Keccak-256 hash

$0.003 per call · failed calls are never charged · no account or API key needed

Keccak-256 hash (the Ethereum hash) of text or of 0x hex bytes, as used for function selectors, event topics and storage slots. Use when building or decoding EVM calls.

Run it free (25 free calls) Buy credits by card (from $5) Example result (JSON)

Inputs

NameTypeDescription
text (required)stringText, or 0x-prefixed hex bytes, up to 10,000 characters

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://agent-data-tools.revmesh2074.workers.dev/keccak?text=transfer(address%2Cuint256)"

Or one of your 25 free calls, no key:

curl "https://agent-data-tools.revmesh2074.workers.dev/keccak?text=transfer(address%2Cuint256)&trial=1"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum, Monad, World Chain or Tempo) and retries.

Example result

{
  "input": "transfer(address,uint256)",
  "inputType": "text",
  "keccak256": "0xa9059cbb2ab09eb219583f4a59a5d0623ade346d962bcd4e46b11da047c9049b",
  "selector": "0xa9059cbb"
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is keccak, and the first 25 successful calls are free:

https://agent-data-tools.revmesh2074.workers.dev/mcp

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