# Eth\_getUncleCountByBlockNumber

## Get the number of uncle blocks by block number

> Sends a JSON-RPC request to retrieve the number of uncle blocks for a given block number. \
> Returns the count encoded as a hexadecimal string.<br>

```json
{"openapi":"3.0.0","info":{"title":"Ethereum JSON-RPC","version":"1.0.0"},"servers":[{"url":"https://arbitrum.nownodes.io"}],"security":[{"api-keyAuth":[]}],"components":{"securitySchemes":{"api-keyAuth":{"type":"apiKey","in":"header","name":"api-key"}}},"paths":{"/":{"post":{"tags":["eth_getUncleCountByBlockNumber"],"summary":"Get the number of uncle blocks by block number","operationId":"ethGetUncleCountByBlockNumber","description":"Sends a JSON-RPC request to retrieve the number of uncle blocks for a given block number. \nReturns the count encoded as a hexadecimal string.\n","requestBody":{"required":true,"content":{"application/json":{"schema":{"type":"object","required":["jsonrpc","method","params","id"],"properties":{"jsonrpc":{"type":"string"},"method":{"type":"string"},"params":{"type":"array","minItems":1,"maxItems":1,"description":"An array containing the block number as a hex string","items":{"type":"string","description":"The block number to query, expressed as a hex string prefixed with `0x`. \nSpecial strings \"latest\", \"earliest\", or \"pending\" are also accepted.\n"}},"id":{"type":"integer"}}}}}},"responses":{"200":{"description":"Number of uncle blocks in the block","content":{"application/json":{"schema":{"type":"object","properties":{"jsonrpc":{"type":"string"},"id":{"type":"integer"},"result":{"type":"string","description":"The number of uncle blocks as a hex string (e.g., \"0x0\" for zero uncles)"}}}}}}}}}}}
```