80 Compute Units.
Reference: Here
Parameters
Object- The filter options:
fromBlock:QUANTITY|TAG- (optional, default:"latest") Integer block number, or"latest"for the last mined block"pending"for the pending block, or"earliest"for the genesis block.toBlock:QUANTITY|TAG- (optional, default:"latest") Integer block number, or"latest"for the last mined block"pending"for the pending block, or"earliest"for the genesis block.address:DATA|Array, 20 Bytes - (optional) Contract address or a list of addresses from which logs should originate.topics:Array of DATA, - (optional) Array of 32 BytesDATAtopics. Topics are order-dependent. Each topic can also be an array of DATA with βorβ options.blockHash:DATA, 32 Bytes - (optional, future) With the addition of EIP-234,blockHashwill be a new filter option which restricts the logs returned to the single block with the 32-byte hashblockHash. UsingblockHashis equivalent tofromBlock=toBlock= the block number with hashblockHash. IfblockHashis present in in the filter criteria, then neitherfromBlocknortoBlockare allowed.
Returns
See eth_getFilterChanges:Array - Array of log objects matching the filter, or an empty array if none match. Each log object has the following fields:
removed:TAG-truewhen the log was removed, due to a chain reorganization.falseif its a valid log.logIndex:QUANTITY- integer of the log index position in the block.nullwhen its pending log.transactionIndex:QUANTITY- integer of the transactions index position log was created from.nullwhen its pending log.transactionHash:DATA, 32 Bytes - hash of the transactions this log was created from.nullwhen its pending log.blockHash:DATA, 32 Bytes - hash of the block where this log was in.nullwhen its pending.nullwhen its pending log.blockNumber:QUANTITY- the block number where this log was in.nullwhen its pending.nullwhen its pending log.address:DATA, 20 Bytes - address from which this log originated.data:DATA- contains one or more 32 Bytes non-indexed arguments of the log.topics:Array of DATA- Array of 0 to 4 32 BytesDATAof indexed log arguments. (In solidity: The first topic is the hash of the signature of the event (e.g.Deposit(address,bytes32,uint256)), except you declared the event with theanonymousspecifier.)