Vextorium EVM Utils

x402

Vextorium EVM Utils is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-15).

Performs EVM/Solidity utility operations: keccak256 hashing, function selector computation, EIP-55 checksum address formatting, and Ether unit conversion (wei/gwei/ether).

Price / call$0.003

Seller volume →—

Success—

StatusUnknown

How this service works

EVM developer utilities: keccak256 hash, function selector from a signature, EIP-55 checksum address and wei/gwei/ether conversion.

Output

Returns a JSON object with three fields: 'input' (the original value you submitted), 'trade' (the operation performed, e.g. 'selector', 'keccak256', 'checksum', or 'convert'), and 'result' (the computed output — a hex string, checksummed address, or numeric value depending on the operation).

Example use cases

Function selector for smart contract call

“What's the 4-byte function selector for the Solidity function signature 'approve(address,uint256)'? I need it to build a raw EVM transaction.”

Convert wei amount to ether

“Convert 1500000000000000000 wei to ether so I can display it in a human-readable format.”

Checksum an Ethereum address

“Can you apply EIP-55 checksum formatting to the Ethereum address '0xd8da6bf26964af9d7eed9e03e53415d37aa96045' so it's properly capitalised?”

Technical details

Endpoint

POSThttps://api.vextorium.com/v1/evm-utils?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need quick, serverless EVM/Solidity utility computations without running a local Ethereum node — specifically for hashing arbitrary data with keccak256, deriving Solidity function selectors from ABI signatures, normalising Ethereum addresses to EIP-55 checksum format, or converting between wei, gwei, and ether units. It is pay-per-call via USDC (x402) so there is no subscription overhead, making it ideal for on-demand agent workflows.

Side effects

Invalid or malformed input value for the chosen operation (e.g. non-hex string for checksum)
Missing required 'from'/'a' unit fields when using the 'convert' operation
Unsupported 'trade' enum value causing validation error
Network or upstream service timeout returning a 5xx error
Malformed JSON body causing a 400 Bad Request

Input

Schema · Request body

Field	Type	Description
a	string	Target unit for convertir
from	string	Source unit for convertir
trade	string	Operation
value	string	Input value (text, hex, signature, address or number)

Output

Schema · Response

{
  "type": "json",
  "example": {
    "input": "transfer(address,uint256)",
    "trade": "selector",
    "result": "0xa9059cbb"
  }
}

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