TxSim Decoder | Apiosk Gateway

Base URL

https://gateway.apiosk.com/cbz-simulate-cyberwarex-com

Technical Specs

Auth MethodNone (x402 payment proof only)

Response FormatJSON

Endpoints1

Endpoints

Method	Path	Description	Cost
GET	/decode	Decode raw EVM calldata into a named function, signature and arguments, plus security risk flags (unlimited token approval, setApprovalForAll, ownership transfer, unknown selector, native value transfer). Keyless, deterministic, no simulation - the cheap way for an agent to understand and risk-screen a piece of calldata before signing.	$0.0023 default	View details

Endpoint documentation

GET/decode

$0.0023 default

Description

Decode raw EVM calldata into a named function, signature and arguments, plus security risk flags (unlimited token approval, setApprovalForAll, ownership transfer, unknown selector, native value transfer). Keyless, deterministic, no simulation - the cheap way for an agent to understand and risk-screen a piece of calldata before signing.

Pricing

$0.0023 default

Parameters

{
  "additionalProperties": false,
  "properties": {
    "data": {
      "description": "Transaction calldata (hex, 4-byte selector + ABI args).",
      "pattern": "^0x[a-fA-F0-9]*$",
      "type": "string"
    },
    "to": {
      "description": "Target address (optional, for context only).",
      "pattern": "^0x[a-fA-F0-9]{40}$",
      "type": "string"
    }
  },
  "required": [
    "data"
  ],
  "type": "object"
}

Example response

{
  "decoded": {
    "args": {
      "amount": "115792089237316195423570985008687907853269984665640564039457584007913129639935",
      "spender": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
    },
    "function": "approve",
    "signature": "approve(address,uint256)"
  },
  "disclaimer": "Static decode + keyless eth_call preview only. This is not financial advice and not a guarantee: a call that would succeed now can still revert at broadcast time (state changes, slippage, MEV). Always verify before signing.",
  "risk": {
    "flags": [
      {
        "code": "unlimited_approval",
        "detail": "approval amount is effectively unlimited",
        "severity": "danger"
      }
    ],
    "level": "danger"
  }
}