RPC error -32601: robinhood_pendingBlock is not enabled

Last updated: October 24, 2026

At a glance

Cause

robinhood_pendingBlock is an operator-controlled extension, not a standard subscription. When it is disabled, eth_subscribe returns this JSON-RPC error. It is a changing snapshot of the block being assembled, and it is never a mempool or a finality signal.

Solution

1. Subscribe to newHeads for confirmed block headers, which is available from Basic tier.
2. Use the sequencer feed (Pro and above) when you need assembled L2 blocks with a resumable cursor.
3. If your use case genuinely needs pending-block snapshots, raise it with the operator — enabling it shares the newHeads budget.

Example

{
  "jsonrpc": "2.0",
  "id": 1,
  "error": {
    "code": -32601,
    "message": "robinhood_pendingBlock is not enabled"
  }
}