Since Denim, Base produces a canonical block every 200ms and Flashblocks are retired. The
"pending" tag is still accepted, but it no longer returns Flashblocks preconfirmation state. Use "latest" for the newest canonical block. See Migrate From Flashblocks.Parameters
string
required
Block number in hex, or
"latest", "pending", "safe", "finalized", "earliest".Returns
string
The number of transactions in the block as a hexadecimal integer.