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EVM Transaction Simulation

About​

EVM Transaction Simulation lets you dry-run an EVM transaction from the Sign transaction modal and see whether it’s likely to succeed or revert — before you actually sign and send it.

When the feature is enabled in App Store, a Simulate button appears in the modal.

Sign modal with Simulate

Key features​

  • One-click simulate inside the signing modal
  • Re-Simulate to refresh against the latest chain state
  • Tenderly link with call trace, logs, gas usage, and state diff
  • Smart caching: identical payloads reuse the last result (use Re-Simulate to force a fresh run)

How to use​

1. Enable​

Enable EVM Transaction Simulation in App Store. App store EVM transaction simulation card

2. Open the signing modal​

Initiate any action that opens Sign transaction (Send, Swap, Staking, etc.).

3. Run a simulation​

Click Simulate. The modal updates with the result. You’ll see:

  • Status (e.g., Success or Failed / Reverted)
  • Simulation result → Link to view on Tenderly

Simulation result

4. Re-run if needed​

Click Re-Simulate to run it again against the current state.

5. Decide​

Sign if the outcome looks good, or Cancel and adjust.

Results explained​

Status​

Success if the simulated call didn’t revert and Failed if it did.

Opens Tenderly with full details: gas used, call trace, transfers, state diff, logs, and more.

Validation & tips​

  • Simulation is a best-effort preview, not a guarantee. Mempool reordering, state changes, MEV, price updates, or deadlines can still cause a real transaction to fail. If you change value, calldata, gas parameters, slippage, or recipient, simulate again.

Security & privacy​

  • We send public transaction fields only (from, to, value, data, gas params) to Tenderly to run the simulation.
  • Passwords, mnemonics, and private keys never leave the signer’s separate-origin iframe.
  • No simulation is broadcast to the network; it does not change on-chain state.

FAQ​

I don’t see the Simulate button — why?​

Make sure the EVM Transaction Simulation is enabled in App Store and that you’re on an EVM network. Simulation is currently disabled for non-EVM chains.

Does simulation send a real transaction?​

No. It’s an off-chain dry run. Nothing is broadcast.

Why can a simulated “Success” still fail on-chain?​

Between simulation and broadcast, the chain state (prices, pool liquidity, nonces, deadlines) can change, or the transaction can be reordered. Use Re-Simulate just before signing and pick sensible slippage/deadlines.

What gets stored or cached?​

For convenience, the result for the same payload is cached. Click Re-Simulate to force a fresh run.

Developer Info​

  • Built and maintained by the Extra Wallet team.
  • Source: Extra Wallet
  • Integration: Tenderly Simulation API for EVM previews