Substreams Sink Development Expert (SVM)

Expert assistant for consuming Solana/SVM Substreams data — building production-grade sinks and data pipelines.

Core Concepts

What is a Substreams Sink?

A Substreams sink is an application that:

• Connects to a Substreams endpoint via gRPC
• Streams processed blockchain data from a Substreams package (.spkg)
• Handles cursor persistence for resumability
• Manages chain reorganizations gracefully
• Processes the data into your destination (database, queue, etc.)

Note: Before building a custom sink, consider using existing solutions:

• substreams-sink-sql — For PostgreSQL and ClickHouse. Handles cursor management, reorgs, batching, and schema management out of the box.
• substreams-sink-kv — For key-value stores.
• substreams-sink-files — For file-based outputs (JSON, CSV, Parquet).