## Failed Fill Transactions

If the fill transaction fails you may get some useful data returned from the [requests api](https://docs.relay.link/references/api/get-requests):

- [failedTxHash](https://docs.relay.link/references/api/get-requests#response-requests-items-data-failed-tx-hash)
- [failedTxBlockNumber](https://docs.relay.link/references/api/get-requests#response-requests-items-data-failed-tx-block-number)
- [failedCalldata](https://docs.relay.link/references/api/get-requests#response-requests-items-data-failed-call-data)

You can use these values to simulate the transaction in [Tenderly](https://tenderly.co/) or similar tools to see the exact error message and revert reason.

### Step 1: Get the failed data

You can also access this data by going to the [Relay transaction page](https://www.relay.link/transaction/0x27714ec23ddd6466f383c77368692f948d7c52d320de03b371d0f310437bcb2a) and using the Ctrl + i shortcut to open up the full request data.

```bash
curl -X GET "https://api.relay.link/requests/v2?id=0x27714ec23ddd6466f383c77368692f948d7c52d320de03b371d0f310437bcb2a"
```

```
{
  "failedTxBlockNumber": 43159746,
  "failedCallData": {
    "from": "0xf70da97812CB96acDF810712Aa562db8dfA3dbEF",
    "to": "0xBBbfD134E9b44BfB5123898BA36b01dE7ab93d98",
    "data": "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
  }
}
```

### Step 2: Simulate the transaction in Tenderly

Open up your Tenderly dashboard, click simulator and then new simulation. Then paste in the required datapoints from the values above.

You should then see the simulation rendered in Tenderly with an in depth error message and where the revert happened.