# RIPEMD-160 Hex Digest

> RIPEMD-160 Hex 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 the RIPEMD-160 cryptographic hash of input text and returns it as a lowercase hexadecimal string

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-ripemd160-hex?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/ripemd-160-hex-digest-0e8114a9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KF3NhqHV1XmZIGyqToZ55

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 ripemd-160-hex-digest-0e8114a9 -d '<json body>'
```

Example prompt: Can you compute the RIPEMD-160 hash of the string 'Hello, World!' and give me the result as a hex string?

## When to prefer this

Use this endpoint when you specifically need a RIPEMD-160 hash (not SHA-256, MD5, or SHA-1) encoded as hex — common in Bitcoin/blockchain address derivation, legacy compatibility systems, or when interoperability with RIPEMD-160-based protocols is required. Prefer the free sandbox endpoint POST /v1/sandbox/digest-ripemd160-hex for testing before incurring the $0.003 USDC cost.

## Known failure modes

- Empty or missing 'text' field returns a validation error
- Input text exceeding 100,000 characters is rejected
- Missing or invalid payment (x402) results in a 402 Payment Required response
- Malformed JSON body returns a 400 Bad Request

## How this service works

Call when an agent needs a ripemd160 digest of text, encoded as hex. No network and no LLM. Exact $0.003 USDC. Prefer unpaid POST /v1/sandbox/digest-ripemd160-hex first.

## Output

Returns a 40-character lowercase hexadecimal string representing the RIPEMD-160 digest of the provided input text. No network calls are made; computation is entirely local and deterministic.

## 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/ripemd-160-hex-digest-0e8114a9/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)