Block Meta Subgraph

This subgraph indexes Ethereum blocks meta data using corresponding substream Allows you to query information like:

• What is the block at the start of day June 30th, 2022?
• What is the block at the end of July 2022?

Requirements

• Rust: curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
• Docker: https://docs.docker.com/desktop/
• The Graph CLI: npm i -g @graphprotocol/graph-cli
• Substreams CLI: https://substreams.streamingfast.io/getting-started/installing-the-cli

Indexing the subgraph locally

• Set env variables (generate $PINAX_KEY on https://pinax.network)

export SUBSTREAMS_ENDPOINT=https://eth-mar.firehose.pinax.network:9000
export SUBSTREAMS_API_TOKEN=$(curl https://auth.pinax.network/v1/auth/issue -s --data-binary '{"api_key":"'$PINAX_KEY'"}' | jq -r .token)
export ETH_MAINNET_RPC="http://eth-evmr73.mar.eosn.io:8080" # or another Ethereum RPC or EVMX endpoint

• Start graph node and wait until all 4 containers start up

cd graph-node
./up.sh     // script that starts docker containers needed to run graph node

• Now switch to another terminal and build and deploy substream and subgraph

make deploy_local

If everything went well you should see messages like Applying 3 entity operation(s), block_hash: 0xd4e56.... If not and you get ECONNRESET error, wait a bit more until graph-node fully starts up, and try again.

At that point you can open http://127.0.0.1:8000/subgraphs/name/block_meta/graphql and run a query like

query MyQuery {
  blockMetas(first: 5) {
    id
    hash
    number
    timestamp
  }
}