Get Estimated Block Countdown Time by BlockNo

https://api.routescan.io/v2/network/testnet/evm/ /etherscan/api
  ?module=block
  &action=getblockcountdown
  &blockno=16701588
  &apikey=YourApiKeyToken
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Query Parameters
Parameter
Description
blockno
the integer block number to estimate time remaining to be mined.

Get Block Number by Timestamp

https://api.routescan.iork/testnet/evm/ /etherscan/api
  ?module=block
  &action=getblocknobytime
  ×tamp=1619638524
  &closest=before
  &apikey=YourApiKeyToken
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Query Parameters
Parameter
Description
timestamp
the integer representing the Unix timestamp in seconds.
closest
the closest available block to the provided timestamp, either before or after
Due to large TX history, only chain data from October 1st onward will be indexed