# eth_newBlockFilter - Ethereum

Creates a filter in the node, to notify when a new block arrives.

To check if the state has changed, call [eth\_getFilterChanges](https://unifra.readme.io/reference/eth_getfilterchanges).

# Parameters

None

***

# Returns

QUANTITY - A filter id.

***

# Example

## Request

```curl
curl https://eth-mainnet.unifra.io/v1/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_newBlockFilter","params":[],"id":0}'
```
```Text Postman
URL: https://eth-mainnet.unifra.io/v1/your-api-key
RequestType: POST
Body:
{
    "jsonrpc":"2.0",
    "method":"eth_newBlockFilter",
    "params":[],
    "id":73
}
```

## Result

```json
{
	"jsonrpc": "2.0",
	"id": 0,
	"result": "0x9fb7f13924bb605fd29f3ddd6d193ece"
}
```

# OpenAPI definition

```json
{
  "openapi": "3.1.0",
  "info": {
    "title": "ethereum-api",
    "version": "1.0"
  },
  "servers": [
    {
      "url": "https://eth-mainnet.unifra.io/v1"
    }
  ],
  "security": [
    {}
  ],
  "paths": {
    "/{your-api-key}": {
      "post": {
        "summary": "web3_sha3 - Ethereum",
        "description": "Returns Keccak-256 (not the standardized SHA3-256) of the given data.",
        "operationId": "web3_sha3",
        "parameters": [
          {
            "name": "your-api-key",
            "in": "path",
            "schema": {
              "type": "string"
            },
            "required": true
          }
        ],
        "requestBody": {
          "content": {
            "application/json": {
              "schema": {
                "type": "object",
                "properties": {
                  "jsonrpc": {
                    "type": "string",
                    "default": "2.0"
                  },
                  "method": {
                    "type": "string",
                    "default": "web3_sha3"
                  },
                  "params": {
                    "type": "array",
                    "items": {
                      "type": "string"
                    }
                  },
                  "id": {
                    "type": "integer",
                    "default": 0,
                    "format": "int32"
                  }
                }
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "200",
            "content": {
              "application/json": {
                "examples": {
                  "Result": {
                    "value": "{}"
                  }
                },
                "schema": {
                  "type": "object",
                  "properties": {}
                }
              }
            }
          },
          "400": {
            "description": "400",
            "content": {
              "application/json": {
                "examples": {
                  "Result": {
                    "value": "{}"
                  }
                },
                "schema": {
                  "type": "object",
                  "properties": {}
                }
              }
            }
          }
        },
        "deprecated": false
      }
    }
  },
  "x-readme": {
    "headers": [],
    "explorer-enabled": true,
    "proxy-enabled": true
  },
  "x-readme-fauxas": true
}
```