---
updatedAt: 2026-05-13T16:18:22.000Z
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Fetch the complete documentation index at: https://docs.blockdaemon.com/llms.txt. Use this file to discover all available pages before exploring further. Append .md to any documentation page URL to get its markdown version.

# Optimism

**Step 1:** To access Optimism, use the native access endpoint with `/http-rpc` at the end:

* **Network:** Optimism Mainnet
* **Request Type:** POST

```
https://svc.blockdaemon.com/optimism/mainnet/native/http-rpc
```

**Step 2:** Authenticate your request using your API key. You can include the API key using either of the following headers:

```curl Bearer Token
Authorization: Bearer YOUR_API_KEY
```

```curl X-API-Key
X-API-Key: YOUR_API_KEY
```

**Step 3:** Specify an Optimism method in the request body:

> Learn more about Optimism methods [here](https://docs.blockdaemon.com/reference/optimism-methods-rpc-api).

```json
{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "YOUR_METHOD",
    "params": []
}
```

### Example Request

Here is a cURL example for using **[eth\_blockNumber](https://ethereum.org/en/developers/docs/apis/json-rpc/#eth_blocknumber)** to get the current block number in Optimism Mainnet:

```curl
curl -X \
POST https://svc.blockdaemon.com/optimism/mainnet/native/http-rpc \
-H 'Authorization: Bearer YOUR_API_KEY' \
-H 'Content-Type: application/json' \
-d '{"jsonrpc": "2.0", "id": 1, "method": "eth_blockNumber", "params": []}'
```

The following is a typical response you will get:

```json
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": "0x17ba022"
}
```

## 👋 Need Help?

Contact us through [email](mailto:support@blockdaemon.com) or our [support page](https://www.blockdaemon.com/support) for any issues, bugs, or assistance you may need.