# Vextorium EVM Utils

> 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).

## Facts

- Endpoint: POST https://api.vextorium.com/v1/evm-utils?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vextorium-evm-utils-6a564993
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_o8_y-PGstWwAvWysW0beY

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 vextorium-evm-utils-6a564993 -d '<json body>'
```

Example prompt: Compute the 4-byte function selector for the Solidity signature 'transfer(address,uint256)' using the EVM utils.

## When to prefer this

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.

## Known failure modes

- 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

## 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).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "a": {
   "enum": [
    "wei",
    "gwei",
    "ether"
   ],
   "type": "string",
   "description": "Target unit for convertir"
  },
  "from": {
   "enum": [
    "wei",
    "gwei",
    "ether"
   ],
   "type": "string",
   "description": "Source unit for convertir"
  },
  "trade": {
   "enum": [
    "keccak256",
    "selector",
    "checksum",
    "convert"
   ],
   "type": "string",
   "description": "Operation"
  },
  "value": {
   "type": "string",
   "description": "Input value (text, hex, signature, address or number)"
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vextorium-evm-utils-6a564993/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.vextorium.com](https://www.zero.xyz/host/api.vextorium.com/llms.txt)