# SHA-512 Base64URL Digest

> SHA-512 Base64URL Digest is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.009/call, status unknown (last checked 2026-10-03).

Computes a SHA-512 cryptographic hash of input text and returns the result encoded as a base64url string.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-sha512-base64url?utm_source=zero.xyz
- Price: $0.009/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-03
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sha-512-base64url-digest-0636d3a7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_k4WbJyMVV51pgAbpk6wwV

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 sha-512-base64url-digest-0636d3a7 -d '<json body>'
```

Example prompt: Can you hash the text 'Hello, world!' using SHA-512 and give me the result as a base64url-encoded digest?

## When to prefer this

Use this endpoint when you need a SHA-512 digest specifically in base64url encoding (URL-safe, no padding) rather than hex or standard base64. Prefer it over computing hashes locally when operating in a sandboxed agent environment without access to cryptographic libraries. If cost is a concern, try the free sandbox endpoint POST /v1/sandbox/digest-sha512-base64url first. Choose SHA-512 over shorter variants (SHA-224, SHA-256) when maximum collision resistance is required.

## Known failure modes

- Empty or missing text field returns a validation error
- Text exceeding 100,000 characters is rejected
- Missing required fields return a 400 Bad Request
- Payment not provided or insufficient USDC results in a 402 Payment Required response

## How this service works

Call when an agent needs a sha512 digest of text, encoded as base64url. No network and no LLM. Exact $0.009 USDC. Prefer unpaid POST /v1/sandbox/digest-sha512-base64url first.

## Output

Returns a SHA-512 cryptographic hash of the input text, encoded as a base64url string (no padding characters, URL-safe alphabet). The digest is 86 characters long and deterministic for any given input.

## 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/sha-512-base64url-digest-0636d3a7/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)