Agent Kiosk EVM Transaction Simulator & Pre-flight Safety Checker

x402

Agent Kiosk EVM Transaction Simulator & Pre-flight Safety Checker is a paid API for AI agents from agent-kiosk.vercel.app, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-19).

Simulates EVM transactions before broadcast, estimating gas, decoding revert reasons, checking ERC-20 allowances, and detecting EIP-1967 proxies across Base, Ethereum, Arbitrum, Optimism, and Polygon.

Price / call$0.005

Seller volume →—

Success—

StatusUnknown

How this service works

Pre-flight EVM Transaction Simulator, Gas Estimator, Revert Reason Decoder, ERC-20 Allowance Checker & EIP-1967 Proxy Detector across Base, Ethereum, Arbitrum, Optimism, and Polygon.

Output

Returns a JSON object with a safety verdict (e.g. SAFE_TO_BROADCAST), simulation results (will_revert boolean, estimated gas, gas price in gwei, estimated fee in USD), target contract metadata (address, is_contract, is_eip1967_proxy), and chain ID. Optionally includes ERC-20 allowance data if token and spender are provided.

Example use cases

Pre-flight DeFi swap safety check

“I'm about to call a Uniswap contract on Ethereum — can you simulate this transaction first and tell me if it'll revert, and what the gas cost will be in USD? From address is 0xMyWallet, to is 0xUniswapRouter, and calldata is 0xswapExactTokensForTokens...”

ERC-20 allowance verification before approval

“Check whether 0xSpenderContract already has enough allowance to spend my USDC tokens on Arbitrum — token address is 0xaf88d065e77c8cC2239327C5EDb3A432268e5831, my wallet is 0xMyAddress, and the spender is 0xSpenderContract.”

Revert reason decoding for failed transaction

“My transaction 0xabc123...def456 failed on Optimism — can you fetch the receipt and decode why it reverted so I know what went wrong?”

Technical details

Endpoint

POSThttps://agent-kiosk.vercel.app/v1/tx-simulate?utm_source=zero.xyz

When to prefer

Use this endpoint when you need to pre-flight check any EVM transaction before broadcasting it, especially for DeFi interactions where a revert would waste gas. Prefer this over raw RPC calls when you need a combined verdict covering gas estimation, revert detection, proxy detection, and allowance checking in a single call across multiple chains.

Side effects

Invalid or malformed contract address returns an error
Unsupported chain enum value rejected
Missing required 'to' or 'data' fields causes 400 error
Transaction simulation may fail if RPC node is congested or unavailable
EIP-1967 proxy detection may return false negative for non-standard proxy patterns
Payment failure (x402) if USDC balance is insufficient

Input

Schema · Request body

Field	Type	Description
to	string	0x target contract or recipient address
data	string	0x hex calldata to simulate via eth_call & eth_estimateGas
from	string	0x sender address
chain	string	Target EVM network (default: base)
token	string	Optional 0x ERC-20 token address to check allowance
value	string	Optional native ETH value in wei or 0x hex
spender	string	Optional 0x spender address to check ERC-20 allowance
tx_hash	string	Optional 0x transaction hash to fetch receipt

Output

Schema · Response

{
  "type": "json",
  "example": {
    "chain": "base",
    "verdict": "SAFE_TO_BROADCAST",
    "chain_id": 8453,
    "simulation": {
      "will_revert": false,
      "estimated_gas": 26410,
      "gas_price_gwei": 0.0061,
      "estimated_fee_usd": 0.0004
    },
    "target_contract": {
      "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "is_contract": true,
      "is_eip1967_proxy": true
    }
  }
}

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