# AgentBIT Keccak-256 Hash

> AgentBIT Keccak-256 Hash is a paid API for AI agents from agentbit.app, paid per call via x402, $0.0015/call, status unknown (last checked 2026-10-02).

Computes the Keccak-256 cryptographic hash of an input string, returning the hex digest used in Ethereum and other EVM-based systems.

## Facts

- Endpoint: POST https://agentbit.app/v1/hash/keccak256?utm_source=zero.xyz
- Price: $0.0015/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentbit-keccak-256-hash-9e31e8a9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WwiXvMeyqmSXqkhaEsVoC

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 agentbit-keccak-256-hash-9e31e8a9 -d '<json body>'
```

Example prompt: Compute the Keccak-256 hash of the string 'transfer(address,uint256)' so I can use it as an Ethereum function selector.

## When to prefer this

Choose this endpoint when you need a Keccak-256 hash (the Ethereum-native variant, not SHA-3) without standing up your own crypto library or managing API keys — ideal for AI agents building EVM transactions, computing function selectors, generating event topic hashes, or creating Merkle tree leaves on a pay-per-call basis.

## Known failure modes

- Missing or empty 'input' field returns a validation error
- Non-string input types may cause a 400 bad request
- Network or payment failure returns a 402 or 5xx error
- Extremely large input strings may time out or be rejected

## How this service works

Ethereum Keccak-256 hex digest of input — original Keccak (0x01 padding), not NIST SHA3-256. Used for EVM checksums, event topics and Solidity keccak256.

## Output

Returns a JSON object containing the Keccak-256 hex digest (64 hex characters, 32 bytes) of the provided input string, suitable for use in Ethereum smart contracts, EVM tooling, EIP-712 signatures, and other blockchain applications.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "input": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {}
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentbit-keccak-256-hash-9e31e8a9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentbit.app](https://www.zero.xyz/host/agentbit.app/llms.txt)