StreamingFast
Blockchain data streaming and indexing infrastructure
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About StreamingFast
StreamingFast extracts and streams blockchain data through two components, Firehose and Substreams. Firehose writes blocks from nodes into flat files and pushes them instead of polling, raising historical throughput by an order of magnitude; Substreams runs parallel, composable modules on top, processing transactions, logs and state changes at once before writing to Postgres or feeding an application directly, with no sequential indexing. On high-throughput chains Firehose streams blocks and execution traces over gRPC, and Substreams modules can replay history in parallel or be recombined into new pipelines.
It is a core developer of The Graph, where both components are part of the indexing stack, and it runs its own indexer on Arbitrum serving the most demanding subgraphs. Customers are exchanges, wallets and analytics platforms that need low-latency full-chain data; the code is Apache 2.0, and revenue comes from hosted service and indexing rewards rather than software licences.
In April 2026 StreamingFast completed Base's migration to Reth, with all internal tests passing on Base Sepolia. The extended-block binary for Monad was finished and history reprocessing continued while the mainnet.monad.streamingfast.io endpoint stayed available. The same month brought further Substreams indexing speedups, lifting whole-chain backfill throughput again.
StreamingFast's product line is about writing less code. The team shipped a set of Substreams skills for AI coding assistants so that migrating a Subgraph or scaffolding a contract package becomes a guided task rather than a Rust project from scratch, cutting the move from weeks to hours. February added delta updates and S2 compression to the SQL sink, making rolling volume, count and min-max metrics cheaper to maintain. The trade-off between streaming and query-based indexing shows up in the cost curve: Substreams pushes compute to the client and keeps reproducible modules onchain, so repeated queries are not billed twice. The cost is that developers must understand module boundaries and state machines, which makes migration tooling a bigger adoption factor than raw speed.
StreamingFast will connect hosted sinks and stores to pay-as-you-go billing through The Graph market, keep pushing latency down, and onboard new chains straight into a streaming-first architecture.
Marc-Antoine Ross — Co-founder & CEO; serial entrepreneur, former Co-founder & CTO of PasswordBox and CEO of EOS Canada.
Alexandre Bourget — Co-founder & CTO; built PasswordBox's data stack and later served as Chief Data Scientist at Intel Security's consumer division.
Mathieu Boulianne — Co-founder & COO.
Richard Reiner — Co-founder & Executive Chair; serial entrepreneur and angel investor.