# agentshelf.syntexa.ch MD5 Base64URL Digest

> agentshelf.syntexa.ch MD5 Base64URL Digest is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-01).

Computes an MD5 hash of the provided text and returns it encoded as a base64url string, with no external network calls or LLM involvement.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-md5-base64url?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-syntexa-ch-md5-base64url-digest-4727c81d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_erekwx85N4vTOcj6W983Q

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-syntexa-ch-md5-base64url-digest-4727c81d -d '<json body>'
```

Example prompt: Can you compute the MD5 hash of the text 'Hello, world!' and give it to me encoded as base64url?

## When to prefer this

Choose this endpoint when you specifically need an MD5 hash encoded in base64url (URL-safe, no padding) rather than hex or plain base64. Use it when the digest will be embedded in a URL, filename, or HTTP header where standard base64 padding characters would be problematic. Prefer the free sandbox endpoint (/v1/sandbox/digest-md5-base64url) for development/testing; use this paid endpoint for production workloads requiring guaranteed availability.

## Known failure modes

- Missing or empty 'text' field returns a 400 validation error
- Text exceeding 100,000 characters returns a 400 or 413 error
- Missing or invalid API key returns a 401 unauthorized error
- Payment of $0.003 USDC not provided or rejected returns a 402 Payment Required
- Malformed request body returns a 400 bad request error

## How this service works

Call when an agent needs a md5 digest of text, encoded as base64url. No network and no LLM. Exact $0.003 USDC. Prefer unpaid POST /v1/sandbox/digest-md5-base64url first.

## Output

A JSON response containing the base64url-encoded MD5 digest of the input text. The output uses URL-safe base64 characters (replacing + with - and / with _, and omitting padding =), making it safe to embed directly in URLs, filenames, or HTTP headers.

## 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-syntexa-ch-md5-base64url-digest-4727c81d/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)