# AgentShelf Blake2s-256 Hex Digest (Raw Hex Input)

> AgentShelf Blake2s-256 Hex Digest (Raw Hex Input) is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.007/call, status unknown (last checked 2026-10-02).

Computes a keyed BLAKE2s-256 hash of raw hex-encoded bytes and returns the digest as a hex string.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-blake2s256-hex-rawhex?utm_source=zero.xyz
- Price: $0.007/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-blake2s-256-hex-digest-raw-hex-input-a374e0af
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1EGEZmXrmgqnVucdmBuuM

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-blake2s-256-hex-digest-raw-hex-input-a374e0af -d '<json body>'
```

Example prompt: Compute the BLAKE2s-256 digest of the hex bytes 'deadbeef0102030405' using the key 'mysecretkey' and give me the result as a hex string.

## When to prefer this

Choose this endpoint when you specifically need BLAKE2s-256 (not SHA-256 or BLAKE2b) over hex-encoded raw bytes with an optional key, and want the result as a hex string. Prefer the free sandbox endpoint (/v1/sandbox/digest-blake2s256-hex-rawhex) first; use this paid version when the sandbox is unavailable or rate-limited. Best for cryptographic integrity checks, keyed authentication tokens, or protocol-level checksums over binary data.

## Known failure modes

- Invalid hex input (non-hex characters in text field) returns an error
- Key exceeds 512 character limit returns validation error
- Input text exceeds 100,000 character limit returns payload-too-large error
- Malformed JSON body returns 400 bad request
- Payment not included or insufficient USDC causes 402 Payment Required

## How this service works

Call when an agent needs a blake2s256 digest of hex bytes, encoded as hex. Exact $0.007 USDC. Prefer unpaid POST /v1/sandbox/digest-blake2s256-hex-rawhex first.

## Output

A JSON response containing the BLAKE2s-256 hex-encoded digest of the provided hex-encoded input bytes, computed optionally with a provided key string.

## 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-blake2s-256-hex-digest-raw-hex-input-a374e0af/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)