# propeller.rocks Keccak256 Hash

> propeller.rocks Keccak256 Hash is a paid API for AI agents from propeller.rocks, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Computes the keccak256 hash of a UTF-8 string or hex-encoded byte string

## Facts

- Endpoint: GET https://propeller.rocks/keccak256
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/propeller-rocks-keccak256-hash-d1caf80f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fnf4Y_lOIQwGPr9Bkawxo

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 propeller-rocks-keccak256-hash-d1caf80f
```

Example prompt: Can you compute the keccak256 hash of the UTF-8 string 'Hello, World!'?

## When to prefer this

Use this endpoint when you need a keccak256 hash of a string or hex value — especially in Ethereum/EVM/Solidity contexts where keccak256 is the canonical hash function. Prefer this over SHA-256 or other hashes when working with smart contracts, ABI encoding, event topic0 computation, or any Ethereum-native cryptographic operation.

## Known failure modes

- Invalid or malformed hex input returns an error
- Empty input may return zero hash or error
- Network timeout for slow connections
- Payment failure if USDC balance insufficient

## How this service works

keccak256 hash of a utf8 or hex string

## Output

Returns the keccak256 hash (32-byte hex digest) of the provided UTF-8 or hex input string, suitable for use in Ethereum smart contracts, signature verification, or general cryptographic purposes.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/propeller-rocks-keccak256-hash-d1caf80f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from propeller.rocks](https://www.zero.xyz/host/propeller.rocks/llms.txt)