# agentshelf.syntexa.ch Blake2s-256 Base64url Digest (Hex Bytes)

> agentshelf.syntexa.ch Blake2s-256 Base64url Digest (Hex Bytes) is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-02).

Computes a BLAKE2s-256 digest of raw hex-encoded bytes and returns the result encoded as base64url

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-blake2s256-base64url-rawhex?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-syntexa-ch-blake2s-256-base64url-digest-hex-bytes-54275327
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Y7J5SHsS5HuTsXNFLiSd6

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-blake2s-256-base64url-digest-hex-bytes-54275327 -d '<json body>'
```

Example prompt: Can you compute the BLAKE2s-256 hash of the hex bytes 'deadbeef01234567' using the key 'mysecretkey' and give me the result as base64url?

## When to prefer this

Choose this endpoint when you specifically need a BLAKE2s-256 hash of raw binary data supplied as hex, with the output in base64url format, and the free sandbox endpoint (/v1/sandbox/digest-blake2s256-base64url-rawhex) is unavailable or rate-limited. Prefer it over SHA-family hashing endpoints when BLAKE2s speed and compactness matter, and over generic base64 encoding endpoints when a cryptographic digest is required.

## Known failure modes

- Invalid hex string input (odd-length or non-hex characters) causing a 4xx error
- Key exceeds maximum length of 512 characters resulting in a validation error
- Text field exceeds 100,000 character limit causing rejection
- Network timeout or 5xx server error during computation
- Payment failure or insufficient USDC balance causing a 402 response

## How this service works

Call when an agent needs a blake2s256 digest of hex bytes, encoded as base64url. Exact $0.003 USDC. Prefer unpaid POST /v1/sandbox/digest-blake2s256-base64url-rawhex first.

## Output

A base64url-encoded BLAKE2s-256 digest string computed over the raw bytes represented by the provided hex input, optionally keyed if a key is supplied.

## 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": [
    "68656c6c6f"
   ],
   "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-blake2s-256-base64url-digest-hex-bytes-54275327/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)