FAQ
StreamingFast Substreams frequently asked questions
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StreamingFast Substreams frequently asked questions
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You can find answers to common Substreams questions in the FAQ documentation. If the answer you're looking for is not included through Discord to get help.
Substreams is an exceptionally powerful processing engine capable of consuming streams of rich blockchain data. Substreams refines and shapes the data for painless digestion by end-user applications, such as decentralized exchanges.
Developers do not need a dedicated installation of Firehose to use Substreams. StreamingFast provides a public Firehose endpoint made available to developers.
Yes, Substreams compliments and extend the capabilities and functionalities of subgraphs. Additional information is available in the .
Yes. Substreams is and used in production at multiple outlets.
Substreams is the name of the engine, and of the product. It is to be capitalized and kept plural. One can speak of an individual module or individual stream but in general, when speaking about the engine, you would use the word "Substreams".
substreams CLI?The substreams command line interface (CLI) is the main tool developers use to use the Substreams engine. The substreams CLI provides a range of features, commands, and flags. Additional information for the substreams CLI is available in the Substreams documentation.
Substreams and Firehose work together to index and process blockchain data. Substreams is used for transforming rich blockchain data and exposing it to the needs of application developers.
Yes, Substreams is an open-source project and there are free (albeit rate-limited) endpoints available.
Substreams is not meant to be piped to a web UI, it’s a data transformation layer. Substreams reaches Subgraphs, as a data source, and makes GraphQL available for web consumption. Other sinks might expose APIs for web browsers, however, it's not the responsibility of Substreams.
Specifying a stop block value of zero (0), the default enables transparent handoff from historical to real-time blocks.
StreamingFast was originally called dfuse. The company changed its name and is in the process of rebranding.
StreamingFast is a protocol infrastructure company providing a massively scalable architecture for streaming blockchain data. StreamingFast is one of the core developers working alongside The Graph Foundation.
wasm32-unknown-unknown target?The first unknown is the system you are compiling on, and the second is the system you are targeting.
“Compile on almost any machine, run on almost any machine.”
Check to make sure the module's output type matches the protobuf definition. In some cases, the renamed protobuf package isn't updated in the substreams.yaml manifest file's module.output.type field, creating an incompatibility.
No, it is currently NOT possible to retrieve Mempool data with Substreams.
Authentication tokens are required to use Substreams and connect to the public Firehose endpoint. Full are available in the Substreams documentation.
The StreamingFast team is related to obtaining or by using authentication tokens.
The Substreams documentation also tokens.
Developers create their own Substreams implementations in a variety of ways. Use these as a reference and starting point.
The Substreams documentation to assist you to understand and use Substreams.
Yes, .
Yes, .
Yes, .
Substreams is the successor of . Substreams enables greater composability, and provides similar parallelization capabilities. Sparkle is deprecated.
Additional information .