The getMaxShredInsertSlot RPC method returns the highest slot number for which the queried RPC node has successfully received and processed (inserted) shreds. Shreds are the constituent parts of Solana blocks, propagated via Turbine. This value provides insight into how current the node is with the network’s block production from the perspective of data ingestion. Understanding this metric is useful for assessing a node’s ability to keep up with the rest of the network.

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Common Use Cases

  • Node Synchronization Status: Determine how up-to-date a specific node is by comparing its maxShredInsertSlot with the cluster’s latest slot. A significant lag can indicate that the node is falling behind in processing incoming block data.
  • Performance Monitoring: Track this value over time to monitor a node’s shred processing performance. Consistent or growing discrepancies relative to other nodes or the network tip might signal performance bottlenecks or connectivity problems.
  • Identifying Ingestion Issues: If a node reports a maxShredInsertSlot that isn’t advancing or is far behind other nodes, it could point to issues with its shred intake process, potentially related to network connectivity or local processing capacity.

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Request Parameters

This method does not take any parameters.

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Response Structure

The result field of the JSON-RPC response will be a u64 (unsigned 64-bit integer) representing the maximum slot for which the node has inserted shreds.

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Examples

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1. Get the Maximum Shred Insert Slot

This example fetches the maximum slot for which shreds have been inserted by the connected node. 
# Replace <api-key> with your Helius API key
curl https://mainnet.helius-rpc.com/?api-key=<api-key> -X POST -H "Content-Type: application/json" -d \
  '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "getMaxShredInsertSlot"
  }'

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Developer Tips

  • Node-Specific Value: The maxShredInsertSlot is particular to the RPC node being queried. Different nodes can have varying values at the same moment due to differences in network latency and processing speeds.
  • Indicator of Ingestion, Not Finality: This slot reflects the progress of shred ingestion by the node. It is not a measure of block finality. A slot might have its shreds inserted on one node but not yet be confirmed or finalized by the broader cluster. Use methods like getSlot with finalized commitment for finality checks.
  • Relationship with maxRetransmitSlot: Typically, maxShredInsertSlot will be less than or equal to maxRetransmitSlot. A node first sees shreds via retransmit and then processes and inserts them.
  • Constantly Updating: As the network produces new blocks and the node processes incoming shreds, this value will continuously increase.
By using getMaxShredInsertSlot, you can gain valuable insights into a Solana node’s progress in receiving and processing block data, which is essential for monitoring its health and synchronization with the network.