Bitquery Streaming Subscriptions

GraphQL subscriptions over WebSocket for real-time blockchain data - live DEX trades, transfers, pending transactions, contract events. Same V2 schema as the HTTP endpoint, delivered as push events. Supports both `graphql-ws` and `graphql-transport-ws` subprotocols, with OAuth token passed as `?token=` on the WebSocket URL. The legacy Early Access Program endpoint `wss://streaming.bitquery.io/eap` is still honored for existing customers.