/v4/data/security/transaction/simulate

60000 credits per API call

Simulate a transaction against live chain state before signing or broadcasting it. The simulation returns balance movements, execution steps, and a risk assessment covering drainer patterns, suspicious approvals, delegatecalls, MEV exposure, and other threat heuristics.

Input modes — provide either:

• from (plus optional to, value, data, nonce, fees) — simulate an unsigned transaction, or
• rawTx — replay a signed, already-mined transaction. The transaction is

  looked up on-chain, so it must exist; to replay it accurately pass
  blockNumber = the block before it was mined.

Requests with neither from nor rawTx return 400.

RPC — ethereum-mainnet, bsc-mainnet, polygon-mainnet, and base-mainnet have built-in RPC support.

For any other supported chain, pass your own rpcUrl.

Other notes

• blockNumber and gasLimit are JSON numbers; value, nonce, and the fee fields are decimal or hex strings

  (values can exceed the safe JavaScript integer range).

• gasLimit defaults to 30,000,000 — lower it on chains with a smaller

  block gas limit (e.g. Gnosis).

• The risk summary (score, level, title, steps, warnings, risks) is returned at the top

  level of the response.