Hosted Services
Overview of the Substreams services StreamingFast hosts for you
Hosted Services are managed Substreams deployments that StreamingFast runs for you on The Graph Market. You configure a service in the portal; StreamingFast provisions the runners, keeps them online, and scales them. You do not operate the sink process or the store server yourself.
Hosted Services are currently in beta. To stay up to date, join our Discord and follow the #announcements channel.
There are two kinds of hosted service. Both are created from Hosted Services in The Graph Market — create a new service or list the ones you already have.
Hosted Sink
A Substreams sink that writes package output into a SQL database
A Postgres or ClickHouse database you already operate
Hosted Store
A block-aware key/value store, queryable over gRPC and from Substreams modules
Values to store — either you push them, or a Substreams package reads the chain and fills the store
Hosted Sink
A hosted sink continuously reads a Substreams package and writes the output into your Postgres or ClickHouse database. StreamingFast hosts the sink runner only. It does not create, host, or manage the database.
Use a hosted sink when you want SQL in a database you already run (or a managed one such as Supabase, Neon, or ClickHouse Cloud) without operating substreams-sink-sql yourself.
Supported engines are PostgreSQL and ClickHouse, in Database Changes Mode or Relational Mappings Mode. See Substreams:SQL.
The database must be reachable from StreamingFast's network (a public hostname, not localhost or a private Docker name).
How-to: Hosted Sinks — create a sink, connect Postgres or ClickHouse, then manage it. Walkthroughs: Supabase, Neon, ClickHouse Cloud.
If you would rather run the sink on your own infrastructure, see Consuming Substreams.
Hosted Store
A hosted store is a managed, block-aware key/value map. Keys are raw bytes; values are protobuf messages. Reads target a block height, so a Substreams module that queries the store stays in sync with the stream.
The create wizard offers two feed modes:
Remote feed
You (or another service) push and delete entries over gRPC with Feed.Set / Feed.Delete
Off-chain or application-owned data that Substreams should look up
Substreams feed
A Substreams package reads the chain and populates the store
On-chain lookups other modules should reuse (the same idea as a foundational store)
Once deployed, the store is reachable at <deployment-id>.hs.streamingfast.io:443 and is referenced from a Substreams manifest as foundational-store: <deployment-id>@<version>.
To run a foundational store yourself instead of using a StreamingFast-managed one, see Hosting a Foundational Store.
Create a service
Sign in to The Graph Market with an organization.
Open Hosted Services and click New Service.
Choose Sink or Hosted Store, then follow the wizard.
An API key is created automatically for each deployment. Manage keys at https://thegraph.market/api-keys.
Related resources
Hosted Sinks — managed SQL sinks
Remote Feed Hosted Store Guide — write, delete, and read a hosted store over gRPC
Substreams Feed Hosted Store Guide — populate a hosted store from a Substreams package
Foundational Stores — chain-specific stores populated by a Substreams package
Consuming Substreams — self-managed sinks (SQL, stream, PubSub, files, and community sinks)
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