While the manual web console is useful to explore blockchain data with GraphQL queries, how do you build analytics tools and back end which would consume their results?

You can automate with API calls with the same GraphQL queries as you tried in the console.

The development process may start with you designing queries in the GraphQL console, combining and refining them. Once you figured out how to collect all the data you need, you can incorporate these query calls into your DApp frontend.

Synchronous with http

Try this http call with queries for both the decoded and the raw block 100000. We use curl for demo to send this http POST, but any other http client either in the browser or on the back can do the same.

curl https://hasura.prod.summary.dev/v1/graphql --data-raw '{"query":"{starknet_goerli_block(where: {block_number: {_eq: 100000}}) { transactions { function entry_point_selector inputs { name type value } events { name transmitter_contract arguments { name type value decimal } } } } starknet_goerli_raw_block_by_pk(block_number: 100000) { raw }}"}'

Asynchronous with WebSocket

To get notified of changes to your query results use GraphQL subscriptions feature. It lets you connect via a WebSocket, pass your query as a subscription and your client will get called back once the results change. Use your favorite WebSocket or GraphQL client or our sample subscriber as a starting point to build web hooks that react to changes in blockchain data.

This example invocation of our subscriber reacts to the latest three events emitted.

npm start 'subscription {starknet_goerli_event(limit: 3, order_by: {id: desc}) {id, name}}'

The subscription query can be of any complexity required to get the data you're interested in, and deliver changes in an arbitrary collection of entities.