# CALLS_REVERTED

> Destination calls would revert: The destination calls of a quote failed their mandatory simulation, so no quote was returned.

Source: https://docs.layerhop.com/errors/CALLS_REVERTED

| HTTP status | Retry |
|---|---|
| `400` | no |

**Where it comes from:** `POST /v1/quote` with `calls` or `action` (destination calls).

## Causes

- A call reverts when run from the provider's executor with exactly `dstAmount` of the output token, for example it spends more than `dstAmount` or misses the ERC-20 `approve` call before it.
- The target contract rejects calls from the executor (it checks `msg.sender`, is paused, or a supply cap is reached).
- The calldata is for another chain or another contract version.

## How to fix

- Read the message: it names the failing call index, its target and the decoded revert reason.
- For ERC-20 outputs put `approve(target, dstAmount)` on the output token before the call that spends it, and spend at most `dstAmount`.
- Make the target credit `recipient` from a parameter, never `msg.sender` (see [Destination calls](/guides/destination-calls)).

## Example response

```json
{
  "error": {
    "code": "CALLS_REVERTED",
    "message": "{\n  \"error\": {\n    \"code\": \"CALLS_REVERTED\",\n    \"message\": \"Destination call 1 (to 0x794a61358d6845594f94dc1db02a252b5b4814ad) would revert: Error(ERC20: transfer amount exceeds balance)\",\n    \"requestId\": \"0d5e1f6a-…\",\n    \"docsUrl\": \"https://docs.layerhop.com/errors/CALLS_REVERTED\"\n  }\n}",
    "requestId": "0d5e1f6a-3b2c-4d1e-8f9a-7b6c5d4e3f21",
    "docsUrl": "https://docs.layerhop.com/errors/CALLS_REVERTED"
  }
}
```

See [Error handling & retries](/guides/error-handling) for a retry strategy, and the [error catalog](/errors) for every code.