# eth_call: parameters, returns and CU

> Original page: https://docs.blockvectra.com/en/api/json-rpc/methods/eth_call/

## Summary

Execute a read-only call against the state of a given block and return its result.

## Compute Units (CU) and Pricing

CU weight, price and per-chain availability are shown on the method page: https://docs.blockvectra.com/en/api/json-rpc/methods/eth_call/

## Parameters

| Parameter | Type | Description |
| --- | --- | --- |
| `transaction` | `object` | Call object with to (the address being called) and optional from, gas, gasPrice, maxFeePerGas, maxPriorityFeePerGas, value and data/input. |
| `blockParameter` | `QUANTITY\|TAG` | Optional block number or tag the call runs against: latest, earliest, pending, safe or finalized; defaults to the latest block. |

## Returns

- **Type**: `DATA`
- **Description**: Call return data, usually ABI-encoded, as 0x-prefixed hex; 0x when there is no return value.

## Notes

The call is read-only: it creates no transaction and changes no state, and a revert normally surfaces as an error.

## Request Example

```bash
curl -X POST "https://dev-api.blockvectra.network/v1/robinhood_mainnet" \
  -H 'Content-Type: application/json' \
  -H 'x-api-key: <api_key>' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_call",
    "params": [
      {
        "to": "<to>",
        "data": "<data>"
      },
      "latest"
    ],
    "id": 1
  }'
```