> For the complete documentation index, see [llms.txt](https://docs.megaeth.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.megaeth.com/developer-docs/rpc/reference/eth_getblocktransactioncountbyhash.md).

# eth\_getBlockTransactionCountByHash

## Summary

Returns the number of transactions in the block matching the given hash.

The public MegaETH endpoint supports this method. The standard, node, and gateway layers below identify behavior that differs from a generic Ethereum endpoint.

## Parameters

**`blockHash`** Hash32 **REQUIRED**

Target block hash.

## Result

**`result`** Quantity | null

Transaction count; `null` when the block is not found.

## Comparison with Ethereum Standard JSON-RPC

### Ethereum Standard

The canonical Ethereum method uses the parameter and result contract documented above, including the stated `null`, `false`, or zero-value semantics where applicable.

### MegaETH Node Behavior

The node looks up the block and returns its transaction count. An unknown block produces `null`.

### MegaETH Public Gateway

The gateway caches successful hash-based lookups for 30 minutes in the simple read tier.

## Errors

The `| Scope |` column distinguishes method failures from gateway policy errors.

| Code     | Scope            | Message             | When it happens                                             |
| -------- | ---------------- | ------------------- | ----------------------------------------------------------- |
| `-32602` | Request          | Invalid params      | Block hash missing or malformed                             |
| `-32005` | Transport/policy | Rate limit exceeded | The caller exceeds the public gateway's simple read budget. |
| `-32099` | Transport/policy | Payload too large   | The request body exceeds the 128 KiB public endpoint limit. |

See also [Error Codes](/developer-docs/rpc/error-codes.md).

## Examples

Endpoint: `https://mainnet.megaeth.com/rpc`

Capture date: July 24, 2026

Outcome: success

```json
{
  "jsonrpc": "2.0",
  "id": 3,
  "method": "eth_getBlockTransactionCountByHash",
  "params": [
    "0xa97b8563203de36f0c8430709734438fbf7f2444b6de9f307853fc46b230de3e"
  ]
}
```

```json
{
  "jsonrpc": "2.0",
  "id": 3,
  "result": "0x18"
}
```

## Sources

* Spec: `git@github.com:ethereum/execution-apis.git @ d24f58b56dcd16ab0f0c70ec609bcc1c42750b51: src/eth/block.yaml`
* Code: `git@github.com:megaeth-labs/mega-reth.git @ ab60376631228edab3a6df180f295280bad26e93: crates/rpc/rpc-eth-api/src/core.rs`
* Code: `git@github.com:megaeth-labs/mega-rpc.git @ 06aa35aa95d569c227cc25d2aa12834eb0458aa0: workers/src/spec/methods.ts`
* Probe: MegaETH Mainnet public endpoint, July 24, 2026


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