> For the complete Linea documentation index, see [llms.txt](/llms.txt). > Agents can fetch this page as Markdown at [https://docs.linea.build/network/build/tools/gas/blocknative.md](https://docs.linea.build/network/build/tools/gas/blocknative.md). # Blocknative Blocknative offers APIs to help developers and users estimate fees on Linea. The estimates are based on real-time Linea data and ML modeling to accurately and consistently estimate Linea transaction fees. Linea fee estimation is also available in the Blocknative [browser extension](https://blocknative.com/gas-extension). ## Use the Blocknative Gas API To leverage Blocknative's Gas API, you will need an [API Key](https://docs.blocknative.com/gas-prediction/gas-platform). Once you have an API key, you can request fee estimation for Linea: ```bash curl -H "Authorization: your-apikey-here" https://api.blocknative.com/gasprices/blockprices?chainid=59144 ```