Transaction Simulation

The new standard

Transact with confidence. Preview how transactions will behave onchain, and keep your assets safe.

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Read the docs

Empower your users to transact with confidence

Actionable simulations

In 2022, more than $5B was lost in crypto scams. With transparent previews, Transaction Simulation ensures transactions will behave as users expect.

Save gas

Simulate a transaction and know if it will revert on chain ahead of time. No more wasting unnecessary gas.

Control your data

With three products, Asset Changes, Execution Simulation and Bundle Simulation, choose the type of transaction to simulate, and the format and granularity of the preview data.

Ergonomic access

Simulate any transaction with a single method. Compatible with the Alchemy SDK and available on Ethereum, Polygon, Arbitrum, Optimism and Base.

Educate your users

Malicious transactions are predicated on opaque smart contracts that most users don't understand. Users deserve predictability and clear previews, 100% of the time.

Complex inputs, simple outputs

Other simulation methods, e.g., debug_traceCall, have limited functionality with hard-to-parse outputs. Now, simulate complex transactions and get simple results, such as why transactions will fail and revert.

What you can do

"Alchemy handled the heavy lifting for us and saved us hundreds of hours of development time. Transaction Simulation allowed us to go-to-market 4 weeks faster!"

Kartik Patel

Former Head of Protocol, OpenSea

Explore more of our developer suite

Token API

Token balances and metadata

The token data your users expect, no token list required. Available on all EVM-supported chains.

Code preview

Copied

curl --request POST \
     --url https://eth-mainnet.g.alchemy.com/v2/docs-demo \
     --header 'accept: application/json' \
     --header 'content-type: application/json' \
     --data '
{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "alchemy_getTokenBalances",
  "params": [
    "0x95222290DD7278Aa3Ddd389Cc1E1d165CC4BAfe5",
    "erc20"
  ]
}
'

Transfers API

Portfolio management, simplified

100x faster than others. One request to get all historical transaction activity, including internal transfers.

Code preview

Copied

curl --request POST \
     --url https://eth-mainnet.g.alchemy.com/v2/docs-demo \
     --header 'accept: application/json' \
     --header 'content-type: application/json' \
     --data '
{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "alchemy_getAssetTransfers",
  "params": [
    {
      "fromBlock": "0x0",
      "toBlock": "latest",
      "toAddress": "0x5c43B1eD97e52d009611D89b74fA829FE4ac56b1",
      "withMetadata": false,
      "excludeZeroValue": true,
      "maxCount": "0x3e8"
    }
  ]
}
'

Transact

Cheaper, faster, safer transactions

7.9x faster, 100% success rate. Transaction simulation, frontrunning protection, and real-time notifications.

Code preview

Copied

curl --request POST \
     --url https://eth-mainnet.g.alchemy.com/v2/docs-demo \
     --header 'accept: application/json' \
     --header 'content-type: application/json' \
     --data '
{
  "method": "alchemy_sendGasOptimizedTransaction"
}
'

Build blockchain magic

Alchemy combines the most powerful web3 developer products and tools with resources, community and legendary support.

Get your API key