Is there a fee for this service? how to pay
It will depend upon the usage. The free tier has a limit 100 000 calls and has a rate limit on API calls. To buy a bitquery subscription please follow the steps here: GraphQL Tutorials - Bitquery
Is there a fee for this service? how to pay
It will depend upon the usage. The free tier has a limit 100 000 calls and has a rate limit on API calls. To buy a bitquery subscription please follow the steps here: GraphQL Tutorials - Bitquery