# BLAKE2b-512 Hex Digest of Raw Hex Bytes

> BLAKE2b-512 Hex Digest of Raw Hex Bytes is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02).

Computes a BLAKE2b-512 cryptographic digest of hex-encoded raw bytes input, returning the result as a hex string

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-blake2b512-hex-rawhex?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blake2b-512-hex-digest-of-raw-hex-bytes-a87d2f83
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_00rj0R9MhXPWSr50xFliL

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 blake2b-512-hex-digest-of-raw-hex-bytes-a87d2f83 -d '<json body>'
```

Example prompt: Compute a BLAKE2b-512 digest of the raw hex bytes 'deadbeef0102030405' and give me the result as a hex string.

## When to prefer this

Choose this endpoint when you need to hash raw binary data represented as hex bytes (not UTF-8 text) using BLAKE2b-512 with hex output. Use the free sandbox variant (/v1/sandbox/digest-blake2b512-hex-rawhex) first to avoid the $0.005 USDC cost. Prefer sibling endpoints if your input is plain text or if you need base64/base32 output encoding instead.

## Known failure modes

- Invalid hex input (odd-length or non-hex characters) causes a 400 error
- Key exceeds 512 characters causing validation failure
- Empty key or text fields (minLength:1 required) cause rejection
- Malformed JSON body results in parse error

## How this service works

Call when an agent needs a blake2b512 digest of hex bytes, encoded as hex. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/digest-blake2b512-hex-rawhex first.

## Output

A hex-encoded BLAKE2b-512 digest string (128 hex characters) representing the cryptographic hash of the provided hex-encoded raw bytes input, optionally keyed.

## 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/blake2b-512-hex-digest-of-raw-hex-bytes-a87d2f83/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)