Endpoint URLs

An API key generated on BaseScan ​ can be used across all mainnet and testnet explorers.

Similarly, all endpoints and parameter formatting remain the same across testnet explorers, you are only required to change the relevant API endpoint URL as follows.

Network	URL	Documentation
Mainnet	https://api.basescan.org/api	https://docs.basescan.org/
Sepolia	https://api-sepolia.basescan.org/api	https://docs.basescan.org/v/sepolia-basescan/
Goerli (Deprecating soon)	https://api-goerli.basescan.org/api	https://docs.basescan.org/v/goerli-basescan