Core Subgraph using GraphQL

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Developers can use a self-hosted subgraph to extract data from the Core blockchain, processing and storing it for consumption via GraphQL. Let's take a look at how we can create and deploy this powerful tool.

Important URLs

We'll be using some standard URLs throughout this guide, which it’ll help to review before getting started.

MainNet

URL	Usage
Management URL: https://thegraph.coredao.org/deploy/	Used to create/deploy subgraphs (--node or -g).
IPFS URL: https://thegraph.coredao.org/ipfs/	Used to deploy subgraphs.
HTTP query URL: https://thegraph.coredao.org	Used to query data from subgraphs.
Health check URL https://thegraph-is.coredao.org	Used to check subgraph health.

TestNet

URL	Usage
Management URL: https://thegraph-node.test.btcs.network	Used to create/deploy subgraphs (--node or -g).
IPFS URL: https://thegraph-ipfs.test.btcs.network	Used to deploy subgraphs.
HTTP query URL: https://thegraph.test.btcs.network	Used to query data from subgraphs.
Health check URL https://thegraph-sub.test.btcs.network	Used to check subgraph health.

General Subgraph Setup Steps

Create Repository

To create your subgraph repository, follow the official guide from The Graph. In order to deploy onto the Core graph network, make sure to set your network name in subgraph.yaml to core. Depending on your subgraph, there may be a few more changes to make. You’ll find additional details in the full example section below.

Create and Deploy

To create and deploy your subgraph, execute the following commands in your subgraph project repository.

# Create subgraph
graph create your-subgraph-name --node https://thegraph.coredao.org/deploy/

# Deploy subgraph
graph deploy your-subgraph-name --node https://thegraph.coredao.org/deploy/ --ipfs https://thegraph.coredao.org/ipfs/

The graph deploy command should return the HTTP query URL for your subgraph, which you can integrate into your application as appropriate.

Example: Deploying a Uniswap V2 subgraph

Now that we understand the process, let's walk through a full example by setting up a Uniswap V2 subgraph on Core.

First, clone the Uniswap V2 subgraph repository, navigate to the project folder, then execute the following commands from that directory:

# Install dependencies with npm (or yarn)
npm install

# Generate subgraph code
npm run codegen

Now we'll make a few required changes to the subgraph.yaml and helpers.ts files:

• subgraph.yaml:
  • Change network name to core on lines 9 and 37.
  • Update the factory address on line 11.
  • Update the startBlock on line 13 to a reasonable block height (current block height available here).
• src/mappings/helpers.ts:
  • Update the factory address on line 11.

Finally, we'll run the create and deploy commands. In order to avoid compatibility issues, let's use the graph-cli installed in the project (instead of the global version) by prefixing the graph command with ./node_modules/.bin/.

# Create a new subgraph called uniswap-4-test
./node_modules/.bin/graph create uniswap-4-test --node https://thegraph.coredao.org/deploy/

# Deploy the uniswap-4-test subgraph
./node_modules/.bin/graph deploy uniswap-4-test --node https://thegraph.coredao.org/deploy/ --ipfs https://thegraph.coredao.org/ipfs/

# The deploy command should print an HTTP query URL similar to:
# https://thegraph.coredao.org/subgraphs/name/uniswap-4-test

Well done, your subgraph is deployed! Now you can integrate the HTTP query URL printed by the deploy command into your website and use it to query data.

Authorization

To prevent your subgraph from being overwritten by others, please contact us on discord for an authorization key.

If you are testing against the TestNet Graph, here is an access token for general testing purpose: a9a79c2aea604bfaa861ff93d46d0d11.