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EVM Transaction Simulator (eth_call)
x402
EVM Transaction Simulator (eth_call) is a paid API for AI agents from evm-tx-toolkit.mtree.workers.dev, paid per call via x402, $0.200000/call, status unknown (last checked 2026-10-11).
Simulates an arbitrary EVM call via eth_call on Base, Ethereum, Arbitrum, Optimism, or Polygon and returns success/revert status, decoded revert reason, return data, and gas estimate.
Price / call$0.200000
Success—
StatusUnknown
How this service works
Simulate an arbitrary EVM call with eth_call on Base, Ethereum, Arbitrum, Optimism, or Polygon and return success/revert status, decoded revert reason, return data, and gas estimate. Returns JSON. Price 0.20 USDC on Base via x402. Demo/preview: https://evm-tx-toolkit.mtree.workers.dev/demo/tx/simulate. Contact: https://evm-tx-toolkit.mtree.workers.dev/contact.
Output
A JSON object containing: success or revert status, decoded revert reason (if applicable), raw return data from the call, and a gas estimate for the operation.
Example use cases
Decode DeFi swap revert reason
“I tried to submit a token swap on Uniswap on Arbitrum but it keeps failing. Can you simulate this calldata — to: 0x68b3465833fb72A70ecDF485E0e4C7bD8665Fc45, from: 0xMyWallet, calldata: 0x5ae401d... — and tell me exactly why it's reverting?”
Pre-flight check Polygon contract call
“Before I broadcast this NFT mint transaction on Polygon, can you do a dry-run for me? The contract is 0xAbCd1234, my wallet is 0xMyAddress, and here's the calldata: 0x6a627842000... — will it go through, and how much gas should I expect?”
Validate token approval on Ethereum
“I want to approve a spending allowance for a DeFi protocol on Ethereum mainnet but I'm not sure if the call is set up correctly. Can you simulate it — to: 0xdAC17F958D2ee523a2206206994597C13D831ec7, from: 0xMyWallet, calldata: 0x095ea7b3... — and confirm it won't revert before I sign anything?”
Technical details
Endpoint
POSThttps://evm-tx-toolkit.mtree.workers.dev/v1/tx/simulate?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to pre-flight check any EVM smart contract call before broadcasting, especially to detect reverts, decode revert reasons, and get accurate gas estimates across Base, Ethereum, Arbitrum, Optimism, or Polygon — ideal for DeFi agents, wallet UIs, or any workflow requiring pre-signing safety validation.
Side effects
- Invalid calldata format — returns error with parsing details
- Unsupported chain specified — returns 400 with supported chain list
- RPC node timeout for the target chain — returns 503
- Malformed to/from address — returns 400 validation error
- Payment not included or insufficient — returns 402 payment required
- Call simulation itself reverts — returns 200 with revert status and decoded reason
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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