agentshelf-syntexa-ch-b3580c31/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)