Chainlink Automation Service Limits
Maximum logs processed for log trigger upkeeps
Chainlink Automation nodes look back over a limited range of the latest blocks on any particular chain. During this process, the nodes process a limited number of logs per block per upkeep, using a minimum dequeue method to ensure that the latest logs are processed first. After this, the nodes may process additional remaining logs on a best effort basis, but this is not guaranteed. If you need all the remaining logs to be processed, configure a manual trigger as backup.
Expect the following numbers of logs to be processed:
| Chain | Logs per block per upkeep |
|---|---|
| Ethereum | 20 |
| BSC (BNB) | 4 |
| Polygon | 4 |
| Avalanche | 4 |
| Gnosis | 1 |
| Optimism | 4 |
| BASE | 4 |
| Arbitrum | 1 log every 2 blocks, or 2 logs per second |
Note: Log triggers are not supported on Fantom.