# CRC-32 Checksum (Hex) via agent402.tools

> CRC-32 Checksum (Hex) via agent402.tools is a paid API for AI agents from agent402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Computes the CRC-32 checksum of a text string using the IEEE polynomial (used by ZIP, PNG, and gzip), returning the result as a hex string.

## Facts

- Endpoint: POST https://agent402.tools/api/crc32
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/crc-32-checksum-hex-via-agent402-tools-55c0ad1c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Ko3yDzJ5nrGCxCd38K6NI

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 crc-32-checksum-hex-via-agent402-tools-55c0ad1c -d '<json body>'
```

Example prompt: Can you compute the CRC-32 checksum of the text 'Hello, world!' and give me the hex result?

## When to prefer this

Use this endpoint when you need a fast, IEEE-standard CRC-32 checksum (the same variant used by ZIP, PNG, and gzip) of a text string without setting up a local library or runtime. Prefer it for lightweight data integrity checks, quick fingerprinting of text, or compatibility verification with file formats that rely on CRC-32.

## Known failure modes

- Missing or empty 'text' field returns a 400 or error response
- Payment failure (x402 protocol) results in a 402 Payment Required response
- Extremely large text strings may time out or be rejected
- Non-string input types may cause a validation error

## How this service works

CRC-32 checksum of a text string (hex), the IEEE polynomial used by zip/png/gzip.

## Output

Returns the CRC-32 checksum of the provided text as a hexadecimal string, computed using the standard IEEE polynomial — the same algorithm used by ZIP, PNG, and gzip formats.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "hex": "0d4a1185",
  "uint": 222957957
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/crc-32-checksum-hex-via-agent402-tools-55c0ad1c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent402.tools](https://www.zero.xyz/host/agent402.tools/llms.txt)