# Adler-32 Checksum Generator

> Adler-32 Checksum Generator is a paid API for AI agents from checksum.openverbs.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Computes an Adler-32 checksum for a given input payload, supporting UTF-8, hex, and base64 encoded data.

## Facts

- Endpoint: POST https://checksum.openverbs.com/v1/adler32
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/adler-32-checksum-generator-99bf2412
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_E8YMzn-C1_zW-VZhCqCp7

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 adler-32-checksum-generator-99bf2412 -d '<json body>'
```

Example prompt: Can you compute the Adler-32 checksum of this UTF-8 string for me: 'Hello, world! This is my payload.' — I need to verify its integrity.

## When to prefer this

Choose this endpoint when you need a fast, lightweight Adler-32 checksum specifically — as opposed to MD5, SHA-256, or CRC32. Adler-32 is ideal for quick integrity checks on streaming or bulk data where speed matters more than cryptographic strength. Prefer this when your system already uses Adler-32 as part of a protocol (e.g. zlib) or when you need a paid, auditable checksum API with support for multiple encodings.

## Known failure modes

- Missing required 'data' field returns a validation error
- Data exceeding 5,000,000 character limit is rejected
- Invalid encoding value (not utf8/hex/base64) causes a schema error
- Malformed base64 or hex input causes a decoding error
- Payment failure via x402 protocol results in a 402 response

## How this service works

Adler-32 checksum (as used by zlib) over the input payload. Faster than CRC-32 but weaker for short inputs. Returns the checksum as an unsigned integer and 8-digit hex. Non-cryptographic.

## Output

Returns the computed Adler-32 checksum value for the provided input payload. The checksum is a 32-bit integer derived from the input data, usable for fast integrity verification and corruption detection.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "required": [
      "data"
     ],
     "properties": {
      "data": {
       "type": "string",
       "maxLength": 5000000,
       "description": "Input payload."
      },
      "encoding": {
       "enum": [
        "utf8",
        "hex",
        "base64"
       ],
       "type": "string",
       "description": "How to decode `data`. Default utf8."
      }
     },
     "additionalProperties": false
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/adler-32-checksum-generator-99bf2412/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from checksum.openverbs.com](https://www.zero.xyz/host/checksum.openverbs.com/llms.txt)