FAQ

Dear Alchemy team, It seems that the API is not working correctly when I try to simulate the UserOperation. Here is the API response from the simulation: ``` [ { "assetType": "ERC20", "changeType": "TRANSFER", "from": "0x99d672d63bb316b495b6700827d6153bf8e540fb", "to": "0xeabcd21b75349c59a4177e10ed17fbf2955fe697", "rawAmount": "1500000000000000000", "contractAddress": "0xe8afce87993bd475faf2aea62e0b008dc27ab81a", "tokenId": null, "decimals": 18, "symbol": "STG TBIC", "name": "Staging Testing Beincom", "logo": null, "amount": "1.5" }, { "assetType": "ERC20", "changeType": "TRANSFER", "from": "0x99d672d63bb316b495b6700827d6153bf8e540fb", "to": "0xe8afce87993bd475faf2aea62e0b008dc27ab81a", "rawAmount": "32840591955959009", "contractAddress": "0xe8afce87993bd475faf2aea62e0b008dc27ab81a", "tokenId": null, "decimals": 18, "symbol": "STG TBIC", "name": "Staging Testing Beincom", "logo": null, "amount": "0.032840591955959009" } ] ``` The transaction emits the Transfer event for the ERC20 token with an amount of **0.032840591955959009**, but when I send UserOp, the actual amount is 20 times greater, and it's **0.658577643817952199** Is there any explanation for this discrepancy? Transaction hash: <https://sepolia.arbiscan.io/tx/0xe1a326d01e9b28709b68d2ed97528c93dee5e47de9bec5c8e633b640e46e07ea> Resources: API: <https://docs.alchemy.com/reference/alchemy-simulateuseroperationassetchanges> Network: Arbitrum-Sepolia Best regards, Khiêm

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Is there an API endpoint that can be called to get the number of compute units that I've used and/or the number of compute units remaining? Also, is there an endpoint to get recent billing invoices?

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We are an app looking to launch on upcoming Monad chain. We are interested in using the Alchemy AA toolkit but not sure whether you will support Monad on day 1 of launch?

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To determine whether a transaction is in the mempool, we use the get_transactionByHash method to check if the response is null. If the response is null, we assume the transaction has been dropped from the mempool and proceed to execute send_rawTransaction. However, we are encountering an issue where executing send_rawTransaction when get_transactionByHash returns a null response results in an "already known" error. Could it be that a null response from the get_transactionByHash method does not necessarily mean the transaction has been dropped from the mempool? Additionally, if there are other methods or best practices to determine whether a transaction is in the mempool, could you please provide that information? Your insights on this matter would be greatly appreciated. Thank you for your support. Best regards,

Do Alchemy subgraphs support call handlers and, if so, on which chains?