Logs

The Event Log API was designed to provide an alternative to the native eth_getLogs.

Below are the list of supported filter parameters:

• fromBlock, toBlock, address

• topic0, topic1, topic2, topic3 (32 Bytes per topic)

• topic0_1_opr (and|or between topic0 & topic1), topic1_2_opr (and|or between topic1 & topic2), topic2_3_opr (and|or between topic2 & topic3), topic0_2_opr (and|or between topic0 & topic2), topic0_3_opr (and|or between topic0 & topic3), topic1_3_opr (and|or between topic1 & topic3)

Some parameters to take note of 📝

• FromBlock & ToBlock accepts the blocknumber (integer, NOT hex) or 'latest' (earliest & pending is NOT supported yet)

• Topic Operator (opr) choices are either 'and' or 'or' and are restricted to the above choices only

• FromBlock & ToBlock parameters are required

• An address and/or topic(X) parameters are required, when multiple topic(X) parameters are used the topicX_X_opr (and|or operator) is also required

For performance & security considerations, only the first 1000 results are return. So please narrow down the filter parameters.

Sample Log API Queries

Get Event Logs from block number 0 to latest, where log address = 0x61284008eccba03ebf84f5888c90dfaa23a00ae7 and topic[0] = 0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef

https://api-sepolia.basescan.org/api
   ?module=logs
   &action=getLogs
   &fromBlock=0
   &toBlock=latest
   &address=0x61284008eccba03ebf84f5888c90dfaa23a00ae7
   &topic0=0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef
   &apikey=YourApiKeyToken

Try this endpoint in your browser 🔗

Get Event Logs from block number 0 to block latest, where log address = 0x61284008eccba03ebf84f5888c90dfaa23a00ae7 , topic[0] = 0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef 'AND' topic[1] = 0x000000000000000000000000f13878b7da6a42833cc27eeb44e52c31329e4fd7

https://api-sepolia.basescan.org/api
   ?module=logs
   &action=getLogs
   &fromBlock=0
   &toBlock=latest
   &address=0x61284008eccba03ebf84f5888c90dfaa23a00ae7 
   &topic0=0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef 
   &topic0_1_opr=and
   &topic1=0x000000000000000000000000f13878b7da6a42833cc27eeb44e52c31329e4fd7
   &apikey=YourApiKeyToken

Try this endpoint in your browser 🔗