# Introducing Subsquid Firehose -- a lightweight decentralized data source for 40+ EVMs

**URL:** <https://forum.thegraph.com/t/introducing-subsquid-firehose-a-lightweight-decentralized-data-source-for-40-evms/4931>\
**Category:** Research & Development\
**Tags:** indexer, subgraph-devs\
**Created:** [December 6, 2023, 2:43pm UTC](https://forum.thegraph.com/t/introducing-subsquid-firehose-a-lightweight-decentralized-data-source-for-40-evms/4931 "2023-12-06T14:43:07Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![dzlzv](https://avatars.discourse-cdn.com/v4/letter/d/3ab097/32.png) [@dzlzv](https://forum.thegraph.com/u/dzlzv)\
**Post date:** [December 6, 2023, 2:43pm UTC](https://forum.thegraph.com/t/introducing-subsquid-firehose-a-lightweight-decentralized-data-source-for-40-evms/4931/1 "2023-12-06T14:43:07Z")

</div>

## Introducting Subsquid Firehose

Subsquid Firehose is a self-hosted  
ligthweight adapter that is run alongside a graph indexer node and has a interface compatible with Firehose. It efficiently  
sources on-chain data from Subsquid Network, so that there is no need to run  
a costly RPC archival node.

To run subgraphs with Subsquid Firehose, follow the instructions in [Subsquid docs](https://docs.subsquid.io/subgraphs-support/)

Subsquid Firehose addresses the following pain points:

- High maintainance costs of running an RPC infrastructure
- Unreliable and incosinstent data from the RPC endpoints, especially for smaller chains
- Trivial onboarding of new chains to the ecosystem – whatever is supported by Subsquid Network automatically becomes available for  
indexing, 40+ EVM networks are already supported out of the box

Subsquid Firehose guarantees the data consistency and significantly improves the indexing speed, while not sacrificing any  
decentralization:

- The adapter itself is self hosted, and can be run even on resource-constrained environments
- The heavy lifting of sourcing and serving the data is done by Subsquid Network, which is decentralized query engine and data lake  
for on-chain data.

## Known limitations

- The adapter is currently in beta, we invite everyone to try it out and give feedback.
- Subsquid Network serves only historical data, the last ~1000 real-time blocks are still source of an RPC endpoint. It still gives 95%+ savings  
on the RPC infrastructure
- Currently supports only event and call handlers. State calls are proxied to the RPC endpoints.

## About Subsquid Network

Subsquid Network is a distributed query engine and data lake. It supports queries against the historical  
events, transactions, traces and state-diffs served by a network of node in a peer-to-peer fashion. It is optimized for horizontal  
scalability and very low cost permissionless data access. More information can be found in the Whitepaper and the docs.

## About Subsquid Firehose

Subsquid Firehose is an opensource adapter that makes Subsquid Network compatible with the Firehose interface. The source code  
is available in this [repo](https://github.com/subsquid/firehose-grpc)

To run a subgraph with Subsquid Firehose, follow the instructions in the Subsquid Firehose docs

## Feedback

Please reach out for any feeback and suggestions to me directly on Telegram: @dzlzv