Submarine is an open source indexer and explorer, solving the polkadot ecosystems need for affordable and independantly operable chain visibility. Our goal is to lower onboarding costs for new projects and chains.

During a hands-on evaluation of open explorer scaffolds and other paths used for chain visibility across the ecosystem we identified two key issues:

slow, brittle catch-up due to poor performance
complexity in codebases that makes customization and ongoing maintenance difficult

These push many teams toward expensive hosted options rather than self-sovereign deployments.

Grantlevel

Level 1: Up to $10,000, 2 approvals
Level 2: Up to $30,000, 3 approvals
Level 3: Unlimited, 5 approvals (for >$100k: Web3 Foundation Council approval)

Application Checklist

Theapplication template has been copied and aptly renamed (project_name.md).
I have read theapplication guidelines.
Payment details have been provided (Polkadot AssetHub (USDC & DOT) address in the application and bank details via email, if applicable).
I understand that an agreed upon percentage of each milestone will be paid in vested DOT, to the Polkadot address listed in the application.
I am aware that, in order to receive a grant, I (and the entity I represent) have to successfully complete a KYC/KYB check.
The software delivered for this grant will be released under an open-source license specified in the application.
The initial PR contains only one commit (squash and force-push if needed).
The grant will only be announced once the first milestonehas been accepted (see theannouncement guidelines).
I prefer the discussion of this application to take place in a private Element/Matrix channel. My username is:@_______:matrix.org (change the homeserver if you use a different one)

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github-actionsbot commentedNov 3, 2025•
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CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

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Benjmhart commentedNov 3, 2025

I have read and hereby sign the Contributor License Agreement.

semuelle requested changes

Nov 3, 2025

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Thanks for the application,@Benjmhart. Please see my comments below.

submarine.md

Comment on lines +234 to +244

		- Total Estimated Duration: Duration of the whole project (e.g. 2 months)
		25 Weeks

		- Full-Time Equivalent (FTE): Average number of full-time employees working on the project throughout its duration (see [Wikipedia](https://en.wikipedia.org/wiki/Full-time_equivalent), e.g. 2 FTE)
		1.5 FTE

		- Total Costs: Requested amount in USD for the whole project (e.g. 12,000 USD). Note that the acceptance criteria and additional benefits vary depending on the [level](../README.md#level_slider-levels) of funding requested.
		$166,038 USD

		- DOT %: Percentage of Total Costs to be paid in (vested) DOT (≥ 50%)
		50%

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Suggested change

	-Total Estimated Duration: Duration of the whole project (e.g. 2 months)
	25 Weeks

	-Full-Time Equivalent (FTE): Average number of full-time employees working on the project throughout its duration (see[Wikipedia](https://en.wikipedia.org/wiki/Full-time_equivalent), e.g. 2 FTE)
	1.5 FTE

	-Total Costs: Requested amount in USD for the whole project (e.g. 12,000 USD). Note that the acceptance criteria and additional benefits vary depending on the[level](../README.md#level_slider-levels) of funding requested.
	$166,038 USD

	-DOT %: Percentage of Total Costs to be paid in (vested) DOT (≥ 50%)
	50%
	-Total Estimated Duration: 25 Weeks

	-Full-Time Equivalent (FTE): 1.5 FTE

	-Total Costs: $166,038 USD

	-DOT %: 50%

submarine.md

Comment on lines +262 to +285

		Number
		Deliverable
		Specification
		0a
		License
		Apache 2.0 / GPLv3 / MIT / Unlicense. See the delivery guidelines for details.
		0b
		Documentation
		We will provide both inline documentation of the code and a basic tutorial that explains how a user can (for example) spin up one of our Substrate nodes and send test transactions, which will show how the new functionality works. See the delivery guidelines for details.
		0c
		Testing and Testing Guide
		Core functions will be fully covered by comprehensive unit tests to ensure functionality and robustness. In the guide, we will describe how to run these tests. See the delivery guidelines for details.
		0d
		Docker
		We will provide a Dockerfile(s) that can be used to test all the functionality delivered with this milestone.
		1
		SCALE Parser
		Build a parser that consumes raw SCALE-encoded bytes and, using on-chain metadata, splits them into pallet-call indices and parameter payloads.
		2
		Metadata Fetching & Caching
		Auto-fetch latest on-chain metadata; Cache metadata versions based upon changes signified by specVersion or txVersionbumps.
		3
		Type Registry Generation
		Tooling to generate and version per-chain custom type registries; persist registries for historical lookups and re-decode.

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Please stick to the Markdown syntax provided in the application template. This is impossible to read.

submarine.md

Comment on lines +198 to +204

		If you've already started implementing your project or it is part of a larger repository, please provide a link and a description of the code here. In any case, please provide some documentation on the research and other work you have conducted before applying. This could be:

		- links to improvement proposals or [RFPs](https://grants.web3.foundation/docs/rfps) (requests for proposal),
		- academic publications relevant to the problem,
		- links to your research diary, blog posts, articles, forum discussions or open GitHub issues,
		- references to conversations you might have had related to this project with anyone from the Web3 Foundation,
		- previous interface iterations, such as mock-ups and wireframes.

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Please remove all the template text from the doc.

semuelle self-assigned this

Nov 3, 2025

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	-Total Estimated Duration: Duration of the whole project (e.g. 2 months)
	25 Weeks

	-Full-Time Equivalent (FTE): Average number of full-time employees working on the project throughout its duration (see[Wikipedia](https://en.wikipedia.org/wiki/Full-time_equivalent), e.g. 2 FTE)
	1.5 FTE

	-Total Costs: Requested amount in USD for the whole project (e.g. 12,000 USD). Note that the acceptance criteria and additional benefits vary depending on the[level](../README.md#level_slider-levels) of funding requested.
	$166,038 USD

	-DOT %: Percentage of Total Costs to be paid in (vested) DOT (≥ 50%)
	50%
	-Total Estimated Duration: 25 Weeks

	-Full-Time Equivalent (FTE): 1.5 FTE

	-Total Costs: $166,038 USD

	-DOT %: 50%

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Benjmhart commentedNov 3, 2025

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