/v1/subgraph/gn

The SDK uses this as the default mainnet subgraph endpoint:

https://builder.prod.bedrock.ostium.io/v1/subgraph/gn

With testnet: true it reads Arbitrum Sepolia through the same endpoint:

https://builder.prod.bedrock.ostium.io/v1/subgraph/gn?chainId=421614

It backs read methods such as:

SDK configuration

Override the endpoint with subgraphUrl when creating the client.

const client = await OstiumClient.createReadOnly({
  subgraphUrl: 'https://your-subgraph.example.com/graphql',
});

For direct GraphQL usage, use the SDK reference pages as the response-shape source of truth for each read method.