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POST
/
efb0a5eccd2caa5135eb54eba6f7f300
eth_syncing
curl --request POST \
  --url https://optimism-mainnet.core.chainstack.com/efb0a5eccd2caa5135eb54eba6f7f300 \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "method": "eth_syncing",
  "id": 1
}
'
{
  "jsonrpc": "<string>",
  "id": 123,
  "result": {
    "startingBlock": "<string>",
    "currentBlock": "<string>",
    "highestBlock": "<string>"
  }
}

Documentation Index

Fetch the complete documentation index at: https://docs.chainstack.com/llms.txt

Use this file to discover all available pages before exploring further.

Optimism API method eth_syncing checks if the node is currently syncing with the blockchain. It provides details about the sync progress if the node is syncing.
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​
Parameters

  • none — This method does not require any parameters.

​
Response

  • result — an object containing syncing details if the node is syncing; otherwise, false. The object includes:
    • startingBlock — the block number where the sync started.
    • currentBlock — the block number where the node is currently synced to.
    • highestBlock — the highest block number known in the chain that the node is syncing towards.
If the node is not syncing, the result will be false.

​
Use case

The eth_syncing method is useful for:
  • Monitoring tools and services that track the sync status of Optimism nodes.
  • Developers and users who want to check if a node is fully synced before making transactions or deploying contracts.

Body

application/json
​
jsonrpc
string
default:2.0
​
method
string
default:eth_syncing
​
id
integer
default:1

Response

200 - application/json

Syncing status of the node

​
jsonrpc
string
​
id
integer
​
result
object
Last modified on May 18, 2026