ISHOB Transaction Simulator

x402

ISHOB Transaction Simulator is a paid API for AI agents from api.ishob.com, paid per call via x402, $0.0015/call, status unknown (last checked 2026-10-14).

Dry-run an EVM or Solana transaction to see balance changes, approvals, revert reasons, gas cost, and risk level — without broadcasting it

Price / call$0.0015

Seller volume →—

Success—

StatusUnknown

How this service works

Simulate a transaction before signing it: what leaves and enters the wallet (native, ERC-20, NFTs, SPL) with USD values, approvals granted (unlimited / to non-contracts), revert reason, gas and fee, plus a risk level. EVM chains via eth_simulateV1 (raw call: from, to, data, value); Solana via simulateTransaction (base64 transaction, unsigned is fine). Nothing is broadcast.

Output

A JSON object with success status, list of balance changes (token symbol, amount, direction, USD value), list of approvals granted (flagging unlimited or non-contract recipients), revert reason if the transaction would fail, gas used, and an overall risk level (low/medium/high) with any warnings.

Example use cases

DeFi swap safety check

“I'm about to do a Uniswap swap on Ethereum — can you simulate this transaction first and show me exactly how much ETH I'll spend, how much USDC I'll receive, and what the gas cost will be? From 0xMyWallet, to 0xUniswapRouter, calldata 0x…, value 10000000000000000 wei.”

Detect risky NFT approval

“Before I click confirm on this NFT marketplace approval, simulate the transaction on Polygon and flag if it grants unlimited token access to a non-contract address. From 0xMyAddress, to 0xMarketplaceContract, data 0x095ea7b3….”

Solana program interaction preview

“I have a base64-encoded Solana transaction for a Jupiter swap — can you simulate it without broadcasting and tell me which SPL tokens will move in and out of my wallet, the estimated fee, and whether the risk level is high?”

Technical details

Endpoint

POSThttps://api.ishob.com/v1/crypto/simulate-tx?utm_source=zero.xyz

When to prefer

Use this endpoint when an AI agent or user needs to preview the exact outcome of a blockchain transaction before committing — especially for DeFi interactions, NFT approvals, or unfamiliar contracts. It covers both EVM chains (Ethereum, Base, Arbitrum, Optimism, Polygon, BSC) and Solana in one call, returns USD-denominated values, and explicitly flags dangerous approval patterns and risk levels, making it superior to raw RPC simulation which provides no risk assessment or token USD values.

Side effects

Unsupported chain returns validation error
Malformed calldata hex causes simulation failure
Transaction would revert — revert reason returned in response
Missing required fields (from/to for EVM, transaction for Solana) returns 400
Network congestion on the simulated chain may cause timeout
Invalid base64 Solana transaction returns parse error

Input

Schema · Request body

Field	Type	Description
to	string	EVM: target address
gas	string	EVM: optional gas limit
data	string	EVM: calldata hex (default 0x)
from	string	EVM: sender address
chain	string
value	string	EVM: value in wei (decimal or 0x hex)
transaction	string	Solana: base64-encoded transaction (legacy or v0; signatures not required)

Output

Schema · Response

{
  "type": "json",
  "example": {
    "success": true,
    "gas_used": 276293,
    "warnings": [],
    "approvals": [],
    "risk_level": "low",
    "balance_changes": [
      {
        "usd": -24.9,
        "amount": "-0.01",
        "symbol": "ETH",
        "direction": "out"
      },
      {
        "usd": 24.89,
        "amount": "24.894345",
        "symbol": "USDC",
        "direction": "in"
      }
    ]
  }
}

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