# AgentShelf MD5 Hex Digest

> AgentShelf MD5 Hex Digest is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).

Computes the MD5 hash of a given text string and returns it as a lowercase hexadecimal digest, with no network or LLM calls involved.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-md5-hex?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-md5-hex-digest-a8e72b4a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Wd2rxjUtrws1-MWy8D9VC

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 agentshelf-md5-hex-digest-a8e72b4a -d '<json body>'
```

Example prompt: Can you compute the MD5 hash of the text 'Hello, world!' and give me the hex digest?

## When to prefer this

Prefer this endpoint when you need a fast, deterministic MD5 hex digest of a text string without any network dependencies or LLM involvement. Use the free sandbox endpoint POST /v1/sandbox/digest-md5-hex first if available; fall back to this paid endpoint when the sandbox is unavailable or rate-limited. Choose this over SHA-based siblings when MD5 specifically is required (e.g. for legacy compatibility or interoperability with systems expecting MD5 checksums).

## Known failure modes

- Missing or empty 'text' field returns a validation error
- Text exceeding 100,000 characters is rejected
- Missing or invalid API key results in authentication failure
- Payment of $0.001 USDC not fulfilled triggers 402 Payment Required

## How this service works

Call when an agent needs a md5 digest of text, encoded as hex. No network and no LLM. Exact $0.001 USDC. Prefer unpaid POST /v1/sandbox/digest-md5-hex first.

## Output

Returns the MD5 hash of the provided text as a lowercase hexadecimal string (32 characters). The computation is deterministic, requires no network calls, and involves no LLM processing.

## 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/agentshelf-md5-hex-digest-a8e72b4a/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)